Journal articles on the topic 'Underwater cities'

Nowadays, there is a growing trend in smart cities. Therefore, Terrestrial and Internet of Things (IoT) enabled Underwater Wireless Sensor Networks (TWSNs and IoT-UWSNs) are mostly used for observing and communicating via smart technologies. For the sake of collecting the desired information from the underwater environment, multiple acoustic sensors are deployed with limited resources, such as memory, battery, processing power, transmission range, etc. The replacement of resources for a particular node is not feasible due to the harsh underwater environment. Thus, the resources held by the node needs to be used efficiently to improve the lifetime of a network. In this paper, to support smart city vision, a terrestrial based “Away Cluster Head with Adaptive Clustering Habit” (ACH) 2 is examined in the specified three dimensional (3-D) region inside the water. Three different cases are considered, which are: single sink at the water surface, multiple sinks at water surface,, and sinks at both water surface and inside water. “Underwater (ACH) 2 ” (U-(ACH) 2 ) is evaluated in each case. We have used depth in our proposed U-(ACH) 2 to examine the performance of (ACH) 2 in the ocean environment. Moreover, a comparative analysis is performed with state of the art routing protocols, including: Depth-based Routing (DBR) and Energy Efficient Depth-based Routing (EEDBR) protocol. Among all of the scenarios followed by case 1 and case 3, the number of packets sent and received at sink node are maximum using DEEC-(ACH) 2 protocol. The packets drop ratio using TEEN-(ACH) 2 protocol is less when compared to other algorithms in all scenarios. Whereas, for dead nodes DEEC-(ACH) 2 , LEACH-(ACH) 2 , and SEP-(ACH) 2 protocols’ performance is different for every considered scenario. The simulation results shows that the proposed protocols outperform the existing ones.

Modern underwater remote sensing technology introduces many advantages that extend the range of conventional diving work providing the means to survey in a detailed and systematic fashion large seafloor area. There are two general approaches regarding the application of these techniques in underwater archaeology; they are being increasingly used to identify, locate and map (i) ancient and historical shipwrecks lying on the seafloor or partly buried in it and (ii) the coastal palaeogeogra-phy and thus submerged sites of archaeological interest (submerged ancient cities, settlements, ports and man-made structures). The underwater remote sensing techniques most commonly applied to underwater archaeology employ: (i) single and multi-beam echosounders (ii) side scan sonar (acousting imaging), (iii) laser line scan (optical imaging) (iv) subbottom profiler, (v) marine magne-tometer and (vi) undersea vehicles. The objectives of this paper are twofold: (i) to present the results of remote sensing surveys that carried out at sites of archaeological and historical interest, in Greece (Dokos Island, ancient harbour of Kyllene and Navarino Bay whereas a historical naval Battle took place) and in Eastern Mediterranean Sea (Alexandria Egypt and Mazotos shipwreck Cyprus), and (ii) to prove the applicability of remote sensing techniques in underwater archaeology showing that a combination of these can be a very effective tool.

Nowadays, there is a growing trend in smart cities. Therefore, the Internet of Things (IoT) enabled Underwater and Wireless Sensor Networks (I-UWSN) are mostly used for monitoring and exploring the environment with the help of smart technology, such as smart cities. The acoustic medium is used in underwater communication and radio frequency is mostly used for wireless sensor networks to make communication more reliable. Therefore, some challenging tasks still exist in I-UWSN, i.e., selection of multiple nodes’ reliable paths towards the sink nodes; and efficient topology of the network. In this research, the novel routing protocol, namely Time Based Reliable Link (TBRL), for dynamic topology is proposed to support smart city. TBRL works in three phases. In the first phase, it discovers the topology of each node in network area using a topology discovery algorithm. In the second phase, the reliability of each established link has been determined while using two nodes reliable model for a smart environment. This reliability model reduces the chances of horizontal and higher depth level communication between nodes and selects next reliable forwarders. In the third phase, all paths are examined and the most reliable path is selected to send data packets. TBRL is simulated with the help of a network simulator tool (NS-2 AquaSim). The TBRL is compared with other well known routing protocols, i.e., Depth Based Routing (DBR) and Reliable Energy-efficient Routing Protocol (R-ERP2R), to check the performance in terms of end to end delay, packet delivery ratio, and energy consumption of a network. Furthermore, the reliability of TBRL is compared with 2H-ACK and 3H-RM. The simulation results proved that TBRL performs approximately 15% better as compared to DBR and 10% better as compared to R-ERP2R in terms of aforementioned performance metrics.

In the Mediterranean area, there are hundreds of ancient cities that have ceased to exist, and millions of valuable parts of buildings and sculptures remain hidden or abandoned. This resource requires special care and protection. There is probably a much larger part of this resource, as yet unexposed to view, remaining to be discovered. A number of historic buildings remain underground or underwater, and are not properly protected against damage or robbery. Protected areas, with limited access due to the potential occurrence of ancient monuments underground or underwater, should be designated. In order to assess the range of occurrence of such monuments from bygone cultures, it is necessary to carry out specialized field studies. The author indicates that smart digital technologies, such as digital maps of the area, satellite and aerial photographs and electromagnetic geo-radar surveys, could be used for such research.

The Internet of Underwater Things (IoUT) is an evolving class of Internet of Things and it is considered the basic unit for the development of smart cities. To support the idea of IoUT, an Underwater Sensor Network (USN) has emerged as a potential technology that has attractive and updated applications for underwater environment monitoring. In such networks, route selection and cluster-head management are still challenging. As the optimal routes always lead to congestion and longer delays while the cluster-head mismanagement leads to ending the USN lifespan earlier. In this paper, we propose a cooperative clustering game that is based upon energy heterogeneity and a penalty mechanism to deal with the cluster head mismanagement issue. Then, we use a non-cooperative evolutionary game for the best relay selection; the results prove that this utility function is the most suitable solution for the relay selection and its strategy selection converges to Nash Equilibrium. The proposed framework is compared with recent schemes using different quality measures and we found that our proposed framework performs favorably against the existing schemes for all of the evaluation metrics.

Building underwater tube tunnel crossings to ease the urban congestion problems has become a popular approach for many cities across the globe. London, New York, Istanbul, Hamburg, Sydney and Brisbane are among these cities. However, the effectiveness and externalities of these expensive mega urban infrastructures have also been questioned widely among urban, transport and environmental planning scholars. Given the international popularity of the topic, this study places a new tube tunnel crossings project from Izmir, Turkey under the microscope. In this heuristic simulation study, policy-on scenarios were tested to determine possible impacts of the underwater tube tunnel-crossing project. The traffic impacts are discussed using simulations assigning the initial origin–destination data. The results of the study revealed that, given the two locations, outer and inner locations over the dagger-shape bay, the capacity increments on the bridge links and the links around the periphery highway did not bring any effective solutions beyond some minor improvements. The findings disclosed that the ineffectiveness of the tube tunnel crossing might be due to the excessive congestion happening all over the downtown area, which clogs the passageways to the bridge. The paper highlights the limitations of the tube tunnel-crossing project, emphasises the need for comprehensive investigations before committing to the project and advocates the emphasis to be actually given for sustainable mobility.

After the European Environmental Noise Directive prescribed noise maps and action plans, wide scientific literature and a consistent number of mitigation strategies emerged for road, railway, airport, and industrial noise. Unfortunately, very little attention has been paid to the noise produced by ports in their surroundings, even though there could be many areas affected by it. At present, more attention seems to be paid to noise produced underwater, mostly for military and security reasons and for its interference with wildlife, rather than airborne noise and its influence on human health. In the framework of a project aiming to shed more light on a topic so far under-investigated, this paper presents an acoustical characterization of different small vessels at various speeds that move around on a daily basis in every type of port, produced by means of short- and long-term measurements. The new information acquired was used to produce a map of noise generated by vessels moving in Livorno’s canals, which branch off in a densely inhabited area. The simulations were validated using long-term measurement. The number of citizens exposed was also estimated and used to calculate the number of highly annoyed people according to the recent curve for road traffic noise proposed by Guski et al. In order to prevent citizen exposure to noise and possible complaints about small boats, different scenarios and possible future situations such as various vessel speeds, limited flow, restricted areas for some categories, or new residential areas were studied.

Racial segregation is an important factor in understanding the foreclosure crisis, but must be understood to operate in particular and specific ways. The primary, positive impact of segregation on foreclosure risk operates prior to loan origination through the differential access to loan quality by race. Afterward, the impact of segregation is negative. Drawing on a rare dataset of loans that combine loan performance and borrower characteristics, I use a competing risks proportional hazard model to examine the impact of race and racial segregation on risk of foreclosure among borrowers. Results indicate that Black segregation has a large, negative impact on foreclosure risk. Instead, the strongest positive contributor to foreclosure is the negative value of the home relative to the balance of the loan (i.e., “underwater,” as measured by the put option), which is also the mechanism that explains most of the difference in the foreclosure rate by race. The negative impact of racial segregation on foreclosure risk is the result of a mismatch between cities with high levels of segregation and cities with large declines in home prices and related foreclosures.

This paper shows an interesting case of coastal landscape reconstruction by using innovative marine robotic instrumentation, applied to an archaeological key-site in the Campi Flegrei (Italy), one of the more inhabited areas in the Mediterranean during the Roman period. This active volcanic area is world famous for the ancient coastal cities of Baiae, Puteoli, and Misenum, places of military and commercial excellence. The multidisciplinary study of the submerged Roman harbour at Nisida Island was aimed at reconstructing the natural and anthropogenic underwater landscape by elaborating a multiscale dataset. The integrated marine surveys were carried out by an Unmanned Surface Vehicle (USV) foreseeing the simultaneous use of geophysical and photogrammetric sensors according to the modern philosophy of multi-modal mapping. All instrumental measurements were validated by on-site measurements performed by specialised scuba divers. The multiscale analysis of the sensing data allowed a precise reconstruction of the coastal morpho-evolutive trend and the relative sea level variation in the last 2000 years by means of a new type of archaeological sea-level marker here proposed for the first time. Furthermore, it provided a detailed multidimensional documentation of the underwater cultural heritage and a useful tool for evaluating the conservation state of archaeological submerged structures.

IntroductionShips and the sea were an omnipresent theme of Greek and Roman art and life. Shipwreck was a well-recognized risk, and an essential ingredient of ‘lost and found’ stories in novels and comedies. Conversely, safe arrival in harbour, the successful end of a journey, was a frequent motif, especially of Roman art. These ideas were obviously underpinned by economic facts: the need for metals, the sea-girt nature of Greece, Rome’s central position in the Mediterranean, and the constant threat of food shortage in the cities of the Mediterranean world generally, necessarily involved transport and trade by sea.Into this scene has stepped, still less than 50 years old, a new character, namely underwater archaeology. Since 1945, over 1000 ancient and medieval shipwrecks have been reported in the Mediterranean, and the roll continues to grow at an unslackened pace. This rapid increase in archaeological resource has been due, of course, mainly to the widespread use of compressed-air diving gear for sport, so that most of the known wreck sites lie in inshore waters, and in popular diving areas. However, recent developments in offshore position-fixing and in underwater communications and robotics have made it possible to explore much deeper sites; the deepest so far to have been surveyed under archaeological direction (by A.M. McCann) is a late Roman wreck at 800 m deep between Sicily and Sardinia.

A number of historians have drawn attention to the incomplete or highly selective visibility of oceanic activity to land-dwellers. Some have gone so far as to refer to 'sea blindness'. However, particularly for scholars with an interest in coastal areas, 'sea blindness' does not capture the intense visibility of beaches and coastal cities in the twentieth century. It also does not engage with changes in science and technology which have permitted the creation and dissemination of vivid images from deep underwater. A critical interrogation of sea visibility, then, is urgently needed. A new term, the 'anxious coastal gaze,' is proposed. This short article discusses two examples of sea visibility in the context of the anxious coastal gaze: oil spills and illegal waterborne migrants. It concludes with a discussion of the future of the anxious coastal gaze in an era of climate crisis and sea level rise.

Investigations of the medieval harbour at the important royal manor of Avaldsnes, south-west Norway, revealed extensive underwater cultural layers and structures like ballast heaps and jetty foundations from the thirteenth until the early sixteenth century. The finds cover a large area and the conditions for preservation of the archaeological material is excellent. A waiting harbour at this strategic site along the fairway to Bergen probably got new functions and became the arena for intense activity during a 100-year period c. 1350–1450. The site known from written sources as Notau was most likely part of the same economic network as Bergen with ties to Hanseatic cities like Lübeck and Danzig. The pottery found on the sea bottom reveals an even wider range of international connections. The results have implications for the relationship between the Norwegian king and the Hanse and the Hanse’s activity outside of the medieval towns. The site is largely undisturbed by modern development and thus very well suited for future research.

Construction of water supply and drainage engineering is one of the main special courses offered to students whose major is Water Supply and Drainage. Through learning of this course, the students should understand earth and rock works, water drainage in the process of construction, pipe slotting construction, non-pipe slotting construction, underwater construction, energy-saving and noise reduction in the design of water supply and drainage system, mechanical equipment installation, water structure, and maintenance and maintenance. Urban supply system and drainage system are major strong guarantee of development of cities and one of an important infrastructure projects. Therefore, it is required to culture graduate in the field of water supply and drainage engineering. The paper offers a construction plan for the course in the following aspects: revision of teaching content, improvement of teaching method, arrangement of test database and exercise database and ways to increasing teaching effect of this course, and result of construction.

This article presents a comparative analysis of the port systems of the Portuguese and British Empires in the Atlantic during the seventeenth and eighteenth centuries. It is based on the study of four insular ports under the sovereignty of these two imperial polities: Angra in the Azores, Funchal in Madeira, Bridgetown in Barbados, and Port Royal in Jamaica. The aim of the analysis is to compare the main factors that led to the choice of these sites as key places in the structure of the respective Portuguese and British imperial models, how they developed to satisfy trade needs and their most significant problems, as well as the extent to which the development of these colonies conformed to what was ‘expected’ of each imperial project, taking into account the geographical, economic and social factors of the respective port cities. The methodological approach to the study of these Atlantic insular ports brings together data from landscape archaeology, nautical and underwater archaeology, together with historical documentation and cartography.

The paper presents the technologies of geoinformation support within hydraulic structures construction and exploitation at the stage of engineering-geological, engineering-ecological and engineering-hydrometeorological surveys for environmental economics during the implementation of major projects in the field of sustainable development of cities and municipalities. The impact of dredging on the natural environment is considered, and a conclusion about the need to study the rate of sedimentation at different stages of exploration, design, construction, and operation of underwater engineering facilities are made. It is shown how the construction of the Marine Facade of St. Petersburg for receiving tourist ferries changed the need for dredging volumes and how this affected the total cost of work. The port of Bronka in Neva Bay is used as an example of sedimentation study during the period of 2005-2007. The developed technologies should help in managing natural risks in the implementation of major projects in the field of construction and operation of hydraulic structures within the framework of the environmental economics in a changing climate.

Abstract Coastal seascapes are composed of a diversity of habitats that are linked in space and time by the movement of organisms. The context and configuration of coastal ecosystems shapes many important properties of animal assemblages, but potential seascape effects of natural and artificial habitats on nearby habitats are typically considered in isolation. We test whether, and how, the seascape context of natural and urban habitats modified fish assemblages across estuaries. Fish were sampled with underwater videos in five habitat types (mangroves, rock bars, log snags, unvegetated sediments, armoured shorelines) in 17 estuaries in eastern Australia. Different habitats supported distinct fish assemblages, but the spatial context of mangroves and armoured shorelines had pervasive ecological effects that extended across entire estuaries. In most estuarine habitats, fish diversity and abundance was greatest when they were in close proximity of mangroves, and decreased due to the proximity of armoured shorelines. Many cities are centred on estuaries, and urban expansion is often associated with the fragmentation of mangrove forests. Our findings emphasize that these transformations of urban estuarine landscapes are likely to propagate to broader ecological impacts detectable in multiple habitats beyond mangrove forests.

The 2030 Agenda and Sustainable Development Goals (SDG) are both an engineering challenge and an opportunity. Clean energy (SDG 7), sustainable cities and communities (SDG 11), and climate action (SDG 13) represent an effort to manage, plan, and develop our buildings and infrastructure. The purpose of this study is to contribute to this challenge by analysing nanomaterials in marine environment structures, both urban and maritime. To do this, we have analyzed different regulations of concrete properties in various countries, defining the characteristics of the cement, coating, water/cement rating, and chloride effect; the difference in durability based on conventional reinforcements and nanomaterials; and use on highly sensitive elements, buildings in marine environments, rubble mound structures, crown walls, and gravity-based foundations for wind power facilities. Division into overhead, underwater, or splash zones entails the use of epoxy resins or silica fume matrices in percentages far below ten percent. Using the most exposed and unfavorable structures, conclusions of application to buildings are established based on the recommendations in maritime engineering most exposed to the actions of the waves. The study concludes with recommendations regarding the durability, increased lifespan, and use of new materials in infrastructure elements in highly adverse marine environments.

Underwater cultural heritage (UCH) constitutes an invaluable asset, which is lately being challenged by the blue growth trend that cannot be easily reconciled with the goal of UCH preservation and promotion. Maritime spatial planning (MSP)—under a place-based approach—creates better chances for UCH to receive more attention in the future compared to other resources, since it is considered to be the key procedure for tackling growing competition among sea users (user-user conflicts) and for mitigating the pressure these users put on the marine environment (natural and cultural). In Greece, a country with great insularity, extensive marine space, and a long and glorious past, UCH resources are in abundance. According to the official Ministry of Culture data-base, there are 88 designated UCH sites throughout the national waters, the majority of which are found very close to the shore. They usually concern ancient cities and built monuments that were eventually submerged (due to earthquakes, geological processes, etc.), so they usually have a mixed nature—terrestrial and marine. These sites, however, constitute a very small part of what is actually lying on the Greek seabed. Estimations for the future identify a rise in accidental discoveries of UCH, due to the blue growth trend and an increase in access to and work in the sea. In this event, much controversy is expected, concerning the appropriate type of management for UCH. The role of MSP in this decision-making process will be decisive, being about “when” and “where” human activities take place at sea, to ensure these are as efficient and sustainable as possible.

Transparency is an important indicator of water quality and the underwater light environment and is widely measured in water quality monitoring. Decreasing transparency occurs throughout the world and has become the primary water quality issue for many freshwater and coastal marine ecosystems due to eutrophication and other human activities. Lake Hongze is the fourth largest freshwater lake in China, providing water for surrounding cities and farms but experiencing significant water quality changes. However, there are very few studies about Lake Hongze’s transparency due to the lack of long-term monitoring data for the lake. To understand long-term trends, possible causes and potential significance of the transparency in Lake Hongze, an empirical model for estimating transparency (using Secchi disk depth: SDD) based on the moderate resolution image spectroradiometer (MODIS) 645-nm data was validated using an in situ dataset. Model mean absolute percentage and root mean square errors for the validation dataset were 27.7% and RMSE = 0.082 m, respectively, which indicates that the model performs well for SDD estimation in Lake Hongze without any adjustment of model parameters. Subsequently, 1785 cloud-free images were selected for use by the validated model to estimate SDDs of Lake Hongze in 2003–2017. The long-term change of SDD of Lake Hongze showed a decreasing trend from 2007 to 2017, with an average of 0.49 m, ranging from 0.57 m in 2007 to 0.42 m in 2016 (a decrease of 26.3%), which indicates that Lake Hongze experienced increased turbidity in the past 11 years. The loss of aquatic vegetation in the northern bays may be mainly affected by decreases of SDD. Increasing total suspended matter (TSM) concentration resulting from sand mining activities may be responsible for the decreasing trend of SDD.

<p><strong>Abstract.</strong> This paper represents the overview of hydrographic surveying and different types of modern and traditional surveying equipment, and data acquisition using the traditional single beam sonar system and a modern fully autonomous underwater vehicle (AUV) IVER3. During the study, the data sets were collected using the vehicles of the Great Lake Research Center at Michigan Technological University. This paper presents how to process and edit the bathymetric data on SonarWiz5. Lastly, it compares the accuracy of the two different sonar systems in the different missions and creates 3D models to display and understand the elevations changes. Moreover, the 3D models were created after importing the data sets in the same coordinate system. In this study, the data sets were recorded by two different sensors in the two study locations in the Keweenaw Waterway in Michigan, U.S. between the cities of Houghton and Hancock. The first one equipment is the Lowrance HDS-7 sonar on the surveying boat, and other one is the EdgeTech 2205 sonar on the fully AUV of IVER3. One of the purposes of this study is to explore the sonar post processing programs, which are very important to interpret sonar and bathymetric data, and obtained the same coordinate system of the study areas. During the project, three main processing programs were used. The first one is UnderSee Explorer 2.6, which has been used to process the data sets of Polar SV boat. Secondly, EdgeTech Discover 4600 bathymetric software used EdgeTech 2205 sonar data sets to create bathymetric files that were used in SonarWiz5. Lastly, SonarWiz5 sonar processing software can be used to process the data sets. After the data acquisition and the data process, six profiles from the first study area and the five profiles from the second study are created to compare the data sets and elevations difference. It is shown that single beam sonar might miss some details, such as pipeline and quick elevation changes on seabed when we compare to the side scan sonar of IVER3 because the single side scan sonar can acquire better resolutions to understand the 3D features, such as pipelines, reliefs etc.</p>

ABSTRACT Oil on the water surface represents just the American Petroleum Institute API &gt; 10 gravity component of any crude oil spill or well blowout, and is identified and tracked by conventional remote sensing means. However, the API ≤ 10 components of the hydrocarbons are not readily accessible by these means. UV sensors on underwater vehicles can sample just a few cubic centimeters at a time and are subject to fouling. Side-scan sonar, under certain conditions, can “see” gas bubbles on the near outer shell of a subsurface plume if they exist early on during a blowout, but cannot assess the entire volume. Oil sequestered in bed sediments in oceans or rivers is not visible to UV sensors, nor is it visible to divers. It is apparent that this sensing gap problem needed to be addressed. A new technology developed by the US Geological Survey, working closely with Williamson & Associates of Seattle, holds promise for rapid mapping and characterization of below-surface hydrocarbons. Crude oil drifting in the deep ocean water column, oil blanketing the seafloor, and oil sequestered in seafloor and river bottom sediments can now be quickly mapped in 3D. If drifting in the seawater column, dispersed oil can be tracked as its distribution evolves over time. This technology also is potentially useful for mapping combined storm-water overflow (CSO, or sewage) deposits, as well as Superfund sites in Puget Sound and other sensitive rivers, bays, and estuaries close to cities that pose serious hazards to both humans and wildlife. The technology is based on a surface-sensitive electro-physical property known as induced polarization (IP). This surface-sensitivity means that highly dispersed IP-reactive materials have more surface area exposed to surrounding water, and are thus more responsive than undispersed materials of the same mass. IP technology has been used successfully for many decades to map disseminated porphyry sulfide deposits on land, but has only been applied commercially at sea since 2007. Recent laboratory and Puget Sound experiments have verified that the IP response of oil dispersed in water and sequestered in sediments is unusually strong: at least 20 times greater than a strong “hit” in an IP survey for sulfide minerals on land. The marine IP system has been towed behind a small boat in as little as 1–2 meters water depth, while one version has been tested (using a towed sled) to 3,500 meters depth. Depending on the cable-streamer design, the depth of detection of chargeable materials in sediments can be greater than 20 meters. It can be used to monitor active drill platforms for leaks. Finally, IP is also strongly reactive to buried pipelines; in the Gulf of Mexico there are over 43,000 miles of poorly-located, often hidden, corroding pipe. We can now map it precisely.

The present research provides the first demographic reference points for tropical seahorses, relevant to conservation of this largely tropical genus Hippocampus, which is listed on the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) Appendix II. Findings defined the life-history and in situ vital rates of the tiger tail seahorse, H. comes, expanding previous understanding of demographic diversity in reef fishes. We quantified growth, reproduction and survival rates, drawing on mark–recapture intervals from focal observations, underwater visual census and fisheries landings data. The smallest settled individual was 2.7 cm and first benthic cohorts measured 3.0–4.0 cm. Assuming individually variable growth, the mean parameters for the von Bertalanffy growth equation were Linf = 16.7 cm, K = 2.9 year–1 and t0 = 0.03. Physical maturity occurred at 9.3 cm, reproductive activity at 11.6 cm and annual recruitment during the dry, inter-monsoon window from February to May. Size-dependent survivorship ranged from 3.5% to 45.0% year–1 and longevity was ≥2.5 years. In H. comes, characteristics governing population turnover align with opportunistic strategists, whereas reproductive traits align more closely with equilibrium strategists. Non-extractive marine reserves are one management approach that could serve such intermediate strategists, providing refugia for colonisation, while protecting important large, fecund adults.

HighlightDamage to coral reefs by ship aground is twice the area of a football fieldFound four zones of damage including runoff, dune, blow and dispersalMortality of live coral and other benthic biota ranges from 75-100% in the affected locationThe form of damaged live coral growth is predominantly slow growing.Eight hard coral species were found on the IUCN-Redlist list with a vulnerable status.AbstractShip grounding on coral reefs often results in physical and biological damage, including dislodging and removal of corals from reefs, destruction of coral skeletons, erosion and removal of sediment deposits, and loss of three-dimensional complexity. Indonesia, as an archipelagic country, is very vulnerable to various pressures; for example, the case of ship grounding is a great concern of scientists, managers, divers, and sailors themselves. Most of the damage is very severe. The purpose of the research conducted is to identify the condition of the live coral cover, mapping the type and extent of coral reef damage, affected coral species, their conservation status, and to quantify the extent of the area of coral reef damage. Measuring the extent of damage to coral reef ecosystems using the fishbone method, while the level of damage and its impact was measured using the Underwater Photo Transect (UPT) and belt transect method. The event of the grounding of the MV Lyric Poet on the Bangka Waters, Bangka-Belitung Province, has caused damage to the coral reef ecosystem. There are four damage zones identified, i.e., trajectory, mound, propeller, and dispersion zone. Corals are damaged with a total area of 13.540m2; equivalent to twice that of an international football field. Diversity of hard coral found as many as 49 species included in the CITES-Appendix II. A total of eight protected species are included in the IUCN Red List with extinction-prone status.

"This paper aims to describe the evolution of noise regulations for merchant ships over the last four decades, analysing the most important aspects with respect to crew, passengers and exposed populations in cities, in line with the requirements of the European Union to reduce the environmental impact of transport. The paper also analyses the changes in regulations aimed at not only regulating noise and vibration inside the ship, but also noise emitted to the port and underwater radiated noise. We shall also include Classification Societies, given the importance of their standards in ensuring increasing levels of comfort on board ship."

PurposeDeepor Beel is one of the Ramsar Site and a wetland of great biodiversity, situated in the south-western part of Guwahati, Assam. With urban development at its forefront city of Guwahati, Deepor Beel is under constant threat. The study aims to calculate the lake water volume from the water surface area and the underwater terrain data using a triangulated irregular network (TIN) volume model.Design/methodology/approachThe lake water surface boundaries for each year were combined with field-observed water level data to generate a description of the underwater terrain. Time series LANDSAT images of 2001, 2011 and 2019 were used to extract the modified normalized difference water index (MNDWI) in GIS domain.FindingsThe MNDWI was 0.462 in 2001 which reduced to 0.240 in 2019. This shows that the lake water storage capacity shrank in the last 2 decades. This leads to a major problem, i.e. the storage capacity of the lake has been declining gradually from 20.95 million m3 in 2001 to 16.73 million m3 in 2011 and further declined to 15.35 million m3 in 2019. The fast decline in lake water volume is a serious concern in the age of rapid urbanization of big cities like Guwahati.Originality/valueNone of the studies have been done previously to analyze the decline in the volume of Deepor Beel lake. Therefore, this study will provide useful insights in the water resource management and the conservation of Deepor Beel lake.

In 1954, Japan was barely recovering from a devastating defeat in World War II and a humiliating seven-year American occupation when the United States dropped two atomic bombs over Hi roshima and Nagasaki. Plunged into the Atomic Age, Japan produced a film, Gojira (Godzilla), that reflected the psychological trauma of a people trying to salvage their cities, their culture, and their lives. In the film, the monster is the physical embodiment of the destructive forces of nuclear power. Its poignancy is derived from its historical allusions to real events, including the Lucky Dragon 5 incident in which a Japanese Tuna trawler was covered in radioactive ash from the detonation of an underwater American atom bomb. Moreover, the film captures the conflict between censorship of athe exposition of truth, focusing on the burden of scientific responsibility. Fi nally, the film concludes by underscoring the ultimate victimization of humanity under the tyranny of massive destruction and warns against the perils of nuclear proliferation.

Abstract Though the social consequences of financialization are well-known, their influence on radical politics remains unclear. The failure of the democratization of finance led to unprecedented levels of debt and to new types of social movement. Across the globe, the collapse of mortgage markets, and the promise of private property for all, generated strong contestation. In Spain, the movement against debt, structured around the Platform of People Affected by Mortgages, is exceptionally powerful, contributing to unprecedented political change. What makes this anti-eviction movement so successful? How can a brand new organization, off the well-worn paths of trade unions and political parties, mobilize debtors, despite their isolation, despondency and lack of organizational skills? Combining visual ethnography with a survey of 568 underwater borrowers from 12 cities, this article shows who the over-indebted activists are. Construction workers and migrant women played a central role in transforming individual guilt and shame into political empowerment.

With the intensive development of cities, the utilization of underground space has attracted more and more attention from industry and academia. Underground rail (metro) in cities has become an imperative mode for people in their daily lives. Meanwhile, the safety of rail tunnel construction has constantly been a challenging issue because of the presence of complex strata containing shallow biogas. Accidents in tunnel construction because of shallow biogas which resulted in massive casualties and property loss have been reported in some recent literature. The excavation of formations containing shallow biogas not only poses a threat to the safety of the earlier stage of tunnel construction but also affects the later operation of metro lines. Therefore, the safety problem caused by shallow biogas should be taken into consideration seriously and avoided in the pre-construction stage. A typical underwater metro tunnel, Hangzhou Metro Line 6, is introduced in this study to suggest the proper approach to deal with the biogas problem during the construction process. The generation mechanism of shallow biogas is clarified and the process of identifying biogas risk during strata exploration is also discussed. A risk identification and control system for shield tunneling through biogas strata is proposed to mitigate the potential dangers of shallow biogas during the construction process. This study provides actual construction experience and countermeasures for other similar metro tunnel projects that encounter biogas strata to diminish the potential risks and avoid severe accidents.

Boeck, Moore et al. “NASA Climate Time Machine”, animated by Goddard Scientific Visualization Studio, Moore Boeck and CReSIS. NASA's Global Climate Change website, https://climate.nasa.gov/interactives/climate-time-machine.The NASA Climate Time Machine site is part of that agency’s Global Climate Change initiative and is designed to provide users with a visual guide to the changes the planet has undergone in recent history to further education about climate change, as well as the potential effects of such change on the world.The site proper is divided up into four sections; Sea Ice, which shows the reduction of polar ice from 1979 through to 2015; Sea Levels, examining the consequences of melting sea ice and the consequent raising of sea levels on the United States’ states which border the Gulf of Mexico; Carbon Dioxide, which displays global CO² levels from the start of the millennium to 2015; and finally Global Temperature, which tracks the changes in the world’s temperature since 1884.The Climate Time Machine is a good way for children to visualize some of what they’ve learned in class in a dramatic fashion. This is particularly evident in the case of the sea level section as it shows both the cities of Miami and New Orleans disappearing underwater. All of the pages provide some level of interaction in the form of sliders which advance the changes on a large map. There is also some explanatory text on each page to provide context for what is being displayed. This is perhaps the weakest aspect of the site as there is not much to read and what is there is not really designed for younger readers. Ideally this would be used as part of a wider discussion in class or with a more learned adult, such as a parent, if only to give a better idea of what the child is seeing. Overall though, the simplicity of the site is a benefit and comes from a very authoritative source. Suggested age group: 12+. Highly Recommended: 3 out of 4 starsReviewer: Shane AllanShane is an MLIS student at the University of Alberta and is currently employed as a cataloger, reorganizing a collection of curriculum materials. His favourite children's book is the Transall Saga by Gary Paulsen for its mix of adventure, fantasy and science fiction. It shows the value and importance of communication, companionship, and determination in the face of tremendous odds.

Cars crest the rise behind the truck stop and drop cones of light over the highway. Ryan dunks his head under a tap. He rubs red dust from his pores and tries to drink some water, but it slides down his throat like a length of wire.His older brother Josh fills their drink bottles. “Wanna get some chips or something?”Ryan shakes his head. He’s sick of watching Josh’s pulpy tongue poke his broken tooth. Their dad never left visible marks before—Ryan used to wish for a cut or bruise, so someone at school could see it. He shivers and clutches his coat tight. Josh says, “We got money.”Ryan wonders how Josh stole it. He didn’t know there was anything to steal. He stares back down the road.“Fine, fuck, I’ll get—”Ryan nudges him and he looks over his shoulder. A square silhouette approaches. The brothers stand back as a two-storey house pulls up in front of them, strapped to the back of a truck. The house is cut in half, patched with pale afterimages of furniture and light fittings. A door slams and a tattooed man with a white wedge of beard climbs out of the cabin. He stretches and heads for the toilets. Josh sidles up to the house and runs his hands along the straight, fresh edge of the floorboards. Sawdust settles onto his hoodie. He laughs and hurls his bag into one of the rooms. “Shit yeah. You coming?” Ryan hesitates. He remembers the time Josh’s Torana—a windowless wreck, used for drifting in paddocks and chasing kangaroos—broke down at the back of their property. Ryan and their dad towed Josh in the four-wheel drive while he sat in the Torana, steering with his knees. He started swinging wide, bouncing the back of the car off tree trunks, until he overshot and hit an old gum headfirst. The cable snapped, jerking the four-wheel drive to a halt. Ryan’s head smacked against the dash. Josh emerged from the smoking Torana with a bloody nose, laughing hysterically—thumping the bonnet and laughing hysterically—even after his dad came over and hit him on the back of the head. Through a window in the far wall they watch the driver eat a sausage roll. Ryan follows Josh upstairs and they stand on the edge of the second floor, where the distorted acoustics amplify the traffic sounds. From this angle, the outback barely conceals the curvature of the earth. The moon is a globe of bone amongst the clouds, a ball and socket. Ryan thinks they’re in a kid’s bedroom; a mural on the far wall depicts the bottom of the ocean and a tinted window spreads faded colours on the floor. He tries to imagine the room with all its walls in place. The brothers hide in a back room when they hear the driver's footsteps. The driver slides a torch over the house and light filters through the floorboards in front of them. They press themselves against the wall. Ryan starts shivering again and Josh elbows him in the ribs. The truck eases onto the road and the house groans, its unsupported floorboards dipping and lifting like piano keys. Signs and lights flick past. The brothers creep downstairs, struggling to stay upright on the vibrating staircase. Josh opens two tins of baked beans. A string of cold sauce as thick as an artery spills down Ryan’s neck. They place the empty tins on the floor and bet on which one will roll off the edge first. Josh wins. He grabs Ryan’s head and rubs his knuckles into it. Josh runs into the bathroom, which juts out over the edge of the trailer. Ryan hangs back in the doorway. Instead of a toilet Josh finds a small circle cut out of the floor. He steadies himself and pisses in it. Ryan sprints into the other room and pisses out the window. They laugh and piss until a horn blares behind them. Ryan ducks. Urine splatters on the sill. He scrabbles with his pants. He’s pissed on someone’s windscreen. The horn’s still going. Headlights hit the trees beside him. Josh comes in from the toilet and Ryan grabs him and pulls him to the ground. A four-wheel drive appears beside them. There’s barely enough room on the road; the truck swerves away and a branch scrapes along the roof of the house. The passengers hang out the windows, screaming abuse. Josh stumbles onto his feet and gives them the finger. Someone hurls an empty coke can and it lands on the second floor. Then the car is gone and only the wind remains, filling the house with the whining roar of a depressurised aircraft. The trees are a smear of static. Josh smacks Ryan on the back of the head. Ryan swings instinctively. Josh deflects his fist and knocks him to the floor and Ryan’s head hits the skirting board. Something crumbles. Ryan presses his thumb into Josh’s black eye and Josh twists his arm behind his back. When they were kids Josh pinned Ryan in this position and shoved gravel into his mouth. Ryan remembers the stones scratching his teeth, the bloody mud he spat out. Josh lets him up and Ryan scrambles into the corner, sick with sudden panic. He kicks his bag away. Josh wipes his mouth and laughs. He crouches down and stares at the spot where Ryan’s head hit the wall. One of the panels has collapsed inwards. Josh snorts. “Look what your fucking head did!” He pulls out the panel and tosses it onto the road. He shines his torch into the space behind it, brushes away the cobwebs and extracts a cheap gold box. “Well, well, well,” he mutters. He sets it on the ground and dusts the lid off. He tries to pry it open it but it’s locked. Ryan looks over. Josh grips the box in both hands and pulls. For a moment his top teeth dig into his lip and then the box bursts open, scattering pieces of silver. Ryan reaches out his hand, expecting jewellery, but he jerks it back when he finds a razor near his foot. The floor is littered with needles and knives. Josh picks up a brown glass bottle and squints at the label. “Iodine.” They stare at the blades in silence. A sand bank slides past as steadily as a sine wave. Josh carves the word FUCK into the floor with a scalpel. Ryan cringes but doesn’t dare warn him about diseases. On long-distance drives Ryan often stares out the window and imagines his vision is a laser-beam, cutting cleanly through cities, forests, passers-by. Now he pictures a wrecking ball swinging into the darkness and colliding with a run-down rollercoaster. He imagines the ball smashing through the tangle of struts and tracks; wrapping around and around a corkscrew section like a yoyo; sending a train of carriages hurtling through the remains of a loop. A few hours later the house passes through a town surrounded by silos and steel windmills. The brothers retreat to the mural room. Streetlights slide on and off them: orange, black, orange, black, orange, black. Josh waves at the people on the balcony of the pub. In a slouched house over a hardware store Ryan glimpses, through half-closed curtains, a topless woman sitting on the edge of a bed, combing her hair. He tries to make out the name of the town on the shopfronts. Josh lights a joint, indifferent. Ryan slides his torch over the door frame, which is marked with the family’s heights. The vibrations blur the words, but he makes out the name “Molly” at eye level. He wonders if this is her room. He stares at the underwater scene and remembers reading somewhere that squids lay eggs via a funnel under their eyes, so their offspring emerge like hard, heavy tears. Josh offers the joint to Ryan, who snatches it and takes a shallow drag. Josh brushes dandruff off his sleeves. Ryan drops the joint when a siren starts to wail: they scramble to their feet and run over to the back window, fearing the police, but the road’s empty. Josh looks up and shouts, “Smoke detector!” Ryan starts waving his jacket to clear the smoke, but Josh just rips the detector from the ceiling and hurls it into a dam beside the road. Once the houses thin out the brothers climb back downstairs and unroll their sleeping bags. Ryan uses his pack as a pillow but Josh’s is still full of tins. Dark branches clasp the stars. Ryan gets up and tugs at his penis in the toilet, watching the bitumen slide under the hole like a belt sander. He tries to remember the scene above the hardware store—the line of tea lights on the windowsill, the mosquito net over the bed, the woman’s small, pale breasts—but his mind keeps replaying the image of a young girl pressing a razor into her thigh. They're woken a few hours later by footsteps. Ryan opens his eyes. Josh is already on his feet. “What the hell is that?” The ceiling creaks again and Josh picks up the torch and the scalpel. “I'm gonna take a look.” They creep upstairs. The hall is empty. Something shuffles in one of the rooms and slams against the wall. Josh whispers, “There ain’t no doors on that side of the hall. The fucking door's in the other half of the house.' He grabs the end of the wall and leans out, struggling to see around it. The wind blasts him back and he cups his hands over his black eye. He pushes the torch into Ryan’s chest. “Go. You go.” Ryan tries to turn away but Josh blocks him and says, “Don’t be a dickhead. Just see what’s over there.” The dark, crinkled skin around his eye shines with tears. “Fuck’s sake, my eye’s killing me. I can’t go.” He pushes Ryan again. With his free hand Ryan feels for the frame behind the plaster. He swings his leg around the wall, plants his foot on the other side, presses his chest against the end of the wall and edges into the other room. It’s empty. Sliding doors in the far wall conceal a walk-in wardrobe. A door on the right leads to an en suite. His foot crunches on the coke can and he kicks it onto the road. He pushes the bathroom door open and the torch beam slides over the tiles. He glimpses movement behind him in the mirror, but it’s only the trees. The tiles remind him of the killing floor on their chicken farm. When he and Josh were little their dad just cut the chickens’ heads off with an axe and let them run around spurting blood out of their necks, but a few years ago he got new machinery installed. Now the chickens were strung up by their feet on an overhead conveyor belt that carried them to a trough filled with electrified water, which killed them as soon as their heads hit it. He walks back into the bedroom and stares at the sliding doors. “Oi hurry up!” Josh shouts from the hall. “Fuck you.” “Fuck you, dickhead!” Ryan pushes a sliding door open and shines his torch in. A man crouches in the darkness, gripping a bottle of colourless liquid in both hands. His clothes are stuffed with newspapers; his beard clings to his chin like clotted blood caked together. He stares at Ryan and shouts, “Bastards! Leave me alone ya bastards! Get outta here! Get out!” He hurls the bottle and it smacks into Ryan’s shoulder. The bottle smashes on the floor; shards of glass cascade onto the highway. The man stumbles out of the wardrobe, lunging at Ryan, grabbing at his jacket. Ryan reaches around the wall and Josh pulls him over. The man slams his fists rhythmically, like pistons, into the other side of the wall. They scramble downstairs and Ryan takes off his jacket and waves it over the edge, screaming to get the driver’s attention. He looks up and sees the man shouting at him, tears streaming sideways across his face. Josh pulls Ryan back but he struggles free. Ryan crouches near the edge and stares at the scrub racing past. There’s a hill ahead and the truck’s slowing down. Josh sees what he’s thinking and calls him an idiot, but he’s already leaning forwards, judging the distance, waiting for the driver to downshift. Josh grabs him by the collar and hisses something but he doesn’t listen and pulls away and jumps. His head smacks solidly against a root and his arm twists under his torso, grinding into the gravel. He lies on his back and spits out black dust. Blood dribbles out of his arm. When the house reaches the top of the hill something flies out and bounces along the side of the road. Ryan gets to his feet and limps towards it. He searches through the bushes and finds his bag with half the tins in it. The roof of the house disappears over the top of the hill and he imagines Josh reaching his destination, perhaps a few hours after dawn, on a small hill out in the bush somewhere, where the morning light is as sallow as blood plasma and the other half of the house is already waiting.

The headlines of April 8, 1998 left little room for negotiation: "Mars romantics face the truth -- there's nothing out there" (The Australian); "Images form Mars scuttle face theory" (Courier-Mail). According to the reports, the infamous Face on Mars mystery has finally been solved. But has it? Such forceful pro-NASA/anti-anomaly media coverage should, rather than settle us into complacency, set mental alarm bells ringing. We should be asking the (interestingly portentous) question: if NASA did discover a Face on Mars, would they admit it? This paper suggests the answer is 'no'. In his essay "Social Intelligence about Hidden Events", sociologist Ron Westrum noted that if a person perceives a phenomenon that the person's society deems impossible, then the socially determined implausibility of the observation will cause the observer to doubt his or her own perceptions, leading to the denial or misidentification of the phenomenon (McLeod et al., 156). When Europeans arrived in Australia and sent back descriptions of a particularly bizarre creature they encountered here -- eventually named a 'platypus' -- biologists initially refused to believe it existed. Although Australia was (to Europeans) an alien environment in which new, and perhaps even radical, discoveries were expected and desired, an egg-laying furry underwater animal with a duck's bill, four webbed feet and a poisonous spike on its heel was just too much to handle. It was 'unacceptably new'. We have, as this example shows, heavy expectations about the future and the new, and are often reluctant to accept developments which differ radically from those expectations. For western culture, the exploration of space -- the final frontier -- has become synonymous with progress, with future and the new, and with moving away from a past and towards or into a future about which we already have many expectations. One particularly brutal violation of this conception of progress and the comfort of a confinable and predictable future would be the discovery of a 1.5 mile long, 1.2 mile wide humanoid face carved into the surface of Mars, staring back out into space (as was apparently photographed by the NASA Viking probe in 1976). It's hardly surprising, then, that the social institution perhaps most entrusted with propagating the dominant construction of the new and the future -- NASA -- should be the most ardent anti-Face voice in the controversy. (Readers interested in NASA's role in 'playing down' public curiosity in the Face and adjoining pyramids are recommended Professor Stanley V. McDaniel's The McDaniel Report, in which he cites many examples of NASA's deliberate misrepresentation of the geological and geometrical data gathered concerning the Cydonia region on Mars). Official confirmation of artificial pyramidal and humanoid structures on Mars would essentially dissolve dominant constructions of human civilisation's past and future. We would be forced to confront the possibilities that human civilisation has either had contact with extraterrestrial life some time in its past, or that humans have been capable of space travel and interplanetary colonisation before humans were thought to have even existed. Our 'present' would be equally damaged; our most cherished 'new' technologies would re-appear as inferior versions of those already developed -- they wouldn't be 'new' at all. The cultural (not to mention psychological) repercussions would be extreme. It is highly unlikely then, were such objects photographed clearly enough to remove uncertainty as to the nature of their origin, that NASA would release those photographs, since such a discovery would severely threaten its claim (and the scientific tradition it represents) to a monopoly of true descriptions of the nature of the physical world and the public position of science (Westrum, "UFOs" 272). I suggest that NASA's role in the public debate about the Martian enigmas should be approached with extreme scepticism. NASA's treatment of the Viking frames has indicated its willingness to misrepresent the data in a deliberate attempt to suppress public support of further investigation. Some reasons why NASA might take this course of action have been suggested above. We need not succumb to 'conspiracy theory' to explain NASA's behaviour, as conventional, if discomforting, sociological explanations are both simpler and more easily applied. Depending on how much power we afford prestige, we may or may not choose to accept the most recent NASA photographs of the Face as definitive. What we should not overlook, though, is that we do have a choice. References Bull, Sandra. "Images from Mars Scuttle Face Theory." The Courier-Mail 8 April 1998. Leech, Graeme. "Mars Romantics Face the Truth: There's Nothing Out There." The Australian 8 April 1998. McDaniel, Stanley V. The McDaniel Report: On the Failure of Executive, Congressional and Scientific Responsibility in Investigating Possible Evidence of Artificial Structures on the Surface of Mars and in Setting Mission Priorities for NASA's Mars Exploration Program.. Berkeley: North Atlantic, 1993. Westrum, Ron. "Social Intelligence about Anomalies: The Case of UFOs." Social Studies of Science 7 (1977): 271-302. Westrum, Ron. "Social Intelligence about Hidden Events" (1982) qtd. in McLeod, Caroline, Barbara Corbisier, and John E. Mack, "A More Parsimonious Explanation for UFO Abduction." Psychological Inquiry 7 (1996): 156-68. Citation reference for this article MLA style: Adam Dodd. "Unacceptably New: Cultural Factors in the 'Face on Mars' Controversy." M/C: A Journal of Media and Culture 1.1 (1998). [your date of access] <http://www.uq.edu.au/mc/9807/mars.php>. Chicago style: Adam Dodd, "Unacceptably New: Cultural Factors in the 'Face on Mars' Controversy," M/C: A Journal of Media and Culture 1, no. 1 (1998), <http://www.uq.edu.au/mc/9807/mars.php> ([your date of access]). APA style: Adam Dodd. (1998) Unacceptably new: cultural factors in the 'face on Mars' controversy. M/C: A Journal of Media and Culture 1(1). <http://www.uq.edu.au/mc/9807/mars.php> ([your date of access]).