Relevant bibliographies by topics / Disturbance on riverbed

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Academic literature on the topic 'Disturbance on riverbed'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "Disturbance on riverbed"

1

Choi. "Analyses of Riverbed Changes and Physical Disturbance Evaluations by Weir Installation in a Reach." Journal of the Korean Society of Civil Engineers 34, no. 4 (2014): 1203. http://dx.doi.org/10.12652/ksce.2014.34.4.1203.

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2

Jakubínský, Jiří, Igor Pelíšek, and Pavel Cudlín. "Linking Hydromorphological Degradation with Environmental Status of Riparian Ecosystems: A Case Study in the Stropnice River Basin, Czech Republic." Forests 11, no. 4 (April 18, 2020): 460. http://dx.doi.org/10.3390/f11040460.

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Recently, increasing attention has been paid to the anthropogenic degradation of the riverbed and its relationship to the ecological status of the adjacent river landscape. The key objective of this research was to determine the extent of the disturbance of the selected small streams and their riparian zone in a study area located in a forest and forest-agricultural landscape in the Czech Republic. The next step was to analyze the mutual relationships between the ecological status of the riparian vegetation and the hydromorphological status of the riverbed. The main working hypothesis considered the good hydromorphological status of the river as reflected in the favorable environmental status of the surrounding riparian habitats and vice versa. It was found in more than 90% of the total length of studied watercourses that the character of linkages between channel morphology and the ecological status of riparian vegetation is directly influenced by anthropogenic activities. An interesting finding is that the degraded streams in lowland sites are often encompassed by natural or close-to-natural habitats. On the contrary, the natural status of the riverbed was found in a significantly forested headwater area, but the riparian habitats did not reach even a close-to-natural status. This paper contributes to clarifying the significance of human impact on the river morphology, reflected in the reduction of connectivity between the terrestrial and fluvial parts of the river landscape. It helps to explore the most important disturbances affecting mutual interactions between the river and the riparian habitats.
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3

Gibbins, Chris, Damià Vericat, Ramon J. Batalla, and Carlos M. Gomez. "Shaking and moving: low rates of sediment transport trigger mass drift of stream invertebrates." Canadian Journal of Fisheries and Aquatic Sciences 64, no. 1 (January 1, 2007): 1–5. http://dx.doi.org/10.1139/f06-181.

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During floods, river invertebrates may be swept downstream in large numbers. This so-called "catastrophic drift" leads to a major redistribution of animals, as well as reduced fitness and increased mortality among drifters. We present the first field evidence of the role of sediment movement in triggering catastrophic drift. Experiments indicate that the loss of invertebrates from the bed becomes exponential when shear stress reaches the threshold that entrains bedload. However, we found that low rates of bedload are sufficient to rapidly denude patches of riverbed of their invertebrates and so trigger mass drift. Such low bedload rates occur during small floods. As small floods occur frequently, our results suggest that episodes of catastrophic drift are frequent. This conclusion is counterintuitive, as the persistence of invertebrate communities on riverbeds suggests that such events cannot be truly catastrophic. Moreover, the drift losses that we observed occurred in the absence of significant geomorphic disturbance; this is inconsistent with the notion of catastrophic drift being a response to hydrological disturbance events. We argue that a new definition of catastrophic drift is needed, a definition based not on drift magnitude or the triggering role of sediment movement, but on the population consequences of downstream displacement.
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4

Albertson, Lindsey K., and Melinda D. Daniels. "Crayfish ecosystem engineering effects on riverbed disturbance and topography are mediated by size and behavior." Freshwater Science 37, no. 4 (December 2018): 836–44. http://dx.doi.org/10.1086/700884.

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TASHIRO, Takashi, Shintaro WATANABE, and Tetsuro TSUJIMOTO. "EVALUATION OF DISTURBANCE ON RIVERBED BY ESTIMATING DETACHMENT OF ATTACHED ALGAE DUE TO BED-LOAD TRANSPORT." PROCEEDINGS OF HYDRAULIC ENGINEERING 47 (2003): 1063–68. http://dx.doi.org/10.2208/prohe.47.1063.

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6

Chang, Cheng-Kai, Jau-Yau Lu, Shi-Yan Lu, Kuo-Ting Hsiao, and Dong-Sin Shih. "Using a PIV Measurement System to Study the Occurrence of Bursting in the Flow Over a Movable Scour Hole Downstream of a Groundsill." Water 12, no. 5 (May 14, 2020): 1396. http://dx.doi.org/10.3390/w12051396.

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Generally, hydraulic structures are installed along with rivers in Taiwan to prevent erosion. The groundsill is one of the most common structures to protect the underlying riverbed. However, the occurrence of bursting during the process of scouring can intensify the disturbance of sediment in the bed, sometimes even causing hydraulic structures to collapse. This paper aimed to study the mechanisms of bursting, the effects of bursting, and the scouring exceedance probability of sediment movement. To study this topic, a particle image velocimetry (PIV) was used to measure the hydraulic characteristics of a scour hole under different flow conditions. The results showed that, firstly, the bursting and the sediment entrainment rate increased with time at the beginning. Secondly, when bursting occurred at the beginning stage of scouring, the averaged velocity of main flow was reduced by about 30% and the thickness of the riverbed was deepened by about 20%. Moreover, when scouring time was 15 min, at the location of maximum scouring depth, all the experimental groups carried the proximity values of the scouring exceedance probability that stuck to a range from 35% to 53% at the bursting stage. Therefore, the scouring exceedance probability of the bursting of the maximum scouring depth can be further applied to designs and to protect the foundation of hydraulic structures.
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7

Abia, Akebe, Chris James, Eunice Ubomba-Jaswa, and Maggy Benteke Momba. "Microbial Remobilisation on Riverbed Sediment Disturbance in Experimental Flumes and a Human-Impacted River: Implication for Water Resource Management and Public Health in Developing Sub-Saharan African Countries." International Journal of Environmental Research and Public Health 14, no. 3 (March 15, 2017): 306. http://dx.doi.org/10.3390/ijerph14030306.

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8

Xu, Mengzhen, Na Zhao, Xiongdong Zhou, Baozhu Pan, Wei Liu, Shimin Tian, and Zhaoyin Wang. "Macroinvertebrate Biodiversity Trends and Habitat Relationships within Headwater Rivers of the Qinghai-Tibet Plateau." Water 10, no. 9 (September 7, 2018): 1214. http://dx.doi.org/10.3390/w10091214.

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Highland running-water biodiversity has gained growing interest around the world, because of the more pristine conditions and higher sensitivity to environmental changes of highland rivers compared to the lowland rivers. This study presents the findings of systematic investigations and analyses on running-water biodiversity of macroinvertebrate assemblages in the most important headwater streams in the Yalutsangpo and Sanjiangyuan River basins in the Qinghai-Tibet Plateau and the lowland headwaters of the Songhua River, Juma River, and East River during the non-flood seasons of 2012 to 2016. The results indicated that the headwaters on the plateau had a higher regional biodiversity compared to the lowland rivers with the similar flow and substrate conditions. Even though the local diversity of the highland rivers was not significantly different at each single site, the taxonomic composition was significantly different with several rarely seen species scattering among the different sites, resulting in a high regional biodiversity. The biodiversity and composition of macroinvertebrates were strongly affected by the altitude gradient and the environmental variables associated with altitude. To be specific, for the Yalutsangpo River, canonical correspondence analyses of the macroinvertebrate assemblages and their environmental variables indicated that altitude, stream condition (represented by river pattern, riverbed structures, substrate composition), and water temperature influence macroinvertebrate taxa composition. Because of the restrictive plateau conditions including low water temperature, poor aquatic and riparian vegetation, and low runoff, the macroinvertebrate assemblages showed low biodiversity and were vulnerable to potential human disturbance/climate change. Therefore, it is essential to conserve suitable conditions of the determinative environmental variables to protect the unique and high regional biodiversity of the headwaters on the Qinghai-Tibet Plateau.
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9

Perona, P., and B. Crouzy. "Resilience of riverbed vegetation to uprooting by flow." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 474, no. 2211 (March 2018): 20170547. http://dx.doi.org/10.1098/rspa.2017.0547.

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Riverine ecosystem biodiversity is largely maintained by ecogeomorphic processes including vegetation renewal via uprooting and recovery times to flow disturbances. Plant roots thus heavily contribute to engineering resilience to perturbation of such ecosystems. We show that vegetation uprooting by flow occurs as a fatigue-like mechanism, which statistically requires a given exposure time to imposed riverbed flow erosion rates before the plant collapses. We formulate a physically based stochastic model for the actual plant rooting depth and the time-to-uprooting, which allows us to define plant resilience to uprooting for generic time-dependent flow erosion dynamics. This theory shows that plant resilience to uprooting depends on the time-to-uprooting and that root mechanical anchoring acts as a process memory stored within the plant–soil system. The model is validated against measured data of time-to-uprooting of Avena sativa seedlings with various root lengths under different flow conditions. This allows for assessing the natural variance of the uprooting-by-flow process and to compute the prediction entropy, which quantifies the relative importance of the deterministic and the random components affecting the process.
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10

Backes, D., M. Smigaj, M. Schimka, V. Zahs, A. Grznárová, and M. Scaioni. "RIVER MORPHOLOGY MONITORING OF A SMALL-SCALE ALPINE RIVERBED USING DRONE PHOTOGRAMMETRY AND LIDAR." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2020 (August 12, 2020): 1017–24. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2020-1017-2020.

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Abstract. An efficient alternative to labour-intensive terrestrial and costly airborne surveys is the use of small, inexpensive Unmanned Aerial Vehicles (UAVs) or Remotely Piloted Aerial Systems (RPAS). These low-altitude remote sensing platforms, commonly known as drones, can carry lightweight optical and LiDAR sensors. Even though UAV systems still have limited endurance, they can provide a flexible and relatively inexpensive monitoring solution for a limited area of interest. This study investigated the applicability of monitoring the morphology of a frequently changing glacial stream using high-resolution topographic surface models derived from low-altitude UAV-based photogrammetry and LiDAR. An understanding of river-channel morphology and its response to anthropogenic and natural disturbances is imperative for effective watershed management and conservation. We focus on the data acquisition, processing workflow and highlight identified challenges and shortcomings. Additionally, we demonstrate how LiDAR data acquisition simulations can help decide which laser scanning approach to use and help optimise data collection to ensure full coverage with desired level of detail. Lastly, we showcase a case study of 3D surface change analysis in an alpine stream environment with UAV-based photogrammetry. The datasets used in this study were collected as part of the ISPRS Summer School of Alpine Research, which will continue to add new data layers on a biyearly basis. This growing data repository is freely available for research.
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Dissertations / Theses on the topic "Disturbance on riverbed"

1

Hyodo, Makoto. "Ecological Evaluation of Shifting Habitat History for Riverbed Management." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/202698.

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2

田代, 喬., Takashi TASHIRO, 慎多郎 渡邉, Shintaro WATANABE, 哲郎 辻本, and Tetsuro TSUJIMOTO. "掃流砂礫による付着藻類の剥離効果算定に基づいた河床攪乱作用の評価について." 土木学会, 2003. http://hdl.handle.net/2237/8577.

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