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Tesi sul tema "Aggradation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 10 marzo 2023

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1

Townsend, Kirk F. "A Chronostratigraphic Record of Arroyo Entrenchment and Aggradation in Kanab Creek, Southern Utah." DigitalCommons@USU, 2015. https://digitalcommons.usu.edu/etd/4492.

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Abstract (sommario):

Arroyos are entrenched channels characterized by near-vertical walls of alluvium and flat channel bottoms. Historic channel entrenchment in the southwest United States during the late AD 1800s and early 1900s has stimulated extensive research on these dynamic fluvial systems. The near-synchronous episodes of arroyo entrenchment and aggradation in Kanab Creek and other drainages in southern Utah during the last ~1 Ka has led many researches to argue that hydroclimatic forcings drive arroyo processes. These hypotheses remain largely untested, and there remains considerable uncertainty regardi

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2

Shaffner, Adam Levis. "SPECIFIC GAGE ANALYSIS ON THE LOWER WHITE RIVER, ARKANSAS." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/1009.

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This study documents the stage adjustments in the Lower White River between 1931 and 2012 at four rated gaging stations along the trunk stem of the river. The study reach extends from Calico Rock, Arkansas, to the confluence of the White River with the Mississippi River north of Arkansas City, a distance of about 509 km. The specific gage approach was used to track hydrological response in the study reach. In order to approach spatial homogeneity across the four gaging locations along the study reach, input discharges were normalized to multiples of mean daily flow (MDF). Specific gage analysi

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3

Vecsei, Adam Vecsei Adam Vecsei Adam. "Aggradation und Progradation eines Karbonaplattform-Randes : Kreide bis Mittleres Tertiär der Montagna della Maiella, Abruzzen /." Zürich : [s.n.], 1991. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=9550.

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4

Clauson, Karen D. "Measuring Trends In Riverbed Gradation: A Lower Mississippi River Case Study." OpenSIUC, 2009. https://opensiuc.lib.siu.edu/theses/75.

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The trends of degradation and aggradation are measured in this study for the Lower Mississippi River. Historical riverbed elevation and stage data from the past hundred years were used from six gages in order to measure changes in riverbed gradation. It was found that using stage data to measure gradation changes is a superior method to using riverbed elevations, due to stage data’s reliability, length of record and daily measurements. Degradation in the Lower Mississippi River was seen during the

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5

Summa, Michelle Carlene. "Geologic Mapping, Alluvial Stratigraphy, and Optically Stimulated Luminescence Dating of the Kanab Creek Area, Southern Utah." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/506.

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At the turn of the century, Kanab Creek incised 30-meters into its alluvium, leaving behind fluvial terraces and thick basin fill sediments exposed along arroyo walls. Research objectives were to determine the timing and causes of past valley-filling and arroyo-cutting episodes along a 20 km-long reach of Kanab Creek in southern Utah. Fluvial deposits were mapped at the 1:12,000 scale and sediments were described and dated using Optically Stimulated Luminescence (OSL) and radiocarbon dating. The Kanab Creek valley can be divided into a narrow, upper terraced reach and a broad lower basin f

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6

Hodge, Joshua B. "Hurricane Storm Surge Sedimentation on the McFaddin National Wildlife Refuge, Texas: Implications for Coastal Marsh Aggradation." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849751/.

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This study uses the storm surge sediment beds deposited by Hurricanes Audrey (1957), Carla (1961), Rita (2005) and Ike (2008) to investigate spatial and temporal changes in sedimentation rates on the McFaddin National Wildlife Refuge in Southeast Texas. Fourteen sediment cores were collected along a transect extending from 90 to 1230 meters inland from the Gulf Coast. Storm-surge-deposited sediment beds were identified by texture, organic content, carbonate content, the presence of marine microfossils, and Cesium-137 dating. The hurricane-derived sediment beds are marker horizons that facilita

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7

Zuniga, David. "Flood dynamics, hazard and risks in an active alluvial fan system threatening Ciudad Juàrez Chihuahua Mexico." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/13049.

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The aim of this research is to assess hazards and risks associated with flooding in the city of Juárez, northern México, where there is a flood threat from active alluvial fans from mountains to the southwest and from the Rio Grande (Bravo River) to the northwest forming the northeast border of the city. Aims of this Ph.D. were addressed processing a digital elevation model (DEM) of the study area in a GIS platform to define the several alluvial fans, and thus to examine their history and palaeohydrology. Three OSL dates in the youngest parts of the fans show ages ranging from 74 - 31 ka. Howe

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8

Sheridan, Mattilda. "The effects of an Alpine Fault earthquake on the Taramakau River, South Island New Zealand." Thesis, University of Canterbury. Geology, 2014. http://hdl.handle.net/10092/10253.

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An Alpine Fault Earthquake has the potential to cause significant disruption across the Southern Alps of the South Island New Zealand. In particular, South Island river systems may be chronically disturbed by the addition of large volumes of sediment sourced from coseismic landsliding. The Taramakau River is no exception to this; located north of Otira, in the South Island of New Zealand, it is exposed to natural hazards resulting from an earthquake on the Alpine Fault, the trace of which crosses the river within the study reach. The effects of an Alpine Fault Earthquake (AFE) have been extens

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9

Fitzgibbon, Holly Ann. "Interpretation of Whether Incision Rates in Appalachian Karst Reflect Long-term Downcutting toward a Surface Versus Subsurface Base Level." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289851338.

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10

Denlinger, Emily E. "Contribution of Hurricane Ike Storm Surge Sedimentation to Long-term Aggradation of Coastal Marshes in Southeastern Texas and Southwestern Louisiana." Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc500114/.

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Coastal marshes and wetlands are vital natural resources that offer habitats for plants and animals, serve as ecological filtration for soil and water pollutants, and act as protection for coastlines. Fishing, both commercial and sport, has a large economic impact in the study area – the Gulf Coast between Galveston Bay, TX and Oak Grove, LA. The objective of this research was to determine the contribution of Hurricane Ike storm surge sedimentation to long-term marsh aggradation in Texas and Louisiana coastal marshes. The research hypothesized that Hurricane Ike’s storm surge deposit would

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11

Gulliford, Alice Rachel. "Controls on river and overbank processes in an aggradation-dominated system : Permo-Triassic Beaufort Group, South Africa." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/controls-on-river-and-overbank-processes-in-an-aggradationdominated-system-permotriassic-beaufort-group-south-africa(63893677-9b23-4f07-8405-627354fb170a).html.

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The Permo-Triassic lower Beaufort Group fluvial deposits extend over 100s of kilometres within the Karoo Basin, South Africa. A detailed study of the depositional architecture and stacking patterns of sand bodies within a 900 m thick succession has enabled interpretation of the controls on ancient river channel and overbank processes. Facies include very fine- to medium-grained sandstone, intra-formational conglomerate, mudstone and palaeosols. Channel-belts are dominated by upper flow regime structures, consistent with a flashy to ephemeral fluvial system. The overbank deposits comprise splay

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12

Elder, Ann Schaffer. "The Paleoecology and Geomorphology of Holocene Deposits of the Southern Malad River, Box Elder County, Utah." DigitalCommons@USU, 1992. https://digitalcommons.usu.edu/etd/6597.

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Widespread Lake Bonneville sediments have been modified by river aggradation and degradation associated with Holocene fluctuations in the Great Salt Lake. Exposures of exceptionally abundant and well-preserved molluscan deposits in the Bear River Valley, Utah, allow detailed paleoenvironmental reconstruction of Holocene environments. The exposed basal unit consists of largely unfossiliferous deltaic silts and clays deposited during Lake Bonneville time ( roughly 11,000 - 13,000 yr B. P.). An unconformity representing at least 2000 yr separates the deltaic material from overlying highly fossili

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13

Steffen, Damian. "Late Quaternary sediment aggradation and erosion in the Pisco and Majes valleys in southern Peru : the role of climatic variations /." [S.l.] : [s.n.], 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000286559.

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14

Major, Josef. "Controls on mid-Holocene fringing reef growth and termination in a high latitude, estuarine setting, Wellington Point, Southeast Queensland." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/63964/1/Josef_Major_Thesis.pdf.

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Several fringing coral reefs in Moreton Bay, Southeast Queensland, some 300 km south of the Great Barrier Reef (GBR), are set in a relatively high latitude, estuarine environment that is considered marginal for coral growth. Previous work indicated that these marginal reefs, as with many fringing reefs of the inner GBR, ceased accreting in the mid-Holocene. This research presents for the first time data from the subsurface profile of the mid-Holocene fossil reef at Wellington Point comprising U/Th dates of in situ and framework corals, and trace element analysis from the age constrained carbon

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15

Hughes, Matthew William. "Late Quaternary Landscape Evolution and Environmental Change in Charwell Basin, South Island, New Zealand." Phd thesis, Lincoln University. Agriculture and Life Sciences Division, 2008. http://theses.lincoln.ac.nz/public/adt-NZLIU20080214.132530/.

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Charwell Basin is a 6 km-wide structural depression situated at the boundary between the axial ranges and faulted and folded Marlborough Fault Zone of north-eastern South Island, New Zealand. The basin contains the piedmont reach of the Charwell River, and a series of late Quaternary loess-mantled alluvial terraces and terrace remnants that have been uplifted and translocated from their sediment source due to strike-slip motion along the Hope Fault which bounds the basin to its immediate north. The aim of this study was to provide an interdisciplinary, integrated and holistic analysis of late

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16

Burn, Christopher Robert Carleton University Dissertation Geology. "On the aggradational ice in permafrost." Ottawa, 1986.

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17

Hughes, Matthew W. "Late Quaternary landscape evolution and environmental change in Charwell Basin, South Island, New Zealand." Lincoln University, 2008. http://hdl.handle.net/10182/305.

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Abstract (sommario):

Charwell Basin is a 6 km-wide structural depression situated at the boundary between the axial ranges and faulted and folded Marlborough Fault Zone of north-eastern South Island, New Zealand. The basin contains the piedmont reach of the Charwell River, and a series of late Quaternary loess-mantled alluvial terraces and terrace remnants that have been uplifted and translocated from their sediment source due to strike-slip motion along the Hope Fault which bounds the basin to its immediate north. The aim of this study was to provide an interdisciplinary, integrated and holistic analysis of late

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18

Franzoia, Mariateresa. "Sediment yield in rivers at different time-scales." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423550.

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The present thesis is devoted to a particular topic regarding the fluvial sub-systems, namely the evaluation of the annual amount of sediment yield through a given cross-section of a river. This problem has been largely investigated in literature and the resulting models can be classify in different groups depending on the morphological characteristics they take into account and their complexity. In any case the large quantity of data required is always the main problem. With this work we want to find simple relationships that require the lesser number of data as possible, so we have made our

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19

Brivio, Lara. "Morphodynamic evolution of meandering channels in tidal landscapes: sedimentology and stratal architecture." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3427220.

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Meandering channels constitute one of the fundamental components of tidal systems, as related tidal point bars are ubiquitous features in lagoonal or estuarine sedimentary successions. Nevertheless, a limited number of studies analyzed their morphodynamic evolution, together with their planimetric shape and morphometric characteristics. Their internal architecture and sedimentary facies distribution are relatively unexplored, and commonly investigated using facies models developed for fluvial meander bends. Focusing on differences, more than on similarities, between tidal and fluvial meander

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20

Cosma, Marta. "Stratal patterns and sedimentary facies in tidal point bars." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3422690.

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Tidal channels play a key role in the evolution of coastal environments and commonly dominate tidal landscapes. These channels commonly show a clear meandering pattern which shapes the architectural geometries of sedimentary successions accumulated in tidal coastal realms. Nevertheless, a limited number of studies analysed the morphodynamic evolution of tidal meanders and the related point bar sedimentary bodies, whose internal architecture and sedimentary facies distribution remain still poorly explored, as highlighted by their scarce documentation in the rock record. The capability of readin

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21

Chern, Peter Kyaw Zaw Naing. "Patterns of coal sedimentation in the Ipswich Basin Southeast Queensland." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15924/1/Peter_Chern_Thesis.pdf.

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The intermontane Ipswich Basin, which is situated 30km south-west of Brisbane, contains coal measures formed in the Late Triassic Epoch following a barren non-depositional period. Coal, tuff, and basalt were deposited along with fluvial dominated sediments. The Ipswich Coal Measures mark the resumption of deposition in eastern Australia after the coal hiatus associated with a series of intense tectonic activity in Gondwanaland during the Permo-Triassic interval. A transtensional tectonic movement at the end of the Middle Triassic deformed the Toogalawah Group before extension led to t

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22

Chern, Peter Kyaw Zaw Naing. "Patterns of Coal Sedimentation in the Ipswich Basin Southeast Queensland." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15924/.

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Abstract (sommario):

The intermontane Ipswich Basin, which is situated 30km south-west of Brisbane, contains coal measures formed in the Late Triassic Epoch following a barren non-depositional period. Coal, tuff, and basalt were deposited along with fluvial dominated sediments. The Ipswich Coal Measures mark the resumption of deposition in eastern Australia after the coal hiatus associated with a series of intense tectonic activity in Gondwanaland during the Permo-Triassic interval. A transtensional tectonic movement at the end of the Middle Triassic deformed the Toogalawah Group before extension led to the for

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23

Lin, Chen Wen, and 陳文玲. "A study on channel aggradation using multimode characteristics thod." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/64176601139577055825.

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碩士<br>國立交通大學<br>土木工程研究所<br>82<br>The purpose of this study is to develop a numerical model based on multimode characteristics method for fully coupled simulation of water and sediment movement in mobile-bed alluvial channels with nonuniform bed materials. According to multimode characteristics method, the characteristics equations and tota- -lly differential compatible equations of the numerical model could be obtained by consolidating water continuity and momen- -tum equations, sediment co

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24

CAI, BO-QI, and 蔡柏棋. "Simulation of degradation and aggradation of river bed below reservoir." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/28866477569361538973.

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25

Daniels, J. Michael. "Gully erosion and valley aggradation in the upper Republican River basin, Nebraska." 2002. http://www.library.wisc.edu/databases/connect/dissertations.html.

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26

Lin, JenYing, and 林任應. "Laboratory Experiments of Sorting Phenomenon for Nonuniform Gravel during Channel Aggradation and Degradation." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/44136351459935530179.

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碩士<br>國立中興大學<br>土木工程學系<br>89<br>The evolution of the river bed profile is related to the mechanism of sediment transport, including the interaction of flow and sediment. Therefore, the estimation of the sediment transport rate is very important for the watershed management, the clearance of reservoir sedimentation, and the soil and water conservation. In this study, a series of laboratory experiment is performed to investigate the transport characteristics of non-uniform gravel for steep channels in Taiwan. Both the particle size distribution and flow discharge were fixed, and four

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27

Chen, Pin-Fan, and 陳品帆. "Influence of Wash Load Estimation on River Degradation / Aggradation in Chou-Shui Watershed." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/b5zwtr.

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碩士<br>國立交通大學<br>土木工程系所<br>105<br>Unlike the achievement of bed material load estimation in laws of physics and numerical models in river channels in Taiwan, wash load estimation is rarely mentioned. Lacking of fundamental data in the past, wash load has been generally assumed as composed of 70% to 90% suspend load in the river, there are no clear standard of specified particle size and division method in different river,so overestimation or underestimation of sediment transport occurs frequently with inaccurate wash load proportion. This study aims at developing a relationship of the proportio

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28

Chen, Chen-Hua, and 陳振華. "A Study on Nonuniform-Sediment Channels Degradation and Aggradation of Using Mutimode Characteristics Method." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/40185775928967452982.

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碩士<br>國立交通大學<br>土木工程學系<br>84<br>This study, based on the coupled nonuniform-sediment multimode characteristics model developed by Li (1992), Chen (1994), and Tsang (1995), conducts simulations under the condition of alternating aggradation and degradation of the channel beds. The model used previously has a shortcoming of failing to meet the law of mass conservation due to the sudden change of hydraulic conditions. To avoid this shortcoming, the numerical method adopted in this study comput

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29

Newlin, Jessica T. "Sediment aggradation at bridge crossings and an adaptive approach to stream channel maintenance and bridge design." 2007. http://www.etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2367/index.html.

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30

Burri, Nicole M. "Depositional slope surface of the western margin of the Nylsvlei, South Africa : active piedmont aggradation and sedimentation processes." Thesis, 2014.

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The Nyl River and its floodplain are situated on the eastern foothills of the Waterberg mountain range in the Limpopo Province of South Africa. Tributaries flowing out of the Waterberg range display unusual downstream changes, as they approach and converge with the Nylsvlei (or Nyl floodplain). Tributary channels decrease in size downstream until, eventually, they disappear altogether forming unchannellized floodouts. On one such floodout, on the farm Driefontein, an actively aggrading piedmont has formed adjacent to the famous Wonderkrater peat mound, known for its pollen record dating back ~

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31

Petter, Andrew Lucas 1980. "Stratigraphic implications of the spatial and temporal variability in sediment transport in rivers, deltas and shelf margins." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-880.

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Sediment delivery to a basin exerts a first-order control over sedimentation, and therefore study of sedimentary rocks can reveal information about the nature of sediment delivery in the past. This dissertation examines several aspects of this problem using experimental, outcrop, and subsurface data. Flume experiments were undertaken to test the combined effects of autogenic alluvial aggradation and forced regression on the development of fluviodeltaic stratigraphy. Alluvial aggradation occurred in response to steady relative sea-level fall, and eventually consumed the entire sediment budget a

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32

Veillette, Audrey. "Stabilisation du paysage périglaciaire suite à un épisode de ravinement par thermo-érosion : implication pour la structure et la stabilité thermique du pergélisol de surface." Thèse, 2019. http://hdl.handle.net/1866/22507.

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