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Sediment transport in sandy estuarie...
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Alkhalidi, Mohamad.
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Sediment transport in sandy estuaries at equilibrium.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Sediment transport in sandy estuaries at equilibrium./
作者:
Alkhalidi, Mohamad.
面頁冊數:
194 p.
附註:
Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3350.
Contained By:
Dissertation Abstracts International66-06B.
標題:
Engineering, Marine and Ocean. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3177941
ISBN:
9780542177668
Sediment transport in sandy estuaries at equilibrium.
Alkhalidi, Mohamad.
Sediment transport in sandy estuaries at equilibrium.
- 194 p.
Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3350.
Thesis (Ph.D.)--University of Florida, 2005.
Estuaries tend toward equilibrium morphology over a suitably long term, and when they are perturbed directly or indirectly by human interference or natural changes, sedimentary disequilibrium occurs. As result the morphology changes, with consequent impacts that may be potentially adverse to estuarine health. Therefore, as a starting point of understanding such impacts, it is essential to examine the conditions for sedimentary equilibrium in estuaries laden with sedimentary material. These conditions and the contribution of (non-cohesive) sediment load components to achieve equilibrium are the focus of this study.
ISBN: 9780542177668Subjects--Topical Terms:
1019064
Engineering, Marine and Ocean.
Sediment transport in sandy estuaries at equilibrium.
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Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3350.
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Estuaries tend toward equilibrium morphology over a suitably long term, and when they are perturbed directly or indirectly by human interference or natural changes, sedimentary disequilibrium occurs. As result the morphology changes, with consequent impacts that may be potentially adverse to estuarine health. Therefore, as a starting point of understanding such impacts, it is essential to examine the conditions for sedimentary equilibrium in estuaries laden with sedimentary material. These conditions and the contribution of (non-cohesive) sediment load components to achieve equilibrium are the focus of this study.
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A key feature of equilibrium estuaries is the relationship between the flow cross-sectional area and the tidal prism. The Einstein-Brown bed-load equation, which is based on the basic concept of live-bed sedimentary equilibrium, is shown to be reasonable for prediction of total load under steady flows. This equation is therefore selected to derive a new area-prism "regime" equation for the three reaches of the estuary: the entrance, the mixing zone and the tidal river, considering the latter to be part of the estuarine tidal system. Using available data it is shown that the new equation is applicable to these reaches, thus justifying its use in modeling sediment transport in such systems.
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For sediment transport, the following components are shown to be important: net load due to tidal asymmetry, that due to Stokes drift and that due to river discharge. By introducing the Einstein-Brown equation in an existing numerical code for hydrodynamics and non-cohesive sediment transport, these load components are calculated for sand transport in the micro-tidal Loxahatchee estuary in southern Florida. It is found that three components, i.e., the loads due to tidal asymmetry, Stokes drift and river discharge, reasonably balance in the lower portion of the estuary. This finding corroborates the observation for this low-energy estuary based on a macroscopic sediment budget that it is in fact nearly in sedimentary equilibrium.
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In future, the developed sediment balance needs to be tested directly against field data on total sediment load. Also, it may be tested for estuaries with high suspended-load to assess its ability to predict net sediment transport in high-energy tidal systems. The sediment balance analysis can be improved by including the effect of sea level rise, especially when considering very long term morphologic changes.
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3177941
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