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Siltation

About: Siltation is a research topic. Over the lifetime, 1420 publications have been published within this topic receiving 20983 citations.


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01 Jan 1999
TL;DR: In this paper, the Modified Universal Soil Loss Equation (MUSLE) is used to estimate the instantaneous discharge entering into a reservoir and to obtain the flood parameters required by MUSLE.
Abstract: Williams proposed in' 1975 an equation derived from the Universal Soil Loss Equation (USLE) and adapted it to runoff models. This equation,called the Modified Universal Soil Loss Equation (MUSLE) requires flood parameters: peak of discharge, flow volume, and four parameters describing soil loss ability. These parameters are defined for standard runoff plots and may be extrapolated to small watersheds according to topography, soil, and land use and vegetation maps. Several methods are proposed in the literatureto estimate these parameterswith betteror less precision. Usinga water balance model, it is possible to estimate the instantaneous discharge entering into a reservoir and to obtain the flood parameters required by MUSLE. Other parameters necessary for using USLE are: • K measures the resistance of the soil to erosion, it depends on the soil composition, percentage oforganic matter, structure, permeability, and of different ratios: fine sand, loam, clay, and stones. • LS comprehends land erodibiJity linked to relief, it depends of the length and the inclination of the slopes. • C is defined as the ratio between the soil losses observed in two standard plots for the same soil, the first plot is cultivated, the second is bare; C varies between 0 and I during the year. • P is a coefficient between 0 and 1 expressing erosion reduction to soil conservation practices. In a first' stage, these parameters were considered constant for the watershed and the MUSLE is computed by an optimization method. The total amount of soil losses during the floods are added and the result is compared to observed dam siltation. In a second stage, the parameters were estimated with fuzzy logic.

4 citations

Patent
28 Sep 2016
TL;DR: In this paper, a method for promoting siltation and sand consolidation on a beach by utilizing natural energy, and belongs to a coastal reclamation technology in coastal engineering, is described.
Abstract: The invention discloses a method for promoting siltation and sand consolidation on a beach by utilizing natural energy, and belongs to a coastal reclamation technology in coastal engineering. The method comprises the following steps: investigation, geological survey, design planning, damming and sluice-building, siltation promotion and water drainage, and mud conveying and sand consolidation. The method is characterized in that sediment deposition is promoted by utilizing natural energy of tides according to the principle of adjusting measures to local conditions and making the best use of the circumstances. Clearance electric energy of a plurality of pieces of power generating equipment is collected to establish a natural energy power station for supplying power to sediment conveying equipment. Sand consolidation is carried out by adopting methods of filling geotextile bags, mixing with a dehydrating hardening agent and biologically hardening. The method has the characteristics of adopting a multi-point formation process, being gradually expanded, being green and low-carbon, being energy-saving and environmentally-friendly, and being remarkable in benefit. Moreover, materials are saved, energy consumption is reduced and labor power is saved, so that the method is green and environmentally-friendly, and is safe and reliable. The method is used for dissipating waves, promoting siltation, consolidating sand and protecting a slope, so that irregular accumulation of sediments is improved, beach elevation is improved, a large number of land resources are obtained, and ecological balance is kept.

4 citations

Journal Article
TL;DR: The Universal Soil Loss Equation (USLE) was developed in order to predict soil loss averages over long periods and conditions as discussed by the authors, and the aim of this study was to apply the USLE in the Marrecas basin to estimate the generation of sediment through laminar erosion.
Abstract: The reservoir silting is directly related to soil erosion and the greater the amount of sediment contributed to its interior, lower storage capacity and therefore lifetime Since it is very expensive to monitor erosion throughout the watershed, it is common the use of mathematical modeling The Universal Soil Loss Equation (USLE) was developed in order to predict soil loss averages over long periods and conditions The aim of this study was to apply the USLE in the Marrecas’ basin to estimate the generation of sediment through laminar erosion The USLE calculation was accomplished through the use of GIS (Geographic Information System) The results indicate that the study watershed has a low generation of sediment by laminar erosion, with most of its length inserted into classes with very low to low soil loss The use of Geographic Information Systems (GIS), coupled with Remote Sensing and Digital Cartography, allow obtaining the factors that make up the USLE, enabling the generation of spatial analysis of sediments in the basin, supporting the selection of conservation practices

4 citations

Journal Article
TL;DR: In this article, the situation of siltation and erosion in different districts of tidal flat in Shanghai and the relationship among the exploitation and ulitization of the tidal flat, wetland protection, and waterways regulation are analyzed.
Abstract: Recent years the quantity of fluvial sediments into the sea has been reduced due to the building of dams in the main stream and tributaries of the upper Changjiang River,especially the building of the Three Gorge dam.This will result in the decrease of deposition rate of tidal flat and the increase of the length of the erosion shore.This paper analyses the situation of siltation and erosion in different districts of tidal flat in Shanghai and the relationship among the exploitation and ulitization of tidal flat,wetland protection,and waterways regulation.It also provides the key points in conducting siltation and reclamation in different districts of tidal flat.It is suggested that the current good opportunity should be grasped to enhance the exploitation in the middle and lower tidal flat.

4 citations

Journal ArticleDOI
18 Oct 2012
TL;DR: Wang et al. as mentioned in this paper combined the feasibility study of a tidal gate at Mulanxi River, a physical model and 3D numerical model of sediment siltation downstream gate are conducted.
Abstract: In order to resist tides and salt intrusion, there have been more than 300 tidal gates built at many river estuaries in China since 1960s. However, the serious deposition occurred at a lot of gates due to the changes of hydrodynamic and sediment conditions and lack of discharge from the rivers. At present, the research is mainly to analyze the reasons for siltation downstream gates and the measures of dredging. It is not enough for study on distribution simulation of deposition downstream sluice. Studies have shown that 2D numerical model cannot reflect the distribution of sediment siltation downstream gates. Therefore, it needs to develop 3D sediment numerical model for deposition prediction. In this paper, combined the feasibility study of a tidal gate at Mulanxi River, a physical model and 3D numerical model of sediment siltation downstream gate are conducted.

4 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023122
2022214
202159
202072
201964
201871