Sediment transport, turbidity, and dissolved oxygen responses to annual streambed drawdowns for downstream fish passage in a flood control reservoir

2021 ◽  
Vol 295 ◽  
pp. 113068
Author(s):  
Liam Schenk ◽  
Heather Bragg
Keyword(s):  
Sediment Transport ◽  
Dissolved Oxygen ◽  
Flood Control ◽  
Fish Passage

Simulation Study on Deposition Downstream Floodgates in Estuarine

2014 ◽  
Vol 580-583 ◽  
pp. 2037-2040
Author(s):  
Xin Zhou Zhang ◽  
Yin Yan Song ◽  
Shao Ming Chen
Keyword(s):  
Sediment Transport ◽  
Numerical Model ◽  
Discharge Capacity ◽  
Simulation Study ◽  
Theoretical Basis ◽  
Flood Control ◽  
Tidal Wave ◽  
Dynamic Factor ◽  
Lower Reach ◽  
Wave Deformation

Siltation in the rivers downstream of floodgates is serious in China, making the discharge capacity of rivers decrease obviously and threatening the flood control in upper rivers. Tidal wave deformation is one conclusive dynamic factor leading to siltation downstream of floodgates in estuaries. A 2-D numerical model of tide and sediment transport is established to simulate the distribution of sediment siltation downstream of the floodgate, and several conclusions are obtained in this paper which can provide some theoretical basis for the prediction and analysis of the siltation characteristics in lower reach caused by floodgates in estuaries.

scholarly journals Critical dependence of morphodynamic models of fluvial and tidal systems on empirical downslope sediment transport

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
A. W. Baar ◽  
M. Boechat Albernaz ◽  
W. M. van Dijk ◽  
M. G. Kleinhans
Keyword(s):  
Sediment Transport ◽  
Morphological Change ◽  
Flood Control ◽  
Morphological Development ◽  
Channel Incision ◽  
Critical Knowledge ◽  
Model Interpretation ◽  
Gravity Driven ◽  
Channel Patterns ◽  
Change Mitigation

Abstract The morphological development of fluvial and tidal systems is forecast more and more frequently by models in scientific and engineering studies for decision making regarding climate change mitigation, flood control, navigation and engineering works. However, many existing morphodynamic models predict unrealistically high channel incision, which is often dampened by increased gravity-driven sediment transport on side-slopes by up to two orders of magnitude too high. Here we show that such arbitrary calibrations dramatically bias sediment dynamics, channel patterns, and rate of morphological change. For five different models bracketing a range of scales and environments, we found that it is impossible to calibrate a model on both sediment transport magnitude and morphology. Consequently, present calibration practice may cause an order magnitude error in either morphology or morphological change. We show how model design can be optimized for different applications. We discuss the major implications for model interpretation and a critical knowledge gap.

Analysis and numerical simulation of natural and human-caused low dissolved oxygen in the Minjiang River Estuary

2016 ◽  
Vol 73 (10) ◽  
pp. 2475-2485 ◽  
Author(s):  
Peng Zhang ◽  
Yong Pang ◽  
Chengchun Shi ◽  
Yishu Wang ◽  
Lei Xu ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
River Discharge ◽  
Flood Control ◽  
Nutrient Loading ◽  
River Estuary ◽  
Water Age ◽  
Drought Period ◽  
Minjiang River

The Minjiang River, a typical tidal channel in Southeast China, plays an important role in the supply of drinking water, flood control and drought relief, farming and navigation, as well as shipping and other functions. Dissolved oxygen (DO), as a basic living condition for aquatic biota, has been deteriorating in the Minjiang River in recent years. In order to understand how the spatial distribution of DO responds to river discharge, nutrient loading and water temperature, a three-dimensional Environmental Fluid Dynamics Code model was used to simulate water age and the distribution of DO in the Minjiang River. The model presented in this paper was used for water resource and water quality simulations under various physical, chemical, and biological scenarios. Sensitivity simulation results indicated that the three factors had a significant impact on the spatial distribution variation of DO in the Minjiang River. Increased river discharge or split ratio of the North Channel resulted in decreased water age and increased DO. Increased nutrient loading and water temperature caused lower DO. In order to protect coastal environments in the Minjiang River, river discharge should be increased and pollutants of local cities should be reduced during the high temperature and drought period.

scholarly journals Spatial analysis of American Eel (Anguilla rostrata), fish passage and land use in Chesapeake Bay tributaries

2020 ◽  
Author(s):  
Nicholas J. Walker ◽  
V. Prasad ◽  
K. de Mutsert ◽  
C.A. Dolloff ◽  
A.A. Aguirre
Keyword(s):  
Land Use ◽  
Spatial Analysis ◽  
Chesapeake Bay ◽  
Flood Control ◽  
Fish Passage ◽  
Control Measures ◽  
Anguilla Rostrata ◽  
Sampling Effort ◽  
American Eel ◽  
Density Data

AbstractCatadromous eels are found in more habitats than any other fish and are capable of inhabiting marine, brackish and freshwater environments. In this study we used the American Eel (Anguilla rostrata) as a bioindicator organism to create a novel method of using spatial analysis to study species conservation over landscape scales. We built a model of the subwatersheds of the Chesapeake Bay using a Digital Elevation Model (DEM) and overlaid eel density data (> 1 million eels sampled), dam density data and land use in ArcGIS. Dam construction in the study area peaked between 1955 and 1975, possibly as a result of flood control measures. Effects of land use were localized and most pronounced in areas around Baltimore, Maryland, Washington, D.C. and Richmond, Virginia, USA. Results indicate the Potomac and Rappahannock rivers appear to be areas of lesser concern while the upper James and York rivers are ideal for follow-up studies, since these area rank poorly in both eel density and barriers to fish passage. Because these rivers have high eel density downstream, the dams appear to be the limiting factor. Sampling methods have been inconsistent over time, making it is difficult to determine where eel densities are low vs. the area having had little sampling effort. This is partially resolved with catch per sampling event (CPSE), which appears to show a relationship between eels sampled and the number caught per sample. Potential strategies for improving watersheds include dam removal, fish passage and habitat restoration.

scholarly journals Estimasi Volume Sedimentasi Waduk Sermo Menggunakan Metode RUSLE, Batimetri dan Angkutan Sedimen

2020 ◽  
Vol 3 (1) ◽  
pp. 39
Author(s):  
Annisa Wulandari ◽  
Bambang Kun Cahyono
Keyword(s):  
Sediment Transport ◽  
Catchment Area ◽  
Flood Control ◽  
Volume Estimation ◽  
Rainfall Erosivity ◽  
Water Runoff ◽  
Water Catchment Area ◽  
Sediment Volume ◽  
Water Catchment ◽  
Precision Test

Sermo Reservoir is a reservoir which was built by Indonesian Government and supported by Asian Development Bank in program Integrated Irrigation Sector Project (IISP) in 1996. Sermo Reservoir functions as a flood control, raw water source and irrigation. Changes that occur to water catchment area of the Sermo Reservoir affects its condition. Especially changes that occur in aspects of water runoff, sediment production and watershed deposition of watershed aspects which are caused by erosion in water catchment area resulting in sedimentation. Long term sedimentation causes a decrease in reservoir capacity. To overcome this problem it is necessary to estimate the sedimentation volume to determine the latest condition of the Sermo Reservoir. In this activity, volume estimation of sedimentation was conducted using RUSLE, bathymetry and sediment transport methods. The data used in this activity are the data in 2016, 2017 and 2018. In this activity, the analysis of the RUSLE method in the Ngrancah Watershed includes the factors of rainfall erosivity, soil erodibility, length and slope and land cover and preservation. In addition to RUSLE, an analysis was carried out using the bathymetry method. This method calculates sedimentation based on reservoir baseline DTM data of 2017 and 2018. From the difference between both DTM epochs, obtained sediment volume and spread of Sermo Reservoir. Besides, analysis of the sediment transport method was conducted using water soil content data of 2016 which is assumed static until 2018. While analyzing with RUSLE, bathymetry and sediment transport methods using ArcGIS Software. The results of volume estimation of sedimentation using RUSLE, sediment transport and bathymetry consecutively yields 184.158,580 m3/year, 163.151,173 m3/year and 149.959,800 m3/year. Thus the estimation results of sediment thickness velocity of Sermo Reservoir using RUSLE, bathymetry and sediment transport are 8,687 mm/year, 7,790 mm/year and 7,074 mm/year. Generated volume from the methods was tested by using precision test yielding RSD 8,407 % thus classified as low accuracy. From the precision test can be concluded that sediment transport was the most precise because it has a percentage difference of -0,766 % of the average sediment volume.

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