sediment load Articles
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Modal analysis of annual runoff volume and sediment load in the Yangtze river-lake system for the period 1956–2013
This study focuses on detecting trends in annual runoff volume and sediment load in the Yangtze river-lake system. Times series of annual runoff volume and sediment load at 19 hydrological gauging stations for the period 1956–2013 were collected. Based on the Mann-Kendall test at the 1% significance level, annual sediment loads in the Yangtze River, the Dongting Lake and the Poyang Lake were ...
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Sediment load prediction by combined fuzzy logic-wavelet method
Sediment load prediction is very important in planning, operation, and maintenance of water structures located on rivers. The sediment loads exhibit random characteristics due to the uncertain nature of sediment transportation in rivers. To predict suspended sediment load, stochastic processes, regression methods, neural network models, and fuzzy logic have been used in the literature so far. ...
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Estimating soil loss from two coastal watersheds in Puerto Rico with RUSLE
The loss of topsoil from the landscape increases sediment loading to adjacent aquatic systems, which may be transported further downstream. Increased sediment loading to downstream ecosystems such as estuaries can negatively impact these environments. This research compares the sediment loss from two watersheds [Jobos Bay (JB) and Rio Espiritu Santo (RES) watersheds] on the island of Puerto Rico. ...
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Assessment of suspended sediment concentration and load from a large Himalayan glacier
An assessment of suspended sediment concentration (SSC), load, yield and erosion rate has been undertaken for the Gangotri Glacier drainage basin (nearly 50% glaciated) located in the Garhwal Himalayas. Data were collected for four ablation seasons (2008–2011). Mean monthly SSCs, for May, June, July, August and September during the study period was 1,011, 1,384, 1,916, 1,675 and ...
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Responses of streamflow and sediment load to climate change and human activity in the Upper Yellow River, China: a case of the Ten Great Gullies Basin
Soil erosion and land desertification are the most serious environmental problems globally. This study investigated the changes in streamflow and sediment load from 1964 to 2012 in the Ten Great Gullies area of the Upper Yellow River. Tests for gradual trends (Mann–Kendall test) and abrupt changes (Pettitt test) identify that significant declines in streamflow and sediment load occurred ...
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Impacts of Danjiangkou reservoir on sediment regime of the Hanjiang River
With population increase and economic growth, the development of water resources and hydropower resources of the Hanjiang River has been intensified by dam building, and consequently the sediment regime of the Hanjiang River has been altered to some extent. To assess dam-induced alterations in the sediment regime of the Hanjiang River quantitatively, we selected three key hydrological stations ...
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Eglin air force base roadway, Eglin AFB, Florida
The Presto Geosystems Geoweb® Load Support System provided a low-maintenance, permeable load-support roadway through the air force base grounds. The gravel-filled roadway, measuring 30 ft. wide and 4,000 ft. long, replaced a dirt road that had experienced significant sediment loss into a nearby creek from washout. The environmental impact of the increased sediment load endangered the protected ...
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Modeling streamflow and sediment responses to climate change and human activities in the Yanhe River, China
Quantifying the impact of climate change and human activities on hydrological processes is of great importance for regional water-resource management. In this study, trend analysis and analysis of the short-term variations in annual streamflow and sediment load in the Yanhe River Basin (YRB) during the period 1972–2011 were conducted using linear regression and the Pettitt test. The Soil and ...
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The impact of digital elevation model and land use spatial information on Hydrologic Simulation Program-FORTRAN – predicted stream flow and sediment uncertainty
The Hydrologic Simulation Program-FORTRAN (HSPF) model is widely used to develop management strategies for water resources. The spatial resolution of the input data used to parameterize the HSPF model may lead to uncertainty in model outputs. In this study, we evaluated the impact of the spatial resolution of the digital elevation model (DEM) and land use data on uncertainty in HSPF-predicted ...
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Experimental study of pollutant washoff on a full-scale street section physical model
This study analyses the mobilization of total suspended solids (TSS) for different spatial distributions of sediment load located over the roadway surface of a full-scale street section physical model. At the sewer network outlet, flow discharges were measured and TSS pollutographs were determined with manual grab samples and inferred from turbidity records. In all the tests, the rain ...
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Evaluation of AnnAGNPS and its applications in a semi–arid and semi–humid watershed in Northwest China
The main goal of this study was to evaluate the performance of AnnAGNPS (Annualised Agricultural Non–Point Source Pollution Model) in simulating runoff, sediment loading and nutrient loading in a semi–arid and semi–humid watershed of an area of 1481sq km, located in Northwest China. This model was first calibrated and tested by historic monitoring data and then the validated model was used to ...
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Estimating quantiles of annual maximum suspended sediment load in the tributaries of the Lower Mekong River
Sediment is an important factor involved in sustainable development of water resources systems. Suspended sediment is a major portion of total load transported by streams. Quantification of annual maximum suspended sediment load (SSLm) and its quantiles (SSLm*) is the basic requirement for planning, design and management of hydraulic structures and water resources-related projects. Less ...
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Use of principal component analysis in conjunction with soft computing methods for investigating total sediment load transferability from laboratory to field scale
This study quantitatively investigates the generalization from laboratory scale to field scale using the soft computing (expert) and the empirical methods. Principal component analysis is utilized to form the input vector for the expert methods. Five main dimensionless parameters are used in the input vector of artificial neural networks (ANN), calibrated with laboratory data, to predict field ...
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Comparative evaluation with the analytical hierarchy procedure of the Kalinske, Brooks, and Toffaleti equations used to estimate suspended–sediment discharges in rivers
This paper presents a comparative analysis of the application of the analytical hierarchy process (AHP) to determine the reliability of three equations used estimate suspended–sediment discharges at the Armand River in Iran. The AHP procedure was utilised to compare the discharges of suspended sediments measured at a station on the Armand River with results calculated with the equations derived ...
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Modelling a turbidity current in Soyang reservoir (Korea) and its control using a selective withdrawal facility
Persistent turbidity in reservoirs and their downstream after flood events is one of most important environmental issues in Korea. Recently, modification of withdrawal facility and installation of a new selective withdrawal structure (SWS) have been implemented for the mitigation of downstream impact and sediment loading into water treatment facilities. This study was to explore the ...
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Numerical assessment of bed-load discharge formulations for transient flow in 1D and 2D situations
Two-dimensional (2D) transient flow over an erodible bed can be modelled using shallow-water equations and the Exner equation to describe the morphological evolution of the bed. Considering the fact that well-proven capacity formulae are based on one-dimensional (1D) experimental steady flows, the assessment of these empirical relations under unsteady 1D and 2D situations is important. In order ...
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Using sediment particle size class analysis to better understand urban land-use effects
Abstract A nested-scale experimental watershed study design was used to demonstrate rainfall-runoff and sediment particle size class variability in a representative urbanizing watershed in central Missouri USA. On average, sediment particle size classes were almost twice as large (2.0 to 500um size range) in headwaters, relative to an urban setting. Eighty percent of total sediment in the ...
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Combined effects of nutrient enrichment and inorganic sedimentation on benthic biota in an experimental stream system
Sedimentation and nutrient loading are among the most prevalent threats to fluvial ecosystem integrity. This study employed artificial streams (mesocosms) to simulate individual and combined impacts of nutrient enrichment and deposited fine sediment on benthic biota. Ninety-six circular mesocosms were used in a 21-day crossed experiment that measured the impact of three substrate compositions ...
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Sea wave propagation from offshore to Maputo's coast. Application to longshore sediment transport assessment
This study aims to characterize the wave climate near the coastal region of Maputo (Mozambique), and to provide a first assessment of the sediment transport load in this area. A time-series of 13 years' worth of offshore wave data, obtained from reanalysis products, was propagated to the coast. Wave propagation was performed using Linear Wave theory and the numerical model, Simulating ...
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Tools for monitoring distribution system water quality: a study using four parallel pilot systems
Monitoring and understanding water quality changes within the distribution system is essential to enable effective management to provide good quality water at the customer tap. A recent 2-year study utilised four parallel pilot distribution systems (PDS) and a range of simple tools to assess the impact improving treatment had on the water quality within the distribution system. Particle ...
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