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Spatial and temporal variability of suspended sediment in low mountain range Gersprenz basin

Scholand, Dominik and Schmalz, Britta (2018):
Spatial and temporal variability of suspended sediment in low mountain range Gersprenz basin.
In: 17th Biennial Conference ERB2018 (Euromediterranean Network of Experimental and Representative Basins), Darmstadt, 11.-14.09.2018, [Online-Edition: http://erb-network.simdif.com/],
[Conference or Workshop Item]

Abstract

The majority of solids in running watersdriftsfrom the surface of the catchment areas in the form of suspended sediment. Due to local settling of particles in the waterways as a result of flood events,a sediment management system is required. Furthermore, the suspended sediment transport in rivers is often linked to the transport of nutrients and pollutants, which stick to the fine-grained particles. This is an important reason for sediment monitoring and estimating loads. The base of monitoring is field-measurement. Direct measurement methods for defining the concentration of suspended sediment in rivers are very time consuming (and expensive). Depending on the cross-sectional geometry, it is required to take a certain number of samples from the water to examine the solids afterwards. Analyzing individual flood events, the number of samples and thus the expenditure of time for sampling and evaluation highly increases. An alternative is an indirect (optical) measuring method, such as turbidity measurement, to get a continuous time series. The aim of the study is to investigate the transport processes and drivers in the low mountain range Gersprenz catchment area (485 km²) including its small subbasin Fischbach (37 km²) combining direct and indirect measurement methods as well as identifying the sources and entry pathways of the suspend solids. Different empirical approaches were used to interpret the transport dynamics on various time-scales. In the analysis of temporal variability, the time-scale in particular individual events as well as seasonal differences should be considered. Our results show the evaluation of the influence of different field parameters like land use, slope, soil or hydro-meteorological factors on hysteresis loops and sediment rating curves. However, we accounted also the spatial variability of the measured values, both in the cross-section and along the watercourse, to regard the hydraulic parameters of the channel (discharge, depth, velocity, stream bed).

Item Type: Conference or Workshop Item
Erschienen: 2018
Creators: Scholand, Dominik and Schmalz, Britta
Title: Spatial and temporal variability of suspended sediment in low mountain range Gersprenz basin
Language: English
Abstract:

The majority of solids in running watersdriftsfrom the surface of the catchment areas in the form of suspended sediment. Due to local settling of particles in the waterways as a result of flood events,a sediment management system is required. Furthermore, the suspended sediment transport in rivers is often linked to the transport of nutrients and pollutants, which stick to the fine-grained particles. This is an important reason for sediment monitoring and estimating loads. The base of monitoring is field-measurement. Direct measurement methods for defining the concentration of suspended sediment in rivers are very time consuming (and expensive). Depending on the cross-sectional geometry, it is required to take a certain number of samples from the water to examine the solids afterwards. Analyzing individual flood events, the number of samples and thus the expenditure of time for sampling and evaluation highly increases. An alternative is an indirect (optical) measuring method, such as turbidity measurement, to get a continuous time series. The aim of the study is to investigate the transport processes and drivers in the low mountain range Gersprenz catchment area (485 km²) including its small subbasin Fischbach (37 km²) combining direct and indirect measurement methods as well as identifying the sources and entry pathways of the suspend solids. Different empirical approaches were used to interpret the transport dynamics on various time-scales. In the analysis of temporal variability, the time-scale in particular individual events as well as seasonal differences should be considered. Our results show the evaluation of the influence of different field parameters like land use, slope, soil or hydro-meteorological factors on hysteresis loops and sediment rating curves. However, we accounted also the spatial variability of the measured values, both in the cross-section and along the watercourse, to regard the hydraulic parameters of the channel (discharge, depth, velocity, stream bed).

Uncontrolled Keywords: suspended sediment transport, hysteresis models, drivers and pathways, temporal and spatial variability
Divisions: 13 Department of Civil and Environmental Engineering Sciences
13 Department of Civil and Environmental Engineering Sciences > Institute of Hydraulic and Water Resources Engineering
13 Department of Civil and Environmental Engineering Sciences > Institute of Hydraulic and Water Resources Engineering > Engineering Hydrology and Water Management
Event Title: 17th Biennial Conference ERB2018 (Euromediterranean Network of Experimental and Representative Basins)
Event Location: Darmstadt
Event Dates: 11.-14.09.2018
Date Deposited: 25 Apr 2019 11:08
Official URL: http://erb-network.simdif.com/
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