scholarly journals A modelling approach to quantify the influence of fine sediment deposition on biogeochemical processes occurring in the hyporheic zone

2012 ◽  
Vol 48 (3) ◽  
pp. 279-287 ◽  
Author(s):  
S. Navel ◽  
S. Sauvage ◽  
S. Delmotte ◽  
M. Gerino ◽  
P. Marmonier ◽  
...  
Keyword(s):  
Hyporheic Zone ◽  
Fine Sediment ◽  
Sediment Deposition ◽  
Biogeochemical Processes ◽  
Modelling Approach

Transient hyporheic exchange during rainfall events in a gaining stream: Field investigation, conceptual model, and numerical interpretation

2020 ◽  
Author(s):  
Chengpeng Lu ◽  
Keyan Ji ◽  
Yong Zhang ◽  
Jan Fleckenstein ◽  
Chunmiao Zheng ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Conceptual Model ◽  
Hyporheic Zone ◽  
Flow Model ◽  
Surface Flow ◽  
Hyporheic Exchange ◽  
Biogeochemical Processes ◽  
Cross Sectional ◽  
Rainfall Events ◽  
Hyporheic Flow

<p>Hyporheic exchange is transient in nature, considering the temporal fluctuations in hydrological and/or biogeochemical conditions in surface water and groundwater (SW/GW).  Efforts are needed to further identify the patterns and driving mechanisms of transient hyporheic exchange.  This study combined a reach-scale field survey and numerical modeling analysis to reveal the pattern of transient hyporheic exchange during rainfall events in the Zhongtian River, southeast of China. Field observations revealed hydrodynamic properties and temperature variations in SW/GW, suggesting that the regional groundwater recharged the study reach.  A one-dimensional heat transport solution was built and used to generate the planar and cross-sectional hyporheic flow fields. A two-step numerical modeling procedure, including a hydraulic surface flow model and a groundwater flow model, was then used to simulate the observed flow system. The hyporheic exchange exhibited strong temporal evolution, as indicated by the rainfall event-driven hyporheic exchange, the depth-dependent hysteretic response to rainfall, and the area of local downwelling flow increasing with rainfall. Dynamics of the hyporheic exchange in the study reach, therefore, significantly changed in space and time due to rainfall. The reversal of hydraulic gradient and transient hyporheic exchange were observed and validated using the numerical simulation. Anisotropic hydraulic conductivity is the key to generate transient hyporheic exchange. A revised conceptual model was used to interpret the observed temporal patterns in hyporheic exchange  The pattern of transient hyporheic exchange indicates that transient hyporheic exchange only appears after an increased phase of river stage but does not last for a long time. The temporal pattern of hyporheic exchange can significantly affect the evolution of biogeochemical processes in the hyporheic zone for a gaining stream by, for example, temporally facilitating special biogeochemical processes.</p>

Is fine sediment deposition a main driver for the composition of benthic macroinvertebrate assemblages?

2013 ◽  
Vol 24 ◽  
pp. 589-598 ◽  
Author(s):  
Marta Gerta Von Bertrab ◽  
Andreas Krein ◽  
Sonja Stendera ◽  
Frankie Thielen ◽  
Daniel Hering
Keyword(s):  
Fine Sediment ◽  
Sediment Deposition ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Assemblages ◽  
Main Driver

Analysis of Application of Sediment Trap in Rivers as An Effort Reservoir Sedimentation Control

2021 ◽  
Vol 26 (2) ◽  
pp. 229-236
Author(s):  
Dyah Ari Wulandari ◽  
Desyta Ulfiana ◽  
Priyo Nugroho Parmantoro
Keyword(s):  
Sediment Trap ◽  
Sediment Load ◽  
Sediment Traps ◽  
Fine Sediment ◽  
Sediment Deposition ◽  
Reservoir Sedimentation ◽  
Check Dam ◽  
Fine Sediments ◽  
Irrigation Channels ◽  
Selection Of

Reservoir sedimentation can be overcome by reducing the amount of sediment that enters the reservoir, by building check dam. The check dam has more deposited coarse sediment load than fine sediment load. Fine sediment that escapes the check dam will flow further and eventually enter the reservoir pond. Therefore it is necessary to build a building that can capture fine sediments. Construction is planned as a system of sediment trap in irrigation channels. The purpose of this study is to analyze the possibility of applying the sediment trap in the river to deposit sediments that escape the check dam. The analysis begins with the selection of the location of the sediment trap, then calculate the dimensions of the sediment trap and the amount of sediment that has settled. Based on the analysis of the selected dimensions with several combinations of gradation of sediment grains, sediment deposition that occurs ranges from 42 - 68%. So it can be concluded making the sediment trap in the river can be done. However, for the application of these sediment traps further research is needed regarding the dimensions of sediment traps that are most optimal for sediment deposition.

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