Study of Hyporheic flow pattern downstream of river steps

Document Type : Research Article

Authors

1 PhD Student, Department of Water and Soil, Gorgan University of Agricultural Sciences and Natural Resources

2 Associated Professor, Department of Water Engineering, Gorgan University of Agricultural Sciences and Natural Resources

3 Associate Professor, Department of Water and Soil, Gorgan University of Agricultural Sciences and Natural Resources

Abstract

The Hyperic region is an area immediately below the riverbed in which the mixing of downwelling surface water with subsurface flow occurs. This area plays a very vital role in the ecology of the river and causes self-purification of the river flow. Rockboulders in riverbeds usually act as impermable barriers, creating a hydraulic head difference upstream and downstream of these structures, and a hydraulic jump occurs downstream. Since scour hole is usually formed downstream of these barriers, so the purpose of this study was to determine the different pattern of hyperic exchanges around rigid river barriers in three different flow conditions(i.e., clinging nappe, rapid variable flow and hydraulic jump-scouring. To evaluate the results, a laboratory flume was used to determine the flowpaths of hyperic streamlines. The numerical model was also used for simulation of hyporheicflow. The results showed that there was a good agreement between the observed and computational flowpattern in the hyperic area for both clinging nappe and hydraulic jump, and Upstream Directed Upwelling(UDU) was observed in the area between the vertical barrier wall and the point of maximum scour depth and downstream Directed Upwelling(DDU) was observed in the numerical model. Also, the results showed that there are a power relations between total exchange rate(Qex), the residence time(Rt) and the percentage of exchange rate(Qp) against Reynolds number and correlation coefficient of 95, 81 and 86% was obtained for Qex, Rt and Qp, respectively. The accuracy of estimation shows that these relations can be used for estimation of hyporheic characteristics.

Keywords


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Volume 8, Issue 4
April 2022
Pages 1127-1145
  • Receive Date: 10 September 2021
  • Revise Date: 20 November 2021
  • Accept Date: 31 January 2022
  • First Publish Date: 20 February 2022