The hydrodynamic behavior of large turbid current in stratified reservoir is depicted through numerical calculation results, and the succeeding long-term turbidity is quantitatively analyzed. The large volume current with dense sediment flows towards the downstream along the bottom of reservoir, and the backwater after clashing dam contributes much to the mixing of turbid water with surroundings, causing prolonged turbidity in the reservoir. This mechanism implied possible treatments to reduce the volume of the turbid water. Numerical experiments indicate that successfully purging the turbid water by a low layer outlet, such as a selective withdrawal device, reduces the residual turbid water in reservoir by 88%. Further calculations demonstrate that changing the stratification condition or the outlet elevation in reservoir is conducive to controlling the behavior of sediment flow, hence alleviating the turbidity problem after flood.
CHEN Fei-yong
,
HOTTA T
,
LIU Bing
. Behaviors of Large Turbid Current and Countermeasures for Long-term Turbidity Problem in Stratified Reservoir[J]. Journal of Changjiang River Scientific Research Institute, 2020
, 37(3)
: 1
-5
.
DOI: 10.11988/ckyyb.20190959
[1] AKI S, SHIRASUNA K. A Numerical Study on the Flow regime in Dam Reservoir. Journal of Hydropower and Hydraulics, 1975, 134.
[2] FUKUOKA S, FUKUSHIMA Y, MURATA K, et al. Experimental Study on Density Currents Advancing into a Two-dimensional Stratified Reservoir. Journal of JSCE, 1980, 293/II-1.
[3] YOUNG D L, LIN Q H. Density Currents during a Storm in Te-Chi Reservoir of Taiwan//Proceedings of the 24th IAHR Conference of International Association for Hydraulic Research, Delft, The Netherlands.
[4] RAYNER K N. Diurnal Energetics of a Reservoir Surface Layer, Joint Report: Environmental Dynamics. Perth: Department of Civil Engineering, University of Western Australia, 1980.
[5] CHEN F Y, YOSHIDA N, SEKINE H, et al. A Prediction Method and Conservation Measures of Water Quality in Dam Reservoirs//Proceedings of the Second International Summer Symposium of JSCE, Tokyo, Japan. July 28, 2000.
