汾河异重流运动规律研究及其对引黄南干联接段取水建筑物的影响

引黄南干联接段取水建筑物位于汾河水库右岸 ,水库异重流对取水水质具有十分不利的影响。本文主要是运用河流泥沙动力学及河床演变的有关原理对汾河水库异重流运动规律进行了计算和分析。

Study on Motion Law of Density Current of Fenhe Reservoir And Its Influence on Intake Water Quality of the South Main Line of the YRDP

The diversion structure of the Connection Works,on the South Main Line of the YRDP(Yellow River Diversion Project)lies in the right bank of Fenhe Reservoir,the influence of density current in Fenhe Reservoir on the intake water quality of the YRDP is an important problem to which attention should be paid.In this paper,the formation and sustained motion of density current in Fenhe Reservoir,formation of turbid water reservoir,and the method and procedure for computing the density current are studied,the results of computation of the density current in Fenhe Reservoir are given as well.The conclusion is that the elevation of turbid water surface would be raised to 1111.15m in the year of 2010,including the thickness of density current,1.83m,which is 1.15m higher than the floor elevation of the intake of the diversion,causing a severe problem exerting an influence on the quality of the water which is to be taken by the intake of the YRDP.The above conclusion is estimated by the following data:the deposition thickness is 0.32m a year in average from 1979 to 1994,while the river bed elevation of scouring funnel,in which the diversion structure is located,is 1104.2m in 1994.However,the estimation in this paper is relatively rough because of changeability and complexity of motion of density current.Therefore,the writer holds that the physical model test or mathematical model computation should be done to determine the rational operation way of Fenhe Reservoir under varying discharge and varying sand content in different period for ensuring the intake water quality of the YRDP.