In the early stage of water storage of xiaolangdi reservoir , it can basically retain all of sediment out of sanmenxia reservoir , its mode of discharging sediment is mainly depended by discharging sediment with density flow 在小浪底水库初期蓄水运用阶段，三门峡水库出库的泥沙部分被拦截在库内，部分以异重流形式排出库外。
The discharging sediment with density current is an only measure to reduce reservoir region " s deposition in the reservoir with storage operation on the overloaded river and an important mode to discharge sediment for deposition reduction as well 异重流排沙是多沙河流上的水库蓄水运用时唯一能够减少库区淤积的措施，也是水库排沙减淤的一种重要方式。
The thesis " main studies and achievements are as follows : 1 . under the assumption of double - layer computational mode , the governing equations for the horizontal 2 - d stratified density current is derived by integrating the 3 - d fundamental equations along the flow depth . 2 在异重流双层计算模式下，从三维水沙基本方程出发，利用数学工具沿垂线积分，推导得出了平面二维异重流上、下两层水体的水沙运动基本方程。
So as the enter point of the stream , the income of the reservoir , the time of the flood peak lasted , the quantity of sandiness income and the strobe of the darn . we must do some work to forecast and watch the different density stream . by experiments , we made out that it is impo rtant for us to reduce the water lever in work of the river belongs lots of sandiness 从异重流试验看，在正常运用下，水库产生泥沙异重流的机率较大，能否运动到坝前排出库外，还要看异重流潜入点位置、入库流量、洪峰历时、入库含沙量、水库闸门运用等因素，需要做好异重流预报监测工作。
Based on the relative data of density flow in xiaolangdi reservoir in flood period of 2001 , and through analyzing on water - sediment condition of density flow formed and movement element of density current , the common movement law and special phenomenon on forming , operating and discharging sediment of density flow in xiaolangdi reservoir have been clarified in this paper . the relationship of sediment transport of density flow has been explored combining with theory analysis and formula deduction 本文主要依据2001年洪水期小浪底水库异重流的有关资料，通过对形成异重流的水沙条件、异重流运动要素的分析，阐明了小浪底异重流的形成、运行和排沙等方面的一般运动规律和特殊现象，结合理论分析和公式推导，探讨了异重流输沙关系。
To study common law of producing , transporting and discharging sediment of density flow in xiaolangdi reservoir is convenient to using density current better for serving the production and providing scientific basis for regulating water - sediment in xiaolangdi reservoir . simultaneously it has an important reference value for storage operation of reservoir on the overloaded river and provides valuable data for theory development of density current 研究小浪底水库异重流的产生、输移和排沙等方面的一般规律，便于更好的利用异重流为生产服务，为小浪底水库调水调沙运用提供科学依据，同时对多沙河流水库的蓄水运用具有重要的参考价值，为异重流理论发展提供宝贵的资料。
After a comprehensive review on the study of sediment density current in the recent several decades , a set of differential equations for 2 - d density current under double - layer computational mode is established . by simplifying th . set of equations , a 2 - d numerical simulation of sediment density current and sediment outflow has been made in the liujiaxia reservoir in the yellow river basin , and the result is reasonable 本论文在对异重流运动近几十年来的研究成果进行较系统、全面论述的基础上，针对目前研究较为前沿的异重流运动数值模拟问题，提出了一套二维异重流双层计算模式下的基本方程，并在这套方程简化的基础上，对黄河流域刘家峡水库中的异重流运动和排沙进行了二维数值模拟，结果令人较为满意。
On the one hand , the sediment density current often does a great harm to the reservoir , and causes a big loss of reservoir ' s storage capacity or makes reservoir severe deposition ; on the other hand , sediment outflow by density current is an effective measure to mitigate sedimentation 异重流(本论文中主要指因含沙量的差异而形成的浑水异重流)一方面常常给水库带来严重的危害，加速水库的淤积和库容的损失；但另一方面它又为水库排沙提供了一种极为有效的途径? ?水库异重流排沙。
