The foundation pit of Yamansu hydropower station has an average depth 70 m and been excavated with five-level slopes. Lowering groundwater level is important in excavation. In this study, drainage pumping were conducted dewatering. Pumping tests performed to reverse hydraulic parameters calibrate numerical models. Numerical simulations evaluate the dewatering scheme. first stage, powerhouse tai...

An analytical solution for the case of transient, pumping-induced drawdown in a nonuniform aquifer is presented. The nonuniform aquifer is conceptualized as a uniform matrix into which a disk of anomalous properties has been placed. The disk can be arbitrarily located with respect tothe pumping well. This solution can be used to develop considerable insight concerning the nature of drawdown i n...

Risk management of drawdowns and portfolio optimization with drawdown constraints is becoming increasingly important among practitioners. In this paper, we introduce new techniques how to control the maximum drawdown (MDD). One can view the maximum drawdown as a contingent claim, and price and hedge it accordingly as a derivative contract. Trading drawdown contracts or replicating them by hedgi...

Based on the joint scheduling model of cascade reservoirs and a dynamic programming (DP) algorithm, this paper studies optimal control yearly drawdown level an overyear regulation reservoir considering influence inflow uncertainty. An innovative method has been put forward, corresponding technical route is provided. In case study, seven Yalong River are used as research object, proposed verifie...

Recent years have seen an increase in the use of computer-based numerical models to test stability earth dams and simulate impact all factors that affect their safety. Geo-Studio software its sub-programs SLOPE/W, QUAKE/W are used determine safety dams, investigations dynamic analysis, a finite element serves as base do modeling for this study. The Hemrin Dam represents case study is regarded s...

The calculation of the discharge to a constant drawdown well or tunnel in the presence of an infinite linear constant head boundary in an ideal confined aquifer usually relies on the numerical inversion of a Laplace transform solution. Such a solution is used to interpret constant head tests in wells or to roughly estimate ground water inflow into tunnels. In this paper, a simple approximate so...

In this study, non-Darcian flow to a largerdiameter partially penetrating well in a confined aquifer was investigated. The flow in the horizontal direction was assumed to be non-Darcian and described by the Izbash equation, and the flow in the vertical direction was assumed to be Darcian. A linearization procedure was used to approximate the nonlinear governing equation. The Laplace transform a...