3-D NONLINEAR SUPERCAVITATING FLOW IN A GRAVITY FIELD

In this paper,perturbation method and Fourier-cosine-expansion method are used to solve a 3-D nonlinear problem of a supercavitating flow in an inclined field of gravity at large Froude numbers.By expanding the velocity potential into a power series of a small parameter,the original 3-D nonlinear problem is reduced to a number of 2-D ones. The solutions of the first three orders are derived in detail and expressed in terms of the complete elliptic integrals of the first and second kinds.Then the boundary integral equation method is applied to get the numerical solutions for each order.Computational results are provided for supercavitating flows past cones under various flow conditions.     

3-D SHALLOW WATER FLOW COMPUTATION BY A SEMIIMPLICIT FINITE ELEMENT METHOD

A simi-implicit finite element method is developed for three-dimensional shallow water flow. By using water depth to scale the vertical coordinate, the governing equation is transformed into fixed computational domain. An efficient generalized conjugate gradient scheme is adopted for the solution of finite element analogy.     

开敞型海湾大型油码头平面布置优化研究

在开敞型海湾合理布置大型水工建筑物是一个值得探索的课题。本文通过潮汐海湾物理模型试验，结合对实测资料的分析，对我国东南沿海某开敞型海湾扩建大型油码头三个平面布置方案进行了论证，确认了试验区内较为可行的工程布置。最后，提出了在开敞型海湾内合理布置大型水工建筑物的几点看法。     

自浮式气压沉柜在水下工程检修中的应用

万福闸管理所设计、研制的自浮式气压沉柜，适用于水深为2．8～7．5m的水下工程检修。它较其它常规水下检修方法具有投资少、移动灵活、排水方便、适应性强等优点。并已在葛洲坝、万福闸等8个大中型水下工程检修中成功应用，取得显著的社会和经济效益。     

考虑缺水滞后效应的作物-水模型研究

本文依据作物生理学有限缺水理论，考虑作物不同生育阶段缺水对叶面积系数、腾发量变化及产量影响的滞后效应，假设这种滞后影响过程的现在阶段只与将来阶段有关，而将来阶段与过去阶段无关，经单阶段和多阶段缺水的两种田间灌溉试验，求得改进的加法模型即考虑缺水滞后效应的作物水模型（ＬＥＭＣＲＷ），与常见的３种国外ＭＣＲＷ比较具有较广泛的适应性和较好精度，只要正确选用不同的敏感指标，可供单阶段和多阶段缺水对产量影响的非充分灌溉模拟．     

水资源价值

本文从自然资源的一般定义和属性出发，对国内外各主要观点进行了概述；进而针对水资源的具体特点，从地租论、劳动价值论、边际效用论、非使用价值论等不同角度，对水资源价值的内涵进行了界定.从经济学角度，这一界定为水资源费的定价提供了理论依据；从管理学角度，为水资源的资源权属管理与相关资产权管理相分离的先进管理模式奠定了基础。     

坝体变形一维多测点分布混合模型中温度分量的确定

 现有坝体变形一维多测点分布混合模型在分解相应的温度和时效分量上存在不足， 然而运用理论计算与统计分析相结合的方法可以确定温度分量， 从而分解出时效分量。实例计算结果表明上述方法是行之有效的。     

太平溪小流域水土保持蓄水减沙效益初步研究

太平溪小流域地处三峡库乎宜昌县西部，距三峡坝５ｋｍ的长江西陵峡北岸，治理前水土流失严重，大量坡面商沙以沟道推移直接进入三峡库区。     

水资源管理模式探讨

本文以未资源工作由计划经济的管理体制,向适应社会主义市场经济要求的管理体制转变,及利用方式由粗放型变约型转变,这两个根本性转变、水资源管理新的含义和任务等理论进行探讨,以澄清思路,统一认识,为进一步做好水资源管理工作打下理论基础。     

Evolution of the Water Table in a Finite Aquifer Due to Transient Recharge from Two Parallel Strip Basins

Understanding the dynamic response of phreatic aquifers due to recharge is most important for the proper management of ground-water systems. In this paper an analytical solution is developed to describe the water-table fluctuation in a finite aquifer system due to transient recharge from two parallel strip basins. Application of the solution in the prediction of spatiotemporal variation of the water table and in the sensitivity analysis of the effects of various controlling parameters on the water-table fluctuation is demonstrated with the help of an example problem.