阶梯状抽水试验水文地质参数确定

针对传统阶梯状抽水试验参数计算过程中,通常只选择抽水阶段的部分试验数据等问题,应用Theis公式及叠加原理,利用抽水试验所有降深数据(抽水和水位恢复阶段全部资料)求解水文地质参数,利用承压含水层抽水试验数据计算得出导水系数、储水系数,利用潜水含水层抽水试验数据计算得出渗透系数和给水度,此外在低效率抽水井中利用抽水试验数据计算得出井损系数和井流量指数。计算过程中,利用Excel计算并绘制计算水位降深和观测水位降深的拟合曲线,计算过程简单快捷。整个抽水试验过程中,不必再分别提出抽水、水位恢复期的计算公式,可以避免人为选择单个水位降深数据对参数求解带来的影响。     

喀麦隆曼维莱水电站枢纽布置设计

介绍了曼维莱水电站枢纽布置设计及优化过程,在合同方案基础上,根据最新的补充勘测资料及多方案研究对比,对坝线选择、引水发电系统方案选择和厂区枢纽布置及优化设计工作做了详细的介绍,可供同类工程参考。     

Experimental study of a novel hybrid constructed wetland for water reuse and its application in Southern China

A new type of hybrid constructed wetland (CW), consisting of both vertical-baffled flow wetland (VBFW) and horizontal subsurface flow wetland (HSFW), has been deployed in Southern China to naturally accelerate the removal of organic matter and nitrogen. The hybrid CW system is characterised by a combination of continuous baffled flow vertical wetland and 'S' pattern horizontal subsurface flow wetland with natural aeration ditches to increase the concentration of dissolved oxygen in the HSFW bed. An internal circulatory system from the HSFW effluent back to the VBFW may optionally be operated to enhance the biological denitrification effect. Cyperus alternifolius is the main macrophyte in the wetland bed. The performance of the hybrid CW was studied with a pilot-scale system and three full-scale systems for municipal sewage treatment in Southern China. The results suggest that this new hybrid CW can achieve removal efficiencies of chemical oxygen demand, suspended solids, ammonia nitrogen, total nitrogen, and total phosphorus of better than 83.6, 95.0, 71.7, 64.5 and 68.1% respectively, with a specific wetland bed area of 0.70-0.93 m(2) PE(-1). The mean effluent concentrations of these parameters would meet the regulatory discharge limits for wastewater treatment systems (GB18918, 2002) and reuse in the context of agricultural irrigation solutions in China.     

Singular Spectrum Analysis and ARIMA Hybrid Model for Annual Runoff Forecasting

High accuracy forecasting of medium and long-term hydrological runoff is beneficial to reservoir operation and management. A hybrid model is proposed for medium and long-term hydrological forecasting in this paper. The hybrid model consists of two methods, Singular Spectrum Analysis (SSA) and Auto Regressive Integrated Moving Average (ARIMA). In this model, the time series of annual runoff are first decomposed into several sub-series corresponding to some tendentious and periodic motions by using SSA and then each sub-series is predicted, respectively, through an appropriate ARIMA model, and lastly a correction procedure is conducted for the sum of the prediction results to ensure the superposed residual to be a pure random series. The annual runoff data of two reservoirs in China are analyzed as case studies. The results have been compared with the predictions made by ARIMA and Singular Spectrum Analysis-Linear Recurrent Formulae (SSA-LRF). It is shown that hybrid model has the best performance.     

高陡坡运输碾压混凝土抗分离溜管的 研制与应用

为解决黄花寨水电站大坝工程高陡坡碾压混凝土运输问题,根据混凝土拌和物流变体特征,通过试验研制出能改变混凝土运行状态、控制混凝土输送速度,并能使混凝土在输送过程多次拌和的抗分离溜管。该抗分离溜管结构简单、操作简便,运行安全,制作及使用费低,在高陡坡条件下输送碾压混凝土,可以防止混凝土分离、保证混凝土质量,具有良好的推广价值。     

黄河海勃湾水利枢纽取水影响分析

黄河海勃湾水利枢纽是一座防凌、发电等综合利用的大型水利枢纽。重点从工程建成后对区域水资源、水域纳污能力、坝下河段最小生态水量、水温、水质、水生生物、西鄂尔多斯国家级自然保护区以及内蒙古河段防凌等方面的影响进行了详细的分析论述,总结了水利水电建设项目水资源论证中取水影响分析的经验以及需重点关注的问题,可为类似建设项目水资源论证取水影响分析提供参考。     

我国山洪灾害防治技术研究综述

针对我国防洪减灾工作中亟待解决的山洪灾害问题,总结了国内山洪灾害防治技术的研究成果,从山洪灾害的成因、预测预报技术、预警技术、监测预警系统建设、灾情风险评估技术、形成机理、防治区划及防治对策等7个方面对我国山洪灾害防治技术主要成果进行分析,探讨了当前存在的不足及今后研究的方向。     

以浸没式超滤膜为核心的短流程净水工艺的应用与思考

以浸没式超滤膜为核心的短流程净水工艺自问世以来受到业界的广泛关注.该工艺为净水厂建设和改造提出了一条将预处理、超滤、浓水回收、污泥浓缩、排泥等工序集合在一个构筑物中运行的全新技术路线,有着广阔的应用前景.从该工艺各个环节的特点出发,进行从设计到运行的多角度思考,提出了一些自己的理解,抛砖引玉与大家共同探讨.     

基于ANSYS的重力坝建基面等效应力计算

采用ANSYS进行重力坝坝体应力分析时,坝踵、坝趾等角缘部位存在应力集中现象,转化为等效应力可以有效地避免这个现象,但ANSYS没有提供专门的等效应力计算模块.本文基于ANSYS软件计算重力坝应力,采用VB可视化编程直接访问ANSYS数据库,结合等效应力计算公式实现对重力坝建基面等效应力计算,并通过算例验证了其实用性、...