Re-Look to Conventional Techniques for Trapping Efficiency Estimation of a Reservoir

All reservoirs are subjected to sediment inflow and deposition up to a certain extent leading to reduction in their capacity. Thus, the important practical problem related to the life of reservoir is the estimation of sedimentation quantity in the reservoirs. Large number of methods and models are available for estimation of reservoir sedimentation process. However, each model differs greatly in terms of their complexity, inputs and other requirements. In the simplest way, the fraction of sediment deposit in the reservoir can be determined through the knowledge of its trap efficiency. Trap efficiency （Te） is the proportion of the incoming sediment that is deposited or trapped in a reservoir. Most of the Te estimation methods define a relationship of the T, of the reservoir to their capacity and annual inflow, generally through curves. In this study, the empirical relationships given by Brune and Brown were used and compared for estimating the trap efficiency of Gobindsagar Reservoir （Bhakra Dam） on Satluj River in Bilaspur district of Himachal Pradesh, in the Himalayan region of India. A new set of regression equations has been developed for Brune＇s method and compared with Brown and other available Brune＇s equations. It has been found that Brune＇s equations developed in the present study estimated better than the other Brune＇s equations reported in literature. Later, in the present study it was found that Brown＇s approach was over estimating the T,. Hence it was again modified for Gobindsagar reservoir. It was also identified that sediments coming to this particular reservoir were mainly of coarse nature.     

办好《水文地质工程地质》期刊为水工环地质事业创新发展助力—— 在《水文地质工程地质》创刊50周年学术论坛上的讲话中国地质调查局副局长钟自然

尊敬的各位领导、各位专家、各位同事： 上午好! 受汪民同志委托,我代表中国地质调查局,向《水文地质工程地质》创刊50周年表示热烈的祝贺!向长期以来关心支持《水文地质工程地质》期刊的领导、专家表示衷心的感谢!向《水文地质工程地质》期刊的编辑、作者、读者的密切配合、辛勤劳动致以崇高的敬意!     

华北地区水工环重要成果集成

（1）“首都地区地下水资源和环境调查评价”项目,论证了怀柔、平谷、房山、西山和拒马河五处地下水应急供水方案,其中怀柔地区方案已经实施并正式供水,平谷、房山地区方案已被政府部门采纳并批准建设,为缓解目前北京市供水紧张局面做出了重要贡献。（2）“重点县（市）地质灾害调查与区划”项目在华北各省、市、自治区开展后,查找到了大量的地质灾害隐患点,圈定了地质灾害易发区,并协助当地政府建立了地质灾害预警系统和群测群防体系,其工作成果直接服务于防灾减灾,社会效益显著。     

一种水澉中组合活动堰的潮位潮流模拟系统

水工模型实验中，潮流模拟系统往往控制复杂，且调试困难。本文给出一种用单板机控制步进电机驱动高低组合活动堰板造潮的水动力控制系统，经实验验证，本系统控制简单，调试方便 ，造价低廉。