水泵出水压力不足故障分析与排除

水泵在更换同一厂家的叶轮后,出现压力不足,根本无法运行的情况.通过对电机电流、水泵吸程部分、水泵叶轮、电机转速等一系列检查检测后,发现水泵叶轮质量增大导致电机转速降低是使水泵压力降低的主要原因.通过互换1#、2#水泵叶轮,解决了压力不足的问题.     

长距离大型引水工程全系统水力仿真计算及优化设计

研究了长距离大型引水工程全系统水力瞬变仿真计算,采用明渠非恒定流计算模型,模拟明渠沿程的进流和侧向溢流的问题;并用空间上的延伸来解决明流、管流联合计算时的时步衔接问题。应用特征隐式格式法,解决明满流分界面通过计算节点、压力出现剧烈变化时的计算不稳定问题。根据计算结果,对输水系统进行了优化设计。     

万家寨引黄工程北干线输水损失分析

万家寨引黄工程北干线系统输水损失，是关乎输水运行成本和水资源有效利用的重要问题之一。由于各类建筑物施工方法，材料及工艺的差异。其输水损失差异较大，计算方法和计算参数各不相同，文章在对各类建筑物进行输水损失计算的基础上，分析了不同类型建筑物的输水损失特点，提出了减少水量损失的建议和设想。     

从汾河水库泥沙淤积变化看上游水保治理成效

通过汾河水库建库运行40年中年降水、年来水量、水库泥沙淤积等实测资料比较分析，指出水库在1991～2000年的10年内降水减少情况下，年来水量增加，水库淤积显著减少，说明1987年以来进行的上游水土保持治理成效显著，效益巨大。     

万家寨水利枢纽利用岩的开挖卸荷及对策

万家寨水利枢纽位于深切U型峡谷区，基坑开挖过程中，坝基及厂房利用岩的卸荷回弹与其地质背景和裸露时间密切相关，施工时根据其特征，采取了相应对策，并取得良好效果。     

白莲河抽水蓄能电站事故照明运行方式探讨

对白莲河抽水蓄能电站当前事故照明运行方式存在的问题和隐患进行了分析,并对几种运行方式进行了分析和探讨,对抽水蓄能电站及常规电站事故照明设计及投运后事故照明系统运行、维护具有一定借鉴意义。     

知识经济条件下的山西水资源观

2l世纪是全球化知识经济的时代，本文在正确分析山西水资源现状的前提下，按照知识经济的含义，提出了知识经济条件下山西水资源的新观点。     

Evaluation of the origin of nitrate influencing the Klju? groundwater source, Serbia

This paper describes the use of the dual isotope method involving δ(15)N and δ(18)O measurements of dissolved nitrates to assess the origin and fate of groundwater nitrate at the Klju? groundwater source, Serbia. A sampling campaign was conducted in September 2007 during flow conditions obtaining groundwater from observation wells and river water fed by a shallow aquifer hosted in alluvial (sandy-gravel) sediments. Nitrate isotope ratios ranged from +5.3 to +16.9‰ and δ(18)O(NO(3)) values varied from -2.3 to +5.0‰. Two major contamination sources were identified with isotopic compositions characteristic for nitrate derived from nitrification of soil organic nitrogen (+5.3 to +7.8‰ for δ(15)N) resulting in nitrate concentrations of 33.6 and 78.8 mg/L and nitrate derived from animal wastes or human sewage, e.g. via septic systems, yielding δ(15)N values of +9.9 to +11.9‰ and elevated nitrate concentrations of 31.2-245.8 mg/L. The occurrence of nitrification and denitrification was also revealed based on concentration and isotope data for dissolved nitrate.     

Dynamic changes of the ecological environment quality in a river basin: a case study of the main stream of Songhua river basin

This paper reports the investigation and analysis of the status and dynamic changes of ecological environment quality in the main stream of Songhua river basin. The evaluation index system was established and the eco-environment quality in the year of 2000 and 2008 was studied in depth. Based on our research, the trend of dynamic changes of the eco-environment quality and its origins have been further discussed: In the year of 2000, the range of evaluation index covered from 0.31 to 0.47. Harbin and Yichun was relatively better than the rest of study areas. In the year of 2008, except districts of Daqing and Qitaihe, the environmental quality of Songhua river basin has entirely improved, wherein the evaluation index of the eco-environment covered from 0.31 to 0.57. Particularly, the eco-environment quality of Hegang and Shuangyashan has obtained significant improvement, whereas the improvement of Jiamusi was not obvious. According to the evaluation results, the environmental quality in the study area has an upward trend with the average growth rate 0.13% per year.     

山西省地表水供水工程现状调查评价

地表水供水工程是山西省水利工程的主力军。文中在调查地表水供水工程的设施现状和现状供水能力、工程效率、供水量的基础上，提出工程效率偏低和供水量偏低的结论，并进行了合理分析。