Up at 6 : 00 on the 31st , installed in the mine incidents around the drainage capacity centrifugal pumpsto pump 6 , 190 cubic meters / hour , huayuan mine water than the previous highest level fell 44 . 55 meters 截至31日6时，安装在事故矿井周围的水泵排水能力达到6190立方米/小时，华源煤矿井下水位比此前最高水位下降44 . 55米。
The state environmental protection administration ( sepa ) has been closely monitoring taihu ' s water quality , using 110 manned and three automatic surveillance stations scattered throughout the entire lake area 国家环境保护局密切关注着大湖水质的变化，使用了散布在整个湖域的110个人力或自动化的监测站。 （于是，在200年，这些监测站得出一个一个结论，天气变化，太湖水位下降，风向有异，纯属自然灾难。 ）
Article 26 : in mining operations or the construction of underground projects , when water drainage results in lowering of the groundwater table , groundwater depletion , ground subsidence or cave - ins , and causes losses to the livelihood and production of other units or individuals , the mining unit or the construction unit shall take remedial measures and compensate for the losses 第二十六条开采矿藏或者兴建地下工程，因疏干排水导致地下水水位下降、枯竭或者地面塌陷，对其他单位或者个人的生活和生产造成损失的，采矿单位或者建设单位应当采取补救措施，赔偿损失。
The cause of vacuum degree formation under groundwater table is discussed in the paper . the testing results show that vacuum degree above the groundwater table is produced directly by pumping air , and that vacuum degree below groundwater table is produced mainly by dewatering and by escaping of sealed air from the end of flexible pipe . based on the bernoulli equation , the limit lowering of groundwater table is analyzed , which is about 5 ~ 7m . the effective influence depth of vacuum preloading has relationship with pvds depth and can be more than 10m 对地下水位线以下的真空度成因进行了分析，结果表明，地下水位线以下测到的真空度是由于测试软管中水位下降或部分封存气体从软管末端逃逸引起的，与地下水位线以上的真空度由抽气直接形成在成因上存在不同；根据伯努俐方程，对地下水位下降的极限深度进行了分析，得出真空预压中地下水位的极限下降深度为5 7m ；对有效影响深度的分析结果表明，真空预压的有效影响深度与塑料排水板的打设深度具备一定关系，有效影响深度可以超过10m 。
According to the data analysis , the large scale and continuous excavating sand from the riverbed , which has caused the riverbed downcutting , water level decline and relative strengthening of tidal action , is the basic and main cause that raises the saline water intrusion in the peal river network area , but the arid climate and the sea level rise only aggravate the disaster 咸潮灾害发生前和发生时期进行的大规模采掘河沙活动使三角洲河床普遍大幅度下切，河流水位下降，潮汐作用相对增强，这是引发咸潮的主要原因；而天旱和海平面上升等则使咸潮灾害加重。
China possesses of 22 percent of world population , but it only enjoys 6 percent of world water resource . there are above 400 cities shorting water in 668 cities of china . in order to satisfy increasing demand to water supply , some city blindly overexploits groundwater , which results in regional water level descending and induces ground sedimentation and crack geologic disaster 中国拥有世界22的人口却只享有世界6的水资源，全国668个城市中，有400多个缺水，为了满足日益增长的供水需求，一些城市盲目超采地下水，导致水位下降、地面下沉、海水倒灌，进而污染了地下水。
Due to the influence of climate drought and human activities , the ecological environment of qinghai province is in an increasingly grave condition , namely , climate abnormal events occurring frequently , grassland degenerating , ground sanding , glacier shrinking , water level of lakes descending and river runoff decreasing , and so on . in the basis of extensively collecting and analyzing the data of qinghai ecological environmental factors such as climate , water resource and grassland resource etc . , the further basic research is performed on the ecological environment characters of main climate factors , surface runoff , water resource , lcc and their correlation to coordinate with the basic , strategic and precursory research for the development of china west part and provide the scientific foundation for corresponding development both ecological environment and social economy , and persistent utilization of natural environment resource 本研究针对当前在气候干旱化和人类活动的共同影响下青海省生态环境中气候异常事件即气象灾害频繁发生、草场退化、土地沙化、冰川萎缩、湖泊水位下降和河流流量减少等生态环境退化现象日益严重的实际，在广泛收集和整理青海省气候、水资源、草地资源等生态环境因子基础资料的基础上，对青海的主要气候要素、地表径流、水资源、植被的演替及其相互间的关系等主要生态环境变化特征进行了基础性的研究。
Then river width increased and the intensity of deep point lowing and bed material coarsening decreased and water level lowed continuously . so the bed form changed toward to u type . the bed regulation is realized through sediment silting in different parts in cross section during silting period and the deformation of bed form changed from broad u type channel to narrow and deep v type channel 研究表明，河道在持续冲刷前期深泓点及水位下降与河床粗化同步发展，河床向v型发展；冲刷后期深泓点下降、河床粗化减弱，河道展宽增大，水位继续下降，河床向u型发展；在以淤积为主时期的调整，是通过断面不同部位的淤积来实现的，但都是由u型较大河槽向v型窄深小槽发展。
