三峡水库运用对鄱阳湖调蓄能力的影响          下载免费PDF全文

范少英  邓金运  王小鹏  张冉 《水科学进展》2019,30(4):537-545

鄱阳湖调蓄能力受“五河”(赣江、抚河、信江、饶河、修水,以下简称五河)及长江干流的双重影响,三峡水库运用后,干流水文情势变化影响鄱阳湖与长江之间的水量交换。基于实测资料统计和湖口出流影响因素分析,建立了一种新的鄱阳湖出流及临界调蓄水位的计算公式,进而对三峡水库运用前后鄱阳湖各月调蓄水量的变化情况进行了定量分析。研究结果表明,长江干流和五河来流通过改变星湖落差和湖口水位来影响湖口出流及湖泊调蓄水量,但影响过程及影响量有所差异,若湖口水位不变,五河入流每增加1000m^3/s,湖口出流约增加304m^3/s,九江流量每增加1000m^3/s,湖口出流约减小723m^3/s。三峡水库运用会改变湖泊调蓄水量,年内各月相比,9月鄱阳湖水量减小约49.4%,5月鄱阳湖水量增加约47.7%。  相似文献   

Progress on Analytical Methods of Amino Sugars in Environmental Samples     

Jin’e Wei  Honghai Zhang  Yan Chen  Guipeng Yang 《地球科学进展》2019,34(1):84-92

As a kind of important biogenic organic matter, amino sugars can effectively provide insights for the source of organic matters and the contribution of bacterial organic matters based on their concentrations and compositions in the environment. A large number of studies on the analysis of amino sugars have been conducted for environmental samples throughout the world. However, comprehensive and systematic reviews of new progress on the analytical method are still rare. From the aspects of pretreatment methods and detection techniques, the advantages and disadvantages and applicable conditions of three common methods (eg. gas chromatography, high performance liquid chromatography and infrared spectroscopy) were systematically summarized. In terms of pretreatment, the process of the gas chromatography is cumbersome and requires derivatization, while the pretreatment of high performance liquid chromatography is relatively simple and easier to automate. In respect of instrument detection, the gas chromatography can detect four amino sugars (glucosamine, galactosamine, mannosamine and muramic acid) simultaneously and is more stable than the high performance liquid chromatography. In addition, the infrared spectroscopy method has the advantages of structural qualitative, however, its sensitivity is lower. There is no analytical method that can guarantee both sensitive analysis of amino sugars and experimental efficiency. Therefore, the analytical method should be reasonably selected according to the form of the sample and the requirements in the analysis of amino sugars. Further work should focus on economy, compatibility and online automation of analytical methods, so as to provide technical support for the research on biogeochemical processes of amino sugars in the environment.  相似文献   

金坛盐井套管锻铣关键技术研究与应用     

张传凤 《江苏地质》2019,43(4):696-700

将盐溶腔改造成储气库,改造老井时,锻铣施工返屑率低、携返时间长、环空憋堵严重、单副刀具进尺少,总体效率低,对锻铣效率影响较大的是钻压、转盘转速、铣进速度、泵排量、钻井液性能等,这些参数相互影响,需要系统协调配合。通过对关键参数的计算和研究,提出了提高锻铣效率的优化措施,经金坛茅井现场验证,能明显增加单副铣刀的施工长度,提高总体施工效率。  相似文献   

Measurement and analysis of depression storage on a hillslope     

J. Sneddon  T. G. Chapman 《水文研究》1989,3(1):1-13

A precise photogrammetric technique was used to determine the microtopography of seven 2.6 m × 1.2 m experimental units located on a hillslope. Surface elevations were determined with an accuracy of better than 1 mm, from which contours at 2mm intervals were interpolated. These contour plots were then manually interpreted to define depressions and associated storage volumes. Analysis of the results highlighted the complex variability of depression storage over the hillslope, for example there being little relation between depression storage volumes and unit slope. This study also highlights the sampling problem for the measurement of depression storage on natural surfaces, which appears not to have been formally recognized previously, and also emphasizes the practical difficulty of achieving depression storage estimates with coefficients of variation less than ten per cent to 50 per cent, much of this variability being due to problems of interpretation rather than measurement of the surface.  相似文献   

黄河中游地区岩溶水资源人工调蓄的可行性研究   总被引：2，自引：2，他引：0  

迟宝明  戴长雷 《水文地质工程地质》2003,30(4):31-34

黄河中游地区岩溶发育,岩溶含水层拥有巨大的地下水调蓄空间,地面入渗条件极佳,洪水资源丰富,在有利的部位兴建人工促渗工程,加大岩溶水资源的人工调蓄力度,可极大地增加该地区水资源的开发利用能力,提高区域水资源承载力,缓解黄河中游地区水资源紧张的压力。  相似文献   

Preliminary design of an underground reservoir for pumped storage     

Nasim Uddin Ph.D.  P.E.  M. Asce 《Geotechnical and Geological Engineering》2003,21(4):331-355

The current interest in the potential utilization of subsurface space for the storage of a wide variety of materials is responsive to the increasing pressures of environmental concerns, particularly as it applies to the development of urban or suburban space. These pressures, in conjunction with the continuing development of underground excavation technology, combine to provide a situation within which the concept of subsurface space utilization is becoming increasingly attractive relative to more conventional surface developments. Underground pumped storage is currently an economically viable alternative to the conventional above ground type of facility, and is made increasingly attractive by consideration of the reduced environmental impact, which the underground concept make possible. This paper is intended to provide an introduction to the engineering challenges of underground pumped storage, with particular reference to a limestone mine located some 671m below the ground surface and having a volume of 9.6 million m³. To this end, the paper presents the numerical modeling and analyses to establish a powerhouse setting that would provide both a structurally stable excavation under the loading conditions imposed by the high-pressure brine, and eliminate the possibility of significant brine inflow to the excavated caverns.  相似文献   

电磁波层析成像数据采集系统   总被引：1，自引：0，他引：1  

张景涛  周鹤鸣 《中国地震》1996,12(1):35-42

阐述了电磁波透射层析成像数据采集系统的研制，对软硬件的设计作了较详细的说明，还介绍了相应的技术细节。该系统是一个软件、硬件结合的单片机控制数据采集系统：硬件全部采用低功耗、高速器件、其中Ａ／Ｄ转换器采１２位双各分型模数据转器。  相似文献   

Impact of liquid waste disposal on potable groundwater resources near Perth,Western Australia     

S. J. Appleyard 《Environmental Geology》1996,28(2):106-110

 Drilling of 15 boreholes at a disused liquid waste disposal site near Perth, Western Australia, has indicated that a contamination plume extends about 1000 m in a southerly direction from the site in the direction of groundwater flow. The plume is up to 600 m wide and 5–40 m thick. Chemical and microbiological analyses have indicated that contaminated groundwater contains high concentrations of ammonia, iron, and bacteria at levels that commonly exceed national drinking water guidelines. It is likely that a proposed water supply production well in the path of the contamination plume will have to be abandoned, and additional wells may have to be abandoned if the plume continues to extend in the direction of groundwater flow. There is currently insufficient information to indicate whether the plume is continuing to expand, but studies on similar plumes in the Perth metropolitan area have indicated that contaminated groundwater can move at rates up to 100 m yr^–1. Several other liquid waste disposal sites are now located in residential areas of Perth where wells are used for garden irrigation. Further work is required to ensure that there is no potential impact of groundwater contamination on public health in these areas. Received: 31 July 1995 · Accepted: 18 September 1995  相似文献   

论地洼构造对砂岩铜矿床的控制作用   总被引：2，自引：1，他引：2  

徐一仁  张素华 《大地构造与成矿学》1996,20(2):158-164

本文以四川会理地洼盆地为例，论述了地洼构造对砂岩铜矿床成矿的控制作用。即地洼盆地沉积前基盘构造控制了盆地的形态及矿源层的展布方向和物质来源；沉积期构造任制了矿源层的岩相和厚度；沉积后的构造决定了储矿砂体的空间位置、铜质来源和矿体的形成；成矿后的构造对砂岩铜矿床成矿的控制有二重性：一方面可以形成新的矿体；另一方面可破坏原来已形成的矿体。  相似文献   

两种地应力测量方法在某抽水蓄能电站中的应用     

钟作武  廖建强  陈玲  周密 《岩土力学》2003,(Z1)

简述了深孔套芯解除法三维地应力测量和水压致裂法测量地应力的试验方法及其在某抽水蓄能电站中的测试结果,并结合地下厂房和高压岔管区时地应力测试结果进行了分析。  相似文献