Study On Hydrochemistry-isotope Characteristics Of Karst Water In Heilongguan Spring Field

With developing of society and economy, the demand of water resource haveincreased obviously, the problem of water lacking and pollution seem so particularlyserious, that restrict economic development directly. According to previous records, morethan300karst water springs used to be distributed in Beijing. As the change of conditions,such as variation of climate, mining activities, utilization of karst water. In the most spring,the water volum reduced seriously, especially, the large spring appeared zero flow someyears ago. Beijing is a water-shortage city. The water shortage is a restrictive factor ofsustainable development of society and economy all the time. Judging from the presentsituation, we should grasp the hydrology condition and hydraulic connection of allhydrological units. On this basis, we can keep the balance under the human suitableexploitation and avoid the water pollution.Hei Longguan located Fang Shan area in Beijing is the important energy base. From1970, some kinds of industries have developed rapidly, for example, resource industry,mineral industry and so on. But the development leads to some damage in a certain degreeto local water resources and local ecology environment. From2003, three projects ofemergency water source have been started. They are Beijing-Xi Shan Fang Shan-ZhangFang and Ping Gu-Zhong Qiao. Xin Baodong（2005） divided the distribution area of karstwater in Fang Shan-Zhou Koudian into three unites. The Zhang Fang emergency watersource,Gao Zhuang-Gan Chi Spring area are located in hydrology geology unite of XiaYunling–Long Mentai synclinorium. We have not had further study about the springboundary of Hei Longguan spring area and the hydranlic connection between HeiLongguan spring area and the other spring area.The article have addressed the problem of environmental geology boundary of thesystem about karst water. We divided the resistivity water boundary by means of fieldinvestigations, field sampling and indoor test. We have grasped the source apportionmentof water chemical composition by analyzing the correlation of them. We have determinedhydrochemistry type、resistitity boundary,weakly permeable boundary and permeableboundary by the method of cluster analysis, piper, and milligram equivalent.The study result show that the features of aquifer （aquifuge）, groundwater regime andwater quality types. The article is focusing on the characteristic of groundwater runoff, water abundance, regulations of moving and fracture development. The Da Shi He Zisubsystem is supplied by precipitation and surface water leakage, and excreted by naturalspring in Jiu Dao river and Liang Shui spring. Simultaneously, the karst water subsystem ofsouth limb syncline of Bai Hua mountain is supplied by precipitation, surface waterleakage, drainage of coal mineral in Da An mountain and secondary leakage in the area ofJiu Dao river. The final discharge point of subsystem is Hei Longguan spring.We can draw the conclusion that the type of water of study area is HCO₃-Ca and theover all water quality till keeps good, but some points. The points may be polluted by theactivities of coal mining and human survival.The article have several innovative points that studied the relatively independenthydrology geology unit, divided the boundary of Hei Longguan spring area and displayedthe relationship of supplement and discharge. The study of hydra chemical isotope havebeen started and supported the research of hydrology evolution.