基于PLEIK模型的岩溶地下水防污性能评价——以贵阳市汪家大井泉域为例

Evaluation of Anti-fouling Performance of Karst Groundwater Based on PLEIK Model:Taking Wangjiadajing Spring Area in Guiyang as an Example

岩溶地下水资源是中国西南地区经济发展的重要基础。对岩溶地下水进行防污性能评价是合理开发及保护当地地下水资源的有效方法。汪家大井现为贵阳市东郊水厂取水地,是区域内重要的供水水源,对其进行地下水防污性能评价有助于保障居民饮用水水源安全。通过构建研究区PLEIK模型,在考虑保护性盖层(P)、土地利用类型(L)、表层岩溶带发育程度(E)、补给类型(I)及岩溶网络发育程度(K)5个评价因子的基础上,对汪家大井泉域岩溶地下水防污性能进行定量评价。结果表明,研究区内地下水防污性能以较好和中等的区域为主,分别占总面积的23.69%和42.11%;防污性能较差和好的区域次之,分别占总面积的18.54%和15.53%;防污性能差的区域最少,约占总面积的0.13%;表层岩溶带、含水层岩溶网络及土地利用类型是影响该区域岩溶地下水防污性能的主要因素。其研究结果可为该地区地下水环境保护及污染防治提供一定的参考。

Karst groundwater resources are the important basis for economic development in Southwest China.The evaluation of anti-fouling performance of karst groundwater is an effective method for rational development and protection of local groundwater resources.The Wangjia well is now the water intake of the water plant in the eastern suburbs of Guiyang City.It is an important water supply source in the region.The evaluation of groundwater anti-fouling performance in the region is helpful to ensure the safety of drinking water sources for residents.In this paper,the vulnerability of karst groundwater in Wangjia Well Spring Area in Guizhou province was quantitatively evaluated by considering five influencing factors:protective cover(P),land use(L),epikarst development degree(E),infiltration conditions(I)and karst network development(K)through PLEIK model.The results show that the groundwater antifouling performance in the study area is mainly good and medium,accounting for 23.69%and 42.11%of the total area,respectively.The areas with poor and good antifouling performance accounted for 18.54%and 15.53%of the total area,respectively.The area with poor antifouling performance accounts for at least 0.13%of the total area.The surface karst zone,aquifer karst network and land use type are the main factors affecting the antifouling performance of karst groundwater in this area.The research results can provide some reference for groundwater environmental protection and pollution prevention in this area.