鄂西丹水流域岩溶水流系统圈划与结构模式

Boundary Determination of Karst Groundwater Flow System and Its Structural Model in Danshui Basin, Western Hubei Province

鄂西丹水岩溶流域内碳酸盐岩与非碳酸盐岩的组合关系复杂,地表水与地下水的转化频繁,岩溶水资源开发利用评价难度极大。为服务后续岩溶区水资源开发利用和保护规划的编制,通过水文地质现场调查和分析的方法,在地球系统科学和水循环理论的指导下,提出丹水流域岩溶水流系统的划分方法。该方法遵从完整性和级次性原则,按照从整体到局部、从空间结构到水流运动的顺序,识别岩溶水流系统边界,并以地下水排泄方式的不同作为首要划分依据,综合考虑地层岩性、地表河网分布、蓄水构造、岩溶发育条件,将研究区划分为22个岩溶水流子系统,在此基础上概化了丹水流域岩溶水流系统的5种补给、径流和排泄的空间结构模式,可为该地区或者相似地区地下水资源评价与开发利用提供依据。

Danshui Basin is located in Changyang County, Yichang City, Hubei Province.There are both carbonate and non-carbonate rock in this basin, and surface water and groundwater convert frequently, which causes difficulties in development and utilization of karst groundwater resources.For further development, utilization and protection of water resources in the basin, through hydrogeological field investigation and analysis, based on the earth system science and water cycle theory, this paper proposes the boundary determination method of karst groundwater flow system of Danshui karst basin.By the method boundaries of the groundwater system is identified, from the whole to the part, from the spatial structure to the groundwater flow completely and hierarchically.Besides, with difference in groundwater drainage as the primary basis and consideration of the stratum lithology, surface river network, water storage structure, and karst development conditions, the study area is divided into 22 karst groundwater subsystems. On basis of this, five spatial structure patterns of recharge, runoff and discharge modes are generalized.This research will provide basis for evaluation, development and utilization of karst groundwater resources in this area and areas with similar conditions.