会仙湿地岩溶水文系统活动地下分水岭迁移规律与影响机制研究

Huixian karst wetland was located in the watershed area of Gui river and Liu river, and with special geological background groundwater moved from central to the east and west side . The wetland groundwater system consists of two flow subsystems, in the middle of which the active watershed occured for the variation of precipitaiton. Many groundwater systems were also this type in the valley watershed between two basins in the karst area. Identify the underground watershed migration and effect mechanism was of great significance for the confirmation of groundwater system boundary and accurate evaluation of karst water resources . With groundwater flow field as the breakthrough point and combining hydrogeological in-depth analysis and groundwater observation and tracer test, the karst wetland hydrological model could be built using the conduit flow model MODFLOW-CFP. The flow field and the watershed movement will be simulated and the influence mechanism of active watershed movement by precipitation will be studied.

会仙岩溶湿地位于桂江和柳江两大流域的分水岭地带，独特的区域地质背景导致湿地地下含水系统中水流自中间向东西两侧排泄，构成2个地下水流动子系统，受降水补给变化中间形成活动地下分水岭。在岩溶区调查多处两大流域的谷地分水岭地带其地下水系统亦是此种类型。查明活动地下分水岭迁移与影响机制对地下水系统边界划分和岩溶水资源量准确计算具有重要意义。研究以分水岭地带地下水流场分析为切入点，结合水文地质调查、岩溶水动态观测以及示踪试验等方法，使用管道流模拟软件MODFLOW-CFP建立岩溶湿地水文模型，模拟地下含水系统流场分布和中间活动地下分水岭移动特征，探索降雨补给对活动地下分水岭的影响机制。