Hydrogeologic Controls on the Groundwater Interactions with an Acidic Lake in Karst Terrain, Lake Barco, Florida
Hydrogeologic Controls on the Groundwater Interactions with an Acidic Lake in Karst Terrain, Lake Barco, Florida
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DOI：
10.1029/96wr00162
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发表时间：
1996-04
影响因子：
5.4
通讯作者：
Terrie M. Lee
中科院分区：
文献类型：
--
作者：
Terrie M. Lee
对佛罗里达中北部地幔岩溶区的一个酸性渗漏湖--巴可湖进行了瞬态地下水相互作用和湖泊水位模拟。岩溶沉降特征影响了盆地地下水的流动模式和地下水进出湖泊的通量。沉降特征周边的湖泊拦截潜在的地下水流入，并增加了泄漏浅周边的湖床。模拟的地下水通量进行了检查，对净地下水流量来自一个详细的湖泊水文预算与短期湖泊蒸发计算的能量预算方法。模拟和推导出的净地下水流量之间的差异表明，该模型低估了地下水流入，可能是由瞬态水位附近的湖泊土堆。降雨回灌减少的湖泊渗漏比增加的地下水流入量多10至15倍。由于岩溶环境，贡献的地下水盆地的湖泊是2.4公顷的模拟平均降雨量条件下，相比之下，地形派生的流域面积为81公顷。短的地下水流入路径线和快速的旅行时间限制了来自盆地的酸中和溶质的贡献，使巴可湖容易受到酸雨的酸化。
Transient groundwater interactions and lake stage were simulated for Lake Barco, an acidic seepage lake in the mantled karst of north central Florida. Karst subsidence features affected groundwater flow patterns in the basin and groundwater fluxes to and from the lake. Subsidence features peripheral to the lake intercepted potential groundwater inflow and increased leakage from the shallow perimeter of the lake bed. Simulated groundwater fluxes were checked against net groundwater flow derived from a detailed lake hydrologic budget with short-term lake evaporation computed by the energy budget method. Discrepancies between modeled and budget-derived net groundwater flows indicated that the model underestimated groundwater inflow, possibly contributed to by transient water table mounding near the lake. Recharge from rainfall reduced lake leakage by 10 to 15 times more than it increased groundwater inflow. As a result of the karst setting, the contributing groundwater basin to the lake was 2.4 ha for simulated average rainfall conditions, compared to the topographically derived drainage basin area of 81 ha. Short groundwater inflow path lines and rapid travel times limit the contribution of acid-neutralizing solutes from the basin, making Lake Barco susceptible to increased acidification by acid rain.