题目：被动水箱蓄量（passive storage）对喀斯特流域中水循环和同位素运移过程建模的影响
Effects of passive-storage conceptualization on modeling hydrological function and isotope dynamics in the flow system of a cockpit karst landscape
主讲人：2019级博士 李光轩
时间： 12月1日（周四）中午12：00
地点：16教学楼221会议室
报告摘要：
为了进一步提高水文-同位素耦合模型的模拟效果，相关研究引入了被动水箱蓄量（passive storage），但该方法在喀斯特流域的水文、同位素运移过程模拟的应用效果还有待商榷。因此，本次研究构建了能够反映快、慢速导水介质水流与蓄泄特征，以及山坡-洼地水力联系的半分布式喀斯特水文-氢氧同位素耦合模型，并通过在模型中的不同单元（山坡和洼地）和不同系统（快、慢速流系统）中设置被动水箱蓄量来确定最佳模型结构。研究结果表明，通过在山坡慢、快速流和洼地慢速流系统中配置1-3个被动水箱蓄量，有效提高了模型对径流和同位素过程的模拟精度，并能够反映山坡和洼地两单元之间的主要水流路径以及山坡单元与流域出口之间的连接方式。该研究有助于更精确刻画喀斯特流域山坡-洼地的水文结构和水流路径，提高流域降雨-径流过程模拟的准确性和模型预测精度。
Conceptualizing passive storage in coupled flow-isotope models can improve the simulation of mixing and attenuation effects on tracer transport in many natural systems, such as catchments or rivers. However, the effectiveness of incorporating different conceptualizations of passive storage in models of complex karst flow systems remains poorly understood. In this study, we developed a coupled flow-isotope model that conceptualizes both “fast” and “slow” flow processes in heterogeneous aquifers as well as hydrological connections between steep hillslopes and low-lying depression units in cockpit karst landscapes. The best model structure was identified by introducing passive storage in different units (hillsides and depressions) and different flow systems (fast and slow flow systems) of the model. Results show that one to three passive-storage zones distributed in hillslope fast/slow flow reservoirs and/or depression slow flow reservoirs provided optimal model structures in the study catchment. The best model structure also reflected the dominant flow paths and connections of the hillslope and depression units. This study helps to more accurately characterize the hydrological structure and flow paths of hillslopes-depressions in karst catchments, and improve the accuracy of rainfall-runoff process simulation.
