Short Pump, Virginia Discharge Evaluation

ArcGIS was used to calculate parameters for the Soil Conservation Service (SCS) Unit Hydrograph to study the change in discharge data after changes in land use/cover because of the construction 1.3million Square-Foot Mall. The area being studied is in Short Pump Virginia where major retail and housing construction has occurred. The main focus is to observe the changes in discharge trends before and after Short Pump Town Center was built in 2003. The Soil Conservation Service also uses a Curve Number method that takes into account land use/cover, hydrological soil groups, and geography of the watershed. These parameters are then used in The Hydrologic Modeling System (HEC-HMS) designed by the US Army Corps of Engineers to model frequency storms. In the future observed discharge data was also collected to compare the accuracy of the HEC-HMS models.本研究借助ArcGIS软件计算土壤保持服务局（Soil Conservation Service，SCS）单位线的相关参数，以分析130万平方英尺购物中心建设引发土地利用/覆被变化后，径流数据的变化特征。研究区域位于美国弗吉尼亚州肖特庞普（Short Pump）地区，该区域曾实施大规模零售及住宅建设工程。本研究的核心观测内容为2003年肖特庞普城镇中心（Short Pump Town Center）建成前后的径流趋势变化。土壤保持服务局还采用了径流曲线数（Curve Number）法，该方法综合考量流域的土地利用/覆被、水文土壤组及流域地理特征。将上述参数代入由美国陆军工程兵团研发的水文模拟系统（Hydrologic Modeling System，HEC-HMS），以模拟频率暴雨事件。本研究同时收集了实测径流数据，用于对比验证HEC-HMS模型的模拟精度。