Geospatial Datasets and Surface-Water Hydraulic Model for the Patoka River in and near Jasper, Southwest Indiana, Flood-inundation Study

Digital flood-inundation maps for a 9.5-mile reach of the Patoka River at Jasper, Indiana, were created by the U.S. Geological Survey (USGS) in cooperation with the Indiana Department of Transportation. The flood-inundation maps, which can be accessed through the USGS Flood Inundation Mapping Science Web site at http://water.usgs.gov/osw/flood_inundation/, depict estimates of the areal extent and depth of flooding corresponding to selected water levels (stages) at the USGS streamgage on the Patoka River at Jasper, Indiana (station number 03375500). Near-real-time stages at this streamgage may be obtained from the USGS National Water Information System at http://waterdata.usgs.gov/ or the National Weather Service (NWS) Advanced Hydrologic Prediction Service at http://water.weather.gov/ahps/, site (SBVI3). Flood profiles were computed for the stream reach by means of a one-dimensional step-backwater model. The hydraulic model was calibrated by using the most current stage-discharge relation at the Patoka River at Jasper, Ind., streamgage. The calibrated hydraulic model was then used to compute five water-surface profiles for flood stages referenced to the streamgage datum and ranging from 15.0 feet, or near bankfull, to 19 feet, of the current stage-discharge rating curve. The simulated water-surface profiles were then combined with a Geographic Information System digital elevation model (derived from light detection and ranging [lidar] data having a 0.98-foot vertical accuracy and 4.9-foot horizontal resolution) to delineate the area flooded at each water level. The attached files on this landing page are the geospatial datasets and hydraulic model used to create flood-inundation maps for the referenced report, https://doi.org/10.3133/sir20175138. There are three child items that contain final geospatial datasets for the flood-inundation maps, (depth grids and shapefiles) and the hydraulic model with all necessary input documentation to run the model.

美国地质调查局（U.S. Geological Survey，USGS）联合印第安纳州交通运输部，针对印第安纳州贾斯珀市帕托卡河9.5英里河段制作了数字洪水淹没地图。该洪水淹没地图可通过USGS洪水淹没制图科学网站（http://water.usgs.gov/osw/flood_inundation/）获取，其描绘了对应印第安纳州贾斯珀市帕托卡河USGS水文测站（站号03375500）选定水位（水位高程）的洪水面积范围与深度估算值。该测站的近实时水位数据可从USGS国家水信息系统（http://waterdata.usgs.gov/）或国家气象局（National Weather Service，NWS）高级水文预报服务网站（http://water.weather.gov/ahps/，站点代号SBVI3）获取。本次研究通过一维回水模型对该河段的洪水演进过程进行了计算。该水力模型以印第安纳州贾斯珀市帕托卡河测站最新的水位-流量关系进行率定。随后，率定后的水力模型基于当前水位-流量关系曲线，针对以该测站基准面为参照的洪水水位高程（区间为接近满岸水位的15.0英尺至19英尺），计算得到5组水面线剖面。将模拟得到的水面线剖面与地理信息系统（Geographic Information System，GIS）数字高程模型（源自垂直精度0.98英尺、水平分辨率4.9英尺的激光雷达（light detection and ranging，lidar）数据）相结合，以此勾绘出各水位对应的淹没区域。本登录页面附带的文件，为制作参考文献报告（https://doi.org/10.3133/sir20175138）中的洪水淹没地图所使用的地理空间数据集与水力模型。其中包含3个子项，分别对应洪水淹没地图的最终地理空间数据集（包含深度栅格与形状文件），以及搭载全部必要输入文档、可直接运行该模型的水力模型。