Aerial photo mosaic of Hunter Creek, Oregon in 1965

Hunter Creek is an unregulated system that drains 115 square kilometers of southwestern Oregon before flowing into the Pacific Ocean south of the town of Gold Beach, Oregon. In cooperation with the U.S. Army Corps of Engineers, the U.S. Geological Survey completed a reconnaissance-level assessment of channel condition and bed-material transport relevant to the permitting of in-stream gravel extraction in the lower 12.4 kilometers Hunter Creek. To support these analyses, digital channel maps were produced to depict channel and floodplain conditions along the Hunter Creek system from different time periods. GIS layers defining the wetted channel and bar features and channel centerline of Hunter Creek were developed for four time periods: 1940, 1965, 2005, and 2009. For this project, the active channel was defined as area typically inundated during annual high flows, and includes the low-flow channel as well as side channels, islands, and channel-flanking gravel bars. The wetted channel and bar feature datasets were developed by digitizing from aerial photographs. Aerial photographs from 1940 and 1965 were scanned, rectified, and mosaicked for this project (See metadata for each photograph set for more information on the rectification process and resolution of each dataset). Digital orthophotographs from 2005 and 2009 are publicly available.

亨特溪（Hunter Creek）为无管制水系，流域面积达115平方千米，流经俄勒冈州西南部后，在俄勒冈州戈尔兹比奇镇以南注入太平洋。为配合美国陆军工程兵团（U.S. Army Corps of Engineers）的相关工作，美国地质调查局（U.S. Geological Survey）针对亨特溪下游12.4千米河段的河道状况与推移质输沙情况完成了踏勘级评估，该评估旨在为该河段河道内砾石开采的许可审批提供支撑。为支撑上述分析工作，研究团队生成了数字河道地图，用以呈现不同历史时期亨特溪水系的河道与河漫滩状况。研究团队针对四个时间节点——1940年、1965年、2005年及2009年——生成了亨特溪的过水河道、砾石滩坝特征以及河道中心线的地理信息系统（Geographic Information System, GIS）图层。本项目中将活动河道定义为年度高水位期通常会被淹没的区域，涵盖低水河段、支汊河道、江心洲以及河道两侧的砾石滩坝。过水河道与砾石滩坝特征数据集通过航空影像数字化手段生成：1940年与1965年的航空影像需经扫描、校正与镶嵌处理后方可用于本项目（有关校正流程与各数据集分辨率的详细信息，请参见各影像集的元数据文档）；2005年与2009年的数字正射影像为公开可获取资源。