Sprague River Oregon Vegetation 1940

The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S. Fish and Wildlife Service, the USGS and University of Oregon conducted a study to evaluate channel and floodplain processes for the 131 km of the Sprague River and its major tributaries, including the lower 20 km of the South Fork Sprague River, the lower 16 km of the North Fork Sprague River, and the lower 62 km of the Sycan River. The study involved multiple analyses, including assessments of historical channel change, riparian and floodplain vegetation, and surficial geology. To support these analyses, digital floodplain and channel maps were prepared from historic notes, maps, and aerial photos to depict channel and floodplain conditions at different times between 1866 and 2005. The geospatial database of current and historic channel and floodplain conditions will also enable evaluation of long-term trends pertaining to aquatic and riparian habitat conditions.

斯普劳格河（Sprague River）流经俄勒冈州中南部，流域面积达4090平方公里，最终注入威廉姆森河（Williamson River）与上克拉马斯湖（upper Klamath Lake）。美国地质调查局（USGS）与俄勒冈大学（University of Oregon）联合美国鱼类及野生动物管理局（U.S. Fish and Wildlife Service）开展了一项研究，针对斯普劳格河及其主要支流共计131公里的河段，评估河道与河漫滩（floodplain）过程。涉及的支流包括南支斯普劳格河下游20公里、北支斯普劳格河下游16公里以及赛坎河（Sycan River）下游62公里。该研究包含多项分析内容，涵盖历史河道变迁评估、河岸带（riparian）与河漫滩植被调查以及表层地质学（surficial geology）研究。为支撑上述分析工作，研究团队基于历史档案资料、历史地图与航空影像制作了数字河漫滩与河道地图，用以呈现1866年至2005年间不同时期的河道与河漫滩状态。这套涵盖当前与历史河道及河漫滩状态的地理空间数据库（geospatial database），还可用于评估与水生栖息地及河岸栖息地相关的长期变化趋势。