S&T Project 19306 Geospatial Data: Bighorn River Geomorphology

Yellowtail Dam closed in 1966, changing the hydrologic, sediment, and temperature regimes for the Bighorn River in southeast Montana, allowing a cold-water trout fishery to thrive over the following decades. Reclamation conducted a series of studies to investigate the loss of habitat, geomorphic diversity, and river hydraulics in 35 kilometer reach of the Bighorn River immediately downstream from Yellowtail Dam, located near Fort Smith, Montana. The most recent project, S&T project 19306, conducted more recent geomorphic mapping from 2011 and 2017 to compare with earlier mapping and related studies. We observed large losses in geomorphic diversity between 1939 and 1980.

黄石尾大坝（Yellowtail Dam）于1966年截流蓄水，改变了蒙大拿州东南部大角河的水文、泥沙与温度情势，使得冷水性鳟鱼渔业在随后数十年间蓬勃发展。垦务局（Reclamation）针对位于蒙大拿州史密斯堡附近的黄石尾大坝下游紧邻的35千米大角河河段，开展了一系列研究，以探究该河段的栖息地流失、地貌多样性损失及河流水力学状况。其中最新的项目为S&T（Science and Technology）项目19306，该项目于2011年与2017年开展了最新地貌测绘，用于与早期测绘及相关研究进行对比分析。我们观测到，1939年至1980年间，该河段的地貌多样性出现大幅损失。