Relative changes in sediment supply and sediment transport capacity in a bedrock-controlled river

摘要: Rivers can be affected by multiple natural and human-induced changes to sediment supply transport capacity. Assessment of the relative importance these enables appropriate river management. Here assessments are made in capacity an 83 km section bedrock-controlled Coxs River, New South Wales, Australia. These estimated, turn, for land degradation, historical climate variations, dam closure. Measurements gully erosion extent from aerial photographs indicate that since European settlement average annual has increased a factor of-20. Rainfall records flow-gauging show shift mid- 1940s. On basis hydrologic modeling streamflow period mid-1940s is estimated have almost 3. Closure Lyell Dam 1982 stopped upper catchment. flow regulation abstraction at reduced long-term downstream 15%. The current after closure 2.6 times higher first half this century. In spite net increase huge volume delivered channel led widespread sand deposition along much river. Much bed was previously dominated bedrock now alluvial character. Only steepest reaches remain bedrock-dominated.