T - thalweg 中文 - EN166

thalweg n.1.【地質學；地理學】河流谷底線。2.【法律】(國際...

thames
Through the analyses of characteristics of gully thalweg and soil erosion in upland and gully land , sediment sources in small watershed , sediment yield relationship between upland and gully and ecological functions of vegetation corridor , it is considered that vegetation corridor combined with land preparation measures may block runoff and sediment from upland and reduce the amount of soil erosion in a watershed by 54 . 5 % ~ 77 . 0 % 摘要在分析黃土高原地區的溝沿線、溝沿線上下溝間地和溝谷地土壤侵蝕特征、小流域泥沙來源、坡溝侵蝕產沙關系的基礎上，結合廊道的生態功能和以往的研究結果，認為在溝沿線的上部建立草灌與整地工程措施相結合的植物廊道，來攔蓄阻截溝間地的來水來沙，可使流域的土壤侵蝕量減少54 . 5 % ~ 77 . 0 % 。
The result reveales that the decrease of sediment transportation of the upper reaches results in riverbed scouring and coarsing on yidu reach ; the upper and lower shallow regions in shahong are separately deepened and broadened , while the thalweg in shihong is lowered , and nanyangqi is scoured and draw back … all the above may cause variation of the distribution pattern 結果表明，來沙量減少使宜都水道沖刷，沙泓上淺區沖刷下切，而下淺區以沖灘為主，石泓深泓沖刷下降，南陽磧沖刷縮小，分流格局有發生變化的趨勢。
First , according to measured data and literature , the river channel evolution rule and its reasons in the southern branch of the yangtze river are discussed from the perspectives of historic evolution , recent evolution and the tendency prediction of river channel evolution . besides , the local reservoir has been studied from the changes in thalweg and section as well as the calculation of local erosion and deposit . consequently , the stability and feasibility of reservoir construction in the river section are approved 首先根據大量實測資料及文獻資料，就歷史變遷、近期演變、河演趨勢預測等方面，初步探討了長江口南支河段河道演變規律及原因，并具體就深泓線的變化、主槽斷面變化、局部沖淤計算等方面對擬建水庫局部區域進行了分析，論證了工程河段建設水庫的穩定性及可行性。