the middle of the chief navigable channel of a waterway that forms the boundary line between states
Thalweg (;Oxford English Dictionary "valley way") in geography and fluvial geomorphology signifies the deepest continuous inline within a valley or watercourse system.Webster Dictionary
例句与用法
1.
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 首先根据大量实测资料及文献资料，就历史变迁、近期演变、河演趋势预测等方面，初步探讨了长江口南支河段河道演变规律及原因，并具体就深泓线的变化、主槽断面变化、局部冲淤计算等方面对拟建水库局部区域进行了分析，论证了工程河段建设水库的稳定性及可行性。
2.
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 结果表明，来沙量减少使宜都水道冲刷，沙泓上浅区冲刷下切，而下浅区以冲滩为主，石泓深泓冲刷下降，南阳碛冲刷缩小，分流格局有发生变化的趋势。
3.
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 % 摘要在分析黄土高原地区的沟沿线、沟沿线上下沟间地和沟谷地土壤侵蚀特征、小流域泥沙来源、坡沟侵蚀产沙关系的基础上，结合廊道的生态功能和以往的研究结果，认为在沟沿线的上部建立草灌与整地工程措施相结合的植物廊道，来拦蓄阻截沟间地的来水来沙，可使流域的土壤侵蚀量减少54 . 5 % ~ 77 . 0 % 。
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