headward erosion

Computational Method of Headward Erosion and Its Application

溯源冲刷的计算方法及其应用

Stream trenching and headward erosion are the very important inducement for slope failure .

河流下切与溯源侵蚀则成为岸坡失稳破坏的重要诱发因素。

The main drainage system in the source region of the Yangtze River formed at least by headward erosion a-long the faults of different natures generated by neotectonic movement during the Holocene .

长江源地区主要水系至少自全新世以来是沿新构造运动产生的不同性质断裂构造溯源侵蚀发育而成。

Human activities are an major factor of the formation of stony desert in the karst pimple plain , and peak forest basin on the water parting , where headward erosion can 't occur .

在河流溯源侵蚀尚未进入的分水岭上，残丘溶原、峰林盆地中，为岩溶生态良好区，但因不合理的人文开发诱发石漠。

By solving the simultaneous equations of the continuity equation of sediment discharge and the bed load formula , a two-order partial differential equation for the change of bed-level in the process of headward erosion is obtained .

联解沙量连续方程和推移质输沙公式，得溯源冲刷的河床高程随时间和距离变化的二阶偏微分方程。

Based on the solution of differential equations , this paper provides a formula to calculate the effectiveness of the reservoir headward erosion by lowering the water level behind the dam in any rate . Two control ways of scouring operation are chiefly analysed .

本文在求解溯源冲刷偏微分方程的基础上，给出了进库水沙以及坝前水位等均随时间变化的条件下，溯源冲刷输沙率、冲刷量以及冲刷河槽纵剖面变化过程的计算公式。

The speed of headward erosion of the gullies has been increased . The erosion speed of the gullies which are developed on the Yuanmou layer is about 50 cm / a , the maximum speed reached 200 cm / a.

冲沟溯源侵蚀速度加快，如元谋地层上发育的冲沟，年均溯源侵蚀速度50cm左右最大达200cm，沟谷密度一般为3～5km/km~2；

Gully is formed when land is dramatically degenerated in arid valley . In the Yuanmou arid hot valley of Jinsha river , the speed of headward erosion is 50 cm / a to develop gully , and the maximum speed reaches 200 cm / a.

冲沟是生态系统严重退化的产物，在金沙江流域元谋干热河谷发育的冲沟，溯源侵蚀速度为50cm／a，最大达200cm／a。