摘要
切沟侵蚀过程既是侵蚀输沙发生变化过程,也是其侵蚀地貌的发展演变过程,为了说明切沟形态随时空演化过程,应用质量守恒原理和理论分析方法,论述切沟侵蚀过程与形态发育模型实现的原理和过程,建立切沟侵蚀输沙微分方程、下切方程,并进行数值模拟。通过模拟计算,得到不同时刻和不同坡长下的切沟底部高程变化数据;经过与坡沟系统模型试验观测结果进行比较检验,沟深平均相对误差在15%以内,取得了较高的模拟精度。这表明建立的模型合理,模拟结果与实际切沟下切的动态变化过程相符,可以用于模拟切沟下切发育过程。
Gully erosion is not only the process of sediment transportation but also the evolution and development of the landscape.To explain temporal and spatial variation of gully morphology,based on the equations of mass conservation and theoretical analysis method,principles and process of establishment of models illustrating the gully erosion and morphological development were discussed,furthermore,differential equation of sediment transportation due to gully erosion and equation of gully incision were established to simulate gully erosion.The simulation were conducted and verified during rainfall processes.Compared with measured data of hillyslope-gully system,model simulating gully erosion shows a high precision with error less than 15%.It means that the equations of gully incision and sediment transportation can be used in the simulation of gully formation.
出处
《中国水土保持科学》
CSCD
2012年第1期19-24,共6页
Science of Soil and Water Conservation
基金
国家自然科学基金"黄土丘陵区切沟侵蚀过程的三维数值模拟研究"(41171224)
陕西省自然科学基金"黄土丘陵区切沟发育过程侵蚀预报模型研究"(2009jm5008)
关键词
坡沟系统
切沟侵蚀
数值模拟
切沟形态
hillyslope-gully system
gully erosion
numerical simulation
gully morphology
