【摘要】 本文从恢复古地理环境入手,根据所掌握的地貌、气温、降水、水文等环境因素的情况,再按照现代情况下这些因素与径流深度、侵蚀模数之间的相关变化,推算得了潮白河流域内第四纪时期不同阶段的侵蚀强度,最后并用相关沉积数量进行了验证.更多还原

【Abstract】 By restoring the paleogeography environment, this paper studies the erosion action of the earth surface of the Chaobeihe River Basin in Quaternary period and obtains the following semiquantitative concepts:1 ) Since Quaternary period there has been several times of changes in temperature, from high to low with the amplitude 8-9 ℃. and in the mean annual rainfall, from dry to moisture with the maximum fluctuation range of 400mm. According to the amount of the rainfall and taking the temperature as a parameter, the value of the runoff depth in different stages are obtained,having the ratio 9 of the maximum to the minimum value.2 ) Still taking the temperature as a parameter and making the relation of the erosion intensity ( expressed in terms of the erosion modulus ) to mean annual runoff depth, a series of the erosion modulus in different stages of Quaternary period in this basin are obtained and as showing in the following tab.3 ) The result, from calculating the accumulated amount of the alluvial fan of the Chaobeihe River, shows that there is the evolution process of accumulated amount corresponding to the above mentioned erosion process. So it seems reliable.更多还原