若干特殊地表风蚀的风洞实验研究

经风洞模拟实验,本文对四种特殊地表在净风和挟沙风情况下的风蚀特性,进行了定量的研究。揭示了原始地表结构受人为破坏后,其抗风蚀能力急剧降低的特点。探讨了风成沙粒配、戈壁风蚀平衡与风蚀有关的几个问题。

A STUDY ON SOME SPECIAL GROUND WIND EROSION IN THE TUNNEL

The wind erosion features of the four typical ground are studied in the tunnel,in this paper,the imitated equations between wind erosion ratio(kg/m²·hr)and wind grade are expressed for some specific sonditions.In the process of the experiments,pure wind erodibilityand sand-carrying wind erodibility are considered in original and destroyed ground wind erosions.The resuIts of experiments indicate that the wind erosion ratio can be rapidly increased by sand-carrying wind or on the destroyed ground.Two significant phenomena are discovered,One is the existance of the process of gobi ground wind erosion balance,and another one is that eolian sand grain-size is related not only to the wind blowing time but also to thesource of sands and the change of wind grade.The experimental results provide important scientific basis for prevention and amelioration of wind erosion.