输沙量（率）水平分布的非均一性

The Distributive Heterogeneity of Sand-transporting Quantity (Rate) along Horizontal Direction

实验表明：输沙率沿风洞实验段横截面的水平分布具有明显的非均一性。其正负距平变幅可达平均值的４５－６０％。输沙率与有效起沙风成正比关系，其实验式为ｑ＝８．９５×１０（－１）（ＶＬ－Ｖｔ）（１．９）（ｇ／ｃｍ·ｍｉｎ），Ｖｔ＝５．０ｍ／ｓ。与Ｂａｇｎｏｌｄ，ＲＡ理论公式ｑ＝８．７０×１０（－２）（Ｖ－Ｖｔ）３相比（Ｖｔ＝４．０ｍ／ｓ），前者计算结果更接近室内外实测值。

The experiment results in wind tunnel show that the sand-transporting rate isdistributed in an obvious heterogeneity along the horizontal direction of the experiment crosssection. The range of variation of its positive and negative dapartune is 45 - 60% of averagevalue. The rate is proportional to the effective velocity of sand-driving wind. The experimentformula is q=8. 95×10-1(VL-Vt) 1. 9 (g/cm. min), Vt= 5. 0m/s. The results calculated fromthis formula are closer to the value actually determined in laboratory and field than those obtainedfrom R A Bagnold' s theoretical formula q=8. 70×10-2 (V-Vt)3, Vt=4. 0m/s.