不同粒径下悬移质含沙量垂线分布公式的验证与比较

Verification of vertical distribution formula of suspended sediment concentration under different sediment grain sizes

泥沙扩散理论是研究悬移质含沙量垂线分布应用最广泛的理论。介绍扩散理论并评述由扩散理论衍生出的Rouse公式、张小峰公式以及Zagustin公式。分别采用粗颗粒及细颗粒泥沙实测资料对3个公式进行验证比较,并对验证结果进行分析。结果表明:在粗颗粒情况下张小峰公式精度较高;在细颗粒情况下3个公式与实测资料均有较大出入,但对分布指数进行修正后Rouse公式及Zagustin公式精度较高。

Sediment diffusion theory is widely used in the study of suspended load sediment concentration vertical distribution .The paper introduced diffusion theory that derives sand Rouse formula , Zhang Xi-aofeng formula and Zagustin formula .It used coarse and fine sediment to verify respectively the three for-mulas, and analyzed the results .The results show that under the condition of coarse particle , Zhang Xi-aofeng formula has more precision; under the condition of fine particle , there are large difference be-tween the results of three formulas and experiment data ,but Rouse and Zagustin formula show higher pre-cision after revising distribution index .