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中文摘要：
将模糊数学的理论和方法引入到河网糙率计算中，通过多相模糊统计法和建立在模糊一致矩阵基础上的决策方案优选法，确定糙率模糊集的隶属函数及断面平均流速、水力半径、水面比降等因素的权重，最终由最大隶属度原则确定糙率所在的模糊子集，对河网糙率进行多因素模糊综合评判，可以将河网各河道糙率值控制在一较小区间范围内，再在该范围内对糙率值进行微调，确定最终糙率值．以珠江三角洲1998年7月洪水为例，对该方法进行验证，计算结果与实际结果相吻合．
英文摘要：
The theory and method of fuzzy mathematics are introduced into the calculation of roughness of river network. The polyphase fuzzy statistics and optimization of decision scheme based on fuzzy consistent matrix are applied to determine the membership function of roughness fuzzy set and the weight of some factors, such as the average sectional velocity, hydraulic radius, surface slope, etc. Finally, the roughness fuzzy subsets are determined by the principle of the maximum membership degree. Based on comprehensive multi-factor fuzzy evaluation of roughness of river network, the roughness of individual reaches can be limited to a small range, and through micro modification, the roughness obtained. The method is verified with the flood in July, 1998 in Pearl Delta, and the calculated results are agreement with the reality. is finally in good
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