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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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基于对Leopold-Wolman关系修正的河床河型判别
DOI: 10.11821/xb200403017, PP. 462-467
Keywords: 河型,砾石河流,沙质河流,河型判别,比降,河宽
Abstract:
在广泛收集中国和世界上冲积河流资料的基础上,以近200条河流的大样本对著名的、国际上沿用40余年的Leopold-Wolman关系,即用于河型判别的比降-流量关系进行了检验。结果发现,该关系不能用于包括砾石与砂质河床在内的河型判别。这是由于比降-流量关系主要反映砾石河床与砂质河床之间差异,其次才反映分汊与弯曲河型之间的差异。为此,对于Leopold-Wolman关系进行了改进,提出了以比降和河宽来判别河型的新关系。这一关系综合反映了河流在纵向上的能耗、阻力与输沙特性与在横向上的流场与环流分布特性的组合关系,因而具有更好的河型判别效果,可以用于包括砾石与砂质河床在内的河型判别。
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