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OALib Journal期刊
ISSN: 2333-9721
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侵蚀沉积模型在嘉陵江流域的应用
DOI: 10.11821/xb200401017, PP. 136-142
Keywords: 泥沙,沉积,侵蚀模型,嘉陵江
Abstract:
从20世纪50年代到80年代长江宜昌水文站观测的泥沙输送量逐年增加，但是到了90年代却出现了逐渐减少的趋势。泥沙量增加的原因主要是乱伐森林和土地利用方式的快速改变，而减少的原因则可能是采取了一系列防止水土流失的对策和在上游修建了许多大坝而造成的。嘉陵江流域是长江泥沙的主要源区之一，90年代每年从嘉陵江流域到长江的输沙量减少到1988年前的约36%。因此，分析该流域每年泥沙输送动态及其变化原因，对制定减小水土流失的森林规划，防止三峡水库的淤积以及保护长江流域的生存环境和生态系统等具有重大意义。本研究开发并改进了一个流域集水坡面上的侵蚀模型，并将它应用到1987年的嘉陵江流域，以对其适用性进行了研究。结果表明，该模式可被用于月度泥沙生产量的评估中。
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