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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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汉江上游郧县五峰段史前大洪水水文学恢复研究
DOI: 10.11821/dlxb201311012, PP. 1568-1577
Keywords: 古洪水水文学,汉江上游,全新世,HEC-RAS模型
Abstract:
通过深入的野外考察，在汉江上游郧县五峰段多个地点发现全新世古洪水事件的沉积学记录，为恢复史前特大洪水事件的洪峰水位和洪峰流量提供了物质基础。在系统获取河道水文参数的基础上，采用ArcGIS耦合HEC-RAS模型，推算出其洪峰流量介于42220~63400m3/s之间。对于河槽糙率的灵敏度检验表明，给定糙率变化±25%，模型模拟得到的洪峰流量误差在-10.6%~6.3%之间。这个误差范围远小于采用比降—面积法获得的结果。同时，采用该模型和同样的参数，依据该河段现代大洪水洪痕高程，恢复推算其洪峰流量，其结果与实测数据误差在-3.9%~1.0%之间。与其它方法相比较，这种新方法有效地提高了水文参数选取准确性，使得古洪水水文恢复计算结果更为可靠。本研究为超长尺度大洪水水文学恢复提供了新的途径，也获得了汉江上游万年尺度特大洪水的水文学数据资料，对汉江上游水利水电枢纽工程建设、水资源调度和防洪减灾具有重要的现实意义。
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