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Issue:
Derivation of DEM-based isochrones of watersheds
Author(s):
XIONG Lihua
,
PENG Dingzhi
Pages:
1
-
3,12
Year:
2003
Issue:
3
Journal:
ENGINEERING JOURNAL OF WUHAN UNIVERSITY(ENGINEERING EDITION)
Keyword:
数字高程模型
;
等流时线
;
汇流时间
;
Abstract:
根据流域等流时线的原理,详细探讨了基于数字高程模型(DEM)的等流时线的推导方法.根据汇流流速与地表坡度的水力学关系,提出了一个经验公式来计算水流流经DEM上每一栅格的时间.当水流流向采用多向分配法而不是单向流法时,提出了两种计算汇流时间的方案.在爱尔兰的一个中型流域上进行了应用研究.与传统的在地图上人工经验勾绘出来的等流时线相比,基于DEM的等流时线具有两个优点.一是能够充分反映流速空间变化的非均匀性,二是自动生成,当流域地形发生变化时,修改很容易.
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