A physically based model for calculating contributing area on hillslopes and along valley bottoms
A physically based model for calculating contributing area on hillslopes and along valley bottoms
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DOI：
10.1029/2003wr002576
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发表时间：
2003-12
影响因子：
5.4
通讯作者：
J. Lindsay
中科院分区：
文献类型：
--
作者：
J. Lindsay
现有的影响面积计算方法大多不能准确模拟山坡和沿着谷底的影响面积格局。本文提出了一种新的流量算法--可调色散路由算法（ADRA）。ADRA不是使用对景观中的位置不敏感的预定流动特性来计算贡献面积，而是预测通道位置并相应地调整流动特性。ADRA从分水岭开始增加下坡的水流发散程度，直到检测到渠道水头。根据用户定义的面积-斜率函数阈值估计渠首位置。该算法克服了坡面汇流和沿着谷底发散的问题。ADRA产生的集水区的模式进行了比较，使用类似的流量算法计算出的各种自然景观的类似模式。ADRA产生的贡献区的模式，更符合通道启动的理论。
Most existing methods of calculating contributing area are unable to accurately model the pattern of contributing area on hillslopes and along valley bottoms. This paper describes a new flow algorithm, the adjustable dispersion routing algorithm (ADRA). Rather than calculating contributing area using predetermined flow characteristics that are insensitive to location in the landscape, ADRA predicts channel location and adjusts flow characteristics accordingly. ADRA increases the degree of flow divergence downslope from divides until a channel head is detected. Channel head locations are estimated on the basis of a user‐defined threshold of an area‐slope function. Therefore the algorithm overcomes the problems of aggregated flow on hillslopes and divergent flow along valley bottoms. The pattern of catchment area produced by ADRA was compared with similar patterns calculated using a similar flow algorithm for a variety of natural landscapes. ADRA produced patterns of contributing area that were more consistent with the theory of channel initiation.