型地貌瞬时单位线计算公式
1.形态定量率
（1）河数律：
（2）河长率：
（3）面积率：
（4）比降率：
式中，
，
，
，
分别为级河流数 、平均河长、平均面积及平均比降；
，
，
，
为分叉比、河长比、面积比及比降比；
为流域级别。
2. 
型地貌瞬时单位线计算公式
式中，
为瞬时单位线；
为雨滴经过该路径的概率；
为在路径S上雨滴的等候时间密度函数；
为参数，且
；
为雨滴在路径上的起涨时间，可以表示为
，
为第
条路径坡面状态至流域出口的最近距离，
为状态转移概率，
为分叉比，
为汇流速度。
3.路径概率
设路径
为： 
式中，
为路径概率；
为初始概率；
为状态转移概率。
（1） 转移概率：
式中，
为转移概率。
（2）初始概率：
式中，
为初始概率；
为状态。
参考文献：
靳长兴：
型地貌瞬时单位线探讨。地理研究，1990，9(4)
The Great Artesian Basin, also known as the "Great Australian Basin", is the world's third largest basin and the world's largest gravity basin. In Australia, is the world's largest gravity basin, located in the eastern part of the Australian mainland. In the Australian rock layer, covered with impermeable layer, the eastern part of the rain, the formation of water, groundwater flow at an annual rate of 11 to 16 meters flowing to the western region. Confined water through the drilling or natural springs and other gushing surface, so the river basin hence the name. The development of animal husbandry in Australia benefited from this unique terrain.
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