River density - Kasenmitsudo

Japanese: 河川密度 - かせんみつど

…For example, when faults or rock joints control, orthogonal (lattice-like) flow paths are formed, and when sedimentary rocks are inclined, parallel (parallel) flow paths may develop. The quotient obtained by dividing the total length of rivers in a river system by the drainage basin area is called river density, drainage system density, or valley density, and is an index of the development of the drainage network, that is, the degree of dissection. River basin [Matsuda Iwaya]. …

From [Watershed]

…The average elevation of a watershed is the sum of the volume of the part of the watershed that is higher than the minimum elevation divided by the watershed area, plus the minimum elevation. The development of rivers in a watershed is indicated by river density. River density is the sum of the length of all rivers in a watershed, including the main river and tributaries, divided by the watershed area. …

*Some of the terms that refer to "river density" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…たとえば，断層や岩石の節理に支配されると直交する(格子状)流路が形成されるし，堆積岩の傾斜に支配されると平行する(平行状)流路が発達することがある。一つの水系内の河川長を総計し，流域面積で割った商は河川密度または水系密度，谷密度と呼ばれ，水系網の発達状況すなわち開析度を示す指標になる。川流域【松田磐余】。…