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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Topographic Wetness Index ： ウィキペディア英語版 Topographic Wetness Index The topographic wetness index (TWI), also known as the compound topographic index (CTI), is a steady state wetness index. It is commonly used to quantify topographic control on hydrological processes. The index is a function of both the slope and the upstream contributing area per unit width orthogonal to the flow direction. The index was designed for hillslope catenas. Accumulation numbers in flat areas will be very large, so TWI will not be a relevant variable. The index is highly correlated with several soil attributes such as horizon depth, silt percentage, organic matter content, and phosphorus.〔 〕 Methods of computing this index differ primarily in the way the upslope contributing area is calculated. ==Definition== The topographic wetness index is defined as: $\backslash ln$ where 'a' is the local upslope area draining through a certain point per unit contour length and tan''b'' is the local slope in radians. The TWI has been used to study spatial scale effects on hydrological processes. The topographic wetness index (TWI) was developed by Beven and Kirkby within the runoff model TOPMODEL. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Topographic Wetness Index」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.