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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 MODFLOW ： ウィキペディア英語版 MODFLOW MODFLOW is the U.S. Geological Survey modular finite-difference flow model, which is a computer code that solves the groundwater flow equation. The program is used by hydrogeologists to simulate the flow of groundwater through aquifers. The code is public domain free software, written primarily in Fortran, and can compile and run on Microsoft Windows or Unix-like operating systems. Since its original development in the early 1980s, the USGS have released four major releases, and is now considered to be the ''de facto'' standard code for aquifer simulation. There are several actively developed commercial and non-commercial graphical user interfaces for MODFLOW. == Groundwater flow equation == The governing partial differential equation for a confined aquifer used in MODFLOW is: :$\backslash frac\; \backslash left(K\_\; \backslash frac\; \backslash right)\; +\; \backslash frac\; \backslash left(K\_\; \backslash frac\; \backslash right)\; +\; \backslash frac\; \backslash left(K\_\; \backslash frac\; \backslash right)\; +\; W\; =\; S\_\; \backslash frac$ where *$K\_$, $K\_$ and $K\_$ are the values of hydraulic conductivity along the ''x'', ''y'', and ''z'' coordinate axes (L/T) *$h$ is the potentiometric head (L) *$W$ is a volumetric flux per unit volume representing sources and/or sinks of water, where ''negative'' values are extractions, and ''positive'' values are injections (T−1) *$S\_$ is the specific storage of the porous material (L−1); and *$t\backslash ,$ is time (T) 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「MODFLOW」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.