手法を比較

	HEC-RAS	Universal Soil Loss Equation
分野	地球物理学	地球物理学
系統	Process / pipeline	Process / pipeline
提唱年	1995	1978
提唱者	US Army Corps of Engineers Hydrologic Engineering Center	Waldo Wischmeier and Dwight Smith
種類	1D/2D river hydraulics and flood inundation modeling	Empirical soil erosion prediction model
原典	Brunner, G. W. (2010). HEC-RAS river analysis system hydraulic reference manual. US Army Corps of Engineers Hydrologic Engineering Center.	Wischmeier, W. H., & Smith, D. D. (1978). Predicting rainfall erosion losses: A guide to conservation planning. USDA Agricultural Handbook 537.
別名	HEC-RAS	USLE, Revised USLE
関連	3	3
概要	HEC-RAS (Hydrologic Engineering Center River Analysis System) is a hydraulic modeling software developed by the US Army Corps of Engineers that computes water surface elevation and velocity in open channels and floodplains, and depicts inundation extent and depth. Since its introduction in 1995, HEC-RAS has become the de facto standard for floodplain delineation, dam break analysis, and flood risk assessment for regulatory and engineering purposes.	The Universal Soil Loss Equation (USLE) is an empirical model that estimates annual soil loss due to sheet and rill erosion on hillslopes caused by rainfall and runoff. Developed by Wischmeier and Smith in 1978 from decades of erosion plot experiments, USLE has become a standard tool for erosion risk assessment, conservation planning, and best management practice design. The Revised USLE (RUSLE) updated the original model with improved factor algorithms.