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In the study of image processing, a watershed is a transformation defined on a grayscale image. The name refers metaphorically to a geological watershed , or drainage divide, which separates adjacent drainage basins .
GSSHA (Gridded Surface/Subsurface Hydrologic Analysis) [1] is a two-dimensional, physically based watershed model developed by the Engineer Research and Development Center of the United States Army Corps of Engineers. It simulates surface water and groundwater hydrology, erosion and sediment transport.
Watershed delineation is the process of identifying the boundary of a watershed, also referred to as a catchment, drainage basin, or river basin.It is an important step in many areas of environmental science, engineering, and management, for example to study flooding, aquatic habitat, or water pollution.
Version 9.2 introduced the use of XMDF (eXtensible Model Data Format), which is a compatible extension of HDF5. XMDF files are smaller and allow faster access times than ASCII files. The Watershed Modeling System (WMS) is a proprietary water modeling software application used to develop watershed computer simulations.
SWAT is a continuous time model that operates on a daily time step at basin scale. The objective of such a model is to predict the long-term impacts in large basins of management and also timing of agricultural practices within a year (i.e., crop rotations, planting and harvest dates, irrigation, fertilizer, and pesticide application rates and timing).
The scale of the model is 1:1000 on the horizontal axis and 1:100 on the vertical axis. The model operates at a time scale of 1:100. [6] The model is distorted by a factor of ten between the horizontal and vertical scales. The distortion is designed into the model to ensure a proper hydraulic flow over the tidal flats and shallows.
The photos in the book are meant to reflect those connections. He spent time with Indigenous people who catch salmon from the river's tributaries. He also spent time with farmers and ranchers who ...
In WEPP watershed applications, multiple hillslopes, channels, and impoundments can be linked together, and runoff and sediment yield from the entire catchment predicted. The model has been parameterized for a large number of soils across the U.S. and model performance has been assessed under a wide variety of land-use and