Evaluation of the Swat Model on a Coastal Plain Agricultural Watershed

Abstract

ABSTRACT. The Better Assessment Science Integrating point and Nonpoint Sources (BASINS) system was developed by the U.S. Environmental Protection Agency to facilitate developing total maximum daily loads (TMDLsater is our most valuable resource. Realizing its value, states and nations often argue over water rights and protection. An increasing awareness of the value of water has resulted in considerable improvement in water conservation and preservation. Over the past 20 years, substantial reductions have been achieved in the discharge of pollutants into the lakes, rivers, wetlands, estuaries, coastal waters, and groundwater. Despite significant progress in reducing pollution, over 40% of the assessed waters in the U.S. still do not meet set standards (www.epa.gov/owow/tmdl/). These waters amount to over 20,000 individual river segments, lakes, and estuaries, including nearly 500,000 km of rivers and shorelines and approximately 2 million ha of lakes.

The Application of a Modified Version of the SWAT Model at the Daily Temporal Scale and the Hydrological Response unit Spatial Scale: A Case Study Covering an Irrigation District in the Hei River Basin

“…Among these models, SWAT is one of the best for the long-term simulation of watersheds dominated by agricultural land use. For example, SWAT has been used to evaluate the influence of irrigation diversion on river flow [4,[6][7][8][9], to simulate climate change and the associated effects under various scenarios [10,11], to calculate nutrient and sediment yields [12], and to estimate the water balance [13]. SWAT can be effectively calibrated, by comparing the sediment yield and/or simulated surface runoff and nutrient concentrations in runoff to observations at the outlets of watersheds at the subbasin level or at large spatial scales [7,[14][15][16][17][18].…”

Incremental model breakdown to assess the multi-hypotheses problem

“…The model, however, reacts directly to this as its input data is resolved in a 24 h time step. Therefore, we shifted the simulated time series one day into the future as proposed by Bosch et al (2004). This led to better calibration results.…”

Assessment of impact of climate change on water resources in a hilly river basin

“…SWAT is a continuous (daily or sub-daily), semi-distributed, process-based river basin model. It is designed to simulate surface flow, sub-surface flow, soil erosion, sediment deposition, nutrient fate, and movement in the basin using empirical and physically based equations (Bosch et al 2004;Arnold and Fohrer 2005;Jayakrishnan et al 2005;Krysanova and Arnold 2008). There are three important components: sub-basin, reservoir routing, and channel routing in a SWAT model.…”