scholarly journals Hydrologic response to future land use change in the Upper Mississippi River Basin by the end of 21st century

2017 ◽  
Vol 31 (21) ◽  
pp. 3645-3661 ◽  
Author(s):  
Adnan Rajib ◽  
Venkatesh Merwade
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
River Basin ◽  
21St Century ◽  
Mississippi River ◽  
Mississippi River Basin ◽  
Hydrologic Response ◽  
Upper Mississippi River ◽  
Upper Mississippi River Basin

scholarly journals Effect of Watershed Delineation and Climate Datasets Density on Runoff Predictions for the Upper Mississippi River Basin Using SWAT within HAWQS

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 422
Author(s):  
Manyu Chen ◽  
Yuanlai Cui ◽  
Philip W. Gassman ◽  
Raghavan Srinivasan
Keyword(s):  
River Basin ◽  
Mississippi River ◽  
Lateral Flow ◽  
Mississippi River Basin ◽  
Hydrologic Response ◽  
Upper Mississippi River ◽  
Climate Data ◽  
Watershed Delineation ◽  
Monthly Streamflow ◽  
Upper Mississippi River Basin

The quality of input data and the process of watershed delineation can affect the accuracy of runoff predictions in watershed modeling. The Upper Mississippi River Basin was selected to evaluate the effects of subbasin and/or hydrologic response unit (HRU) delineations and the density of climate dataset on the simulated streamflow and water balance components using the Hydrologic and Water Quality System (HAWQS) platform. Five scenarios were examined with the same parameter set, including 8- and 12-digit hydrologic unit codes, two levels of HRU thresholds and two climate data densities. Results showed that statistic evaluations of monthly streamflow from 1983 to 2005 were satisfactory at some gauge sites but were relatively worse at others when shifting from 8-digit to 12-digit subbasins, revealing that the hydrologic response to delineation schemes can vary across a large basin. Average channel slope and drainage density increased significantly from 8-digit to 12-digit subbasins. This resulted in higher lateral flow and groundwater flow estimates, especially for the lateral flow. Moreover, a finer HRU delineation tends to generate more runoff because it captures a refined level of watershed spatial variability. The analysis of climate datasets revealed that denser climate data produced higher predicted runoff, especially for summer months.

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