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Water 2014, 6(5), 1339-1359; doi:10.3390/w6051339
Article

Regional Calibration of SCS-CN L-THIA Model: Application for Ungauged Basins

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, 2
 and 3,*
Received: 11 March 2014; in revised form: 5 May 2014 / Accepted: 7 May 2014 / Published: 14 May 2014
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Abstract: Estimating surface runoff for ungauged watershed is an important issue. The Soil Conservation Service Curve Number (SCS-CN) method developed from long-term experimental data is widely used to estimate surface runoff from gaged or ungauged watersheds. Many modelers have used the documented SCS-CN parameters without calibration, sometimes resulting in significant errors in estimating surface runoff. Several methods for regionalization of SCS-CN parameters were evaluated. The regionalization methods include: (1) average; (2) land use area weighted average; (3) hydrologic soil group area weighted average; (4) area combined land use and hydrologic soil group weighted average; (5) spatial nearest neighbor; (6) inverse distance weighted average; and (7) global calibration method, and model performance for each method was evaluated with application to 14 watersheds located in Indiana. Eight watersheds were used for calibration and six watersheds for validation. For the validation results, the spatial nearest neighbor method provided the highest average Nash-Sutcliffe (NS) value at 0.58 for six watersheds but it included the lowest NS value and variance of NS values of this method was the highest. The global calibration method provided the second highest average NS value at 0.56 with low variation of NS values. Although the spatial nearest neighbor method provided the highest average NS value, this method was not statistically different than other methods. However, the global calibration method was significantly different than other methods except the spatial nearest neighbor method. Therefore, we conclude that the global calibration method is appropriate to regionalize SCS-CN parameters for ungauged watersheds.
Keywords: calibration; shuffled complex evolution algorithm; direct runoff; global optimization; watershed model; curve number method calibration; shuffled complex evolution algorithm; direct runoff; global optimization; watershed model; curve number method
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Jeon, J.-H.; Lim, K.J.; Engel, B.A. Regional Calibration of SCS-CN L-THIA Model: Application for Ungauged Basins. Water 2014, 6, 1339-1359.

AMA Style

Jeon J-H, Lim KJ, Engel BA. Regional Calibration of SCS-CN L-THIA Model: Application for Ungauged Basins. Water. 2014; 6(5):1339-1359.

Chicago/Turabian Style

Jeon, Ji-Hong; Lim, Kyoung J.; Engel, Bernard A. 2014. "Regional Calibration of SCS-CN L-THIA Model: Application for Ungauged Basins." Water 6, no. 5: 1339-1359.


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