| Autor: |
Deshpande, Gauri, Amit Dhorde, Anargha |
| Zdroj: |
Modeling Earth Systems and Environment; April 2024, Vol. 10 Issue: 2 p1615-1629, 15p |
| Abstrakt: |
The Soil Conservation Services Curve Number model (SCS-CN) is well documented and should be applied in emerging land uses like dynamic urbanizing watersheds. The present research attempts at primarily to investigate the reliability of Curve Number (CN) method in the urbanizing watershed of Upper Bhima from Western Maharashtra for runoff estimation and secondarily validating the CNs using two approaches at basin scale from storm event data. The mean CNtabfor the basins were generated using the standard SCS-CN tables whereas event-based rainfall–runoff data was employed to compute the CNempfor eight basins. It was observed that the CN obtained by both methods does not vary significantly for almost all the basins. The uncertainty analysis reveals that there is least uncertainty in these CNs based on mean conditions. All the basins follow the standard behavior pattern wherein curve numbers reach an asymptote level at a lower end of the CNs. In case of most of the basins, the measured and simulated runoff values have little deviation. The Nash–Sutcliffe Efficiency (NSE) test results yielded higher results indicating that the model used for estimation (SCS-CN) has a higher performance rating and low level of uncertainty. The coefficient of determination (r2or D) values for all the basins were well above 0.70 and the correlation between estimated and measured runoff was significant at 0.05 level. The moderate to very low level of uncertainty in the functioning of the SCS-CN model and satisfactory to very good ratings on the performance scale for all the basins indicates that the procedure adopted for the estimation of runoff in these watershed would yield high level of certainty in the results. |
| Databáze: |
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