Estimation of runoff in ungauged catchments using the Nash non-dimensional unit hydrograph (Case study: Ajay and Kasilian catchments)
Prediction of runoff is very important in ungauged catchments to design hydraulic structures. Estimation of the parameters of the rainfall-runoff in many cases is not simple. Therefore, hydrologists usually attempt to develop and apply simple and even accurate enough methods to model runoff in such...
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| Format: | Article |
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Marvdasht Branch, Islamic Azad University
2018-04-01
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| Series: | مهندسی منابع آب |
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| Online Access: | https://wej.marvdasht.iau.ir/article_3029_cbda38dee96c0c9bb465f527194c22b5.pdf |
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| author | pouan keshtkaran TOURAJ SABZEVARI mehdi karami moghadam |
| author_facet | pouan keshtkaran TOURAJ SABZEVARI mehdi karami moghadam |
| author_sort | pouan keshtkaran |
| collection | DOAJ |
| description | Prediction of runoff is very important in ungauged catchments to design hydraulic structures. Estimation of the parameters of the rainfall-runoff in many cases is not simple. Therefore, hydrologists usually attempt to develop and apply simple and even accurate enough methods to model runoff in such catchment. In this study, the Nash storage coefficient (k) was defined as a function of time of concentration by combining the Nash and Clark models and assuming the number of reservoir be 5. A non-dimensional equation to obtain synthetic unit hydrograph of catchments was presented based on the Nash instantaneous unit hydrograph. In the new equation flow discharge is a function of time and time of concentration. The model was used to simulate runoff in Kasilain catchment, North of Iran, and Ajay, India. The results showed that the efficiency coefficient for three of four events is higher than 0.82 for Kasilian and for four events varied from 0.78 to 0.89 for Ajay catchment. The error value for peak flow prediction was from 5.3 to 9.7 for the Kasilian catchment. The mean of error value for four events was 7.8 for Ajay. Generally, the accuracy of the prediction of the new model was shown to be satisfactory in the two catchments. |
| first_indexed | 2024-03-08T15:27:32Z |
| format | Article |
| id | doaj.art-7b0f0d8f179841c19c5efd71b8b4ae9e |
| institution | Directory Open Access Journal |
| issn | 2008-6377 2423-7191 |
| language | fas |
| last_indexed | 2024-03-08T15:27:32Z |
| publishDate | 2018-04-01 |
| publisher | Marvdasht Branch, Islamic Azad University |
| record_format | Article |
| series | مهندسی منابع آب |
| spelling | doaj.art-7b0f0d8f179841c19c5efd71b8b4ae9e2024-01-10T08:10:21ZfasMarvdasht Branch, Islamic Azad Universityمهندسی منابع آب2008-63772423-71912018-04-0111361103029Estimation of runoff in ungauged catchments using the Nash non-dimensional unit hydrograph (Case study: Ajay and Kasilian catchments)pouan keshtkaran0TOURAJ SABZEVARI1mehdi karami moghadam2عضو هیئت علمی گروه مهندسی عمران دانشگاه آزاد اسلامی واحد استهبان، استهبان، ایراندانشیار گروه مهندسی عمران دانشگاه آزاد اسلامی واحد استهبان، استهبان، ایراناستادیار، گروه کشاورزی، دانشگاه پیام نور، ایرانPrediction of runoff is very important in ungauged catchments to design hydraulic structures. Estimation of the parameters of the rainfall-runoff in many cases is not simple. Therefore, hydrologists usually attempt to develop and apply simple and even accurate enough methods to model runoff in such catchment. In this study, the Nash storage coefficient (k) was defined as a function of time of concentration by combining the Nash and Clark models and assuming the number of reservoir be 5. A non-dimensional equation to obtain synthetic unit hydrograph of catchments was presented based on the Nash instantaneous unit hydrograph. In the new equation flow discharge is a function of time and time of concentration. The model was used to simulate runoff in Kasilain catchment, North of Iran, and Ajay, India. The results showed that the efficiency coefficient for three of four events is higher than 0.82 for Kasilian and for four events varied from 0.78 to 0.89 for Ajay catchment. The error value for peak flow prediction was from 5.3 to 9.7 for the Kasilian catchment. The mean of error value for four events was 7.8 for Ajay. Generally, the accuracy of the prediction of the new model was shown to be satisfactory in the two catchments.https://wej.marvdasht.iau.ir/article_3029_cbda38dee96c0c9bb465f527194c22b5.pdfnon-dimensional unit hydrographnash modelungauged catchmentrunoff |
| spellingShingle | pouan keshtkaran TOURAJ SABZEVARI mehdi karami moghadam Estimation of runoff in ungauged catchments using the Nash non-dimensional unit hydrograph (Case study: Ajay and Kasilian catchments) مهندسی منابع آب non-dimensional unit hydrograph nash model ungauged catchment runoff |
| title | Estimation of runoff in ungauged catchments using the Nash non-dimensional unit hydrograph (Case study: Ajay and Kasilian catchments) |
| title_full | Estimation of runoff in ungauged catchments using the Nash non-dimensional unit hydrograph (Case study: Ajay and Kasilian catchments) |
| title_fullStr | Estimation of runoff in ungauged catchments using the Nash non-dimensional unit hydrograph (Case study: Ajay and Kasilian catchments) |
| title_full_unstemmed | Estimation of runoff in ungauged catchments using the Nash non-dimensional unit hydrograph (Case study: Ajay and Kasilian catchments) |
| title_short | Estimation of runoff in ungauged catchments using the Nash non-dimensional unit hydrograph (Case study: Ajay and Kasilian catchments) |
| title_sort | estimation of runoff in ungauged catchments using the nash non dimensional unit hydrograph case study ajay and kasilian catchments |
| topic | non-dimensional unit hydrograph nash model ungauged catchment runoff |
| url | https://wej.marvdasht.iau.ir/article_3029_cbda38dee96c0c9bb465f527194c22b5.pdf |
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