Comparative Analysis of Different Interpolation Methods in Modeling Spatial Distribution of Monthly Precipitation
For many water resources planning and management studies such as water budget and hydrological modeling, it is very important to estimate areal precipitation from point observation stations. There are many deterministic and geostatistical methods for determining the spatial distribution of precipita...
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Artvin Coruh University
2018-05-01
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| Series: | Doğal Afetler ve Çevre Dergisi |
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| Online Access: | http://dacd.artvin.edu.tr/tr/download/article-file/469243 |
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| author | Yılmaz İçağa Emin Taş |
| author_facet | Yılmaz İçağa Emin Taş |
| author_sort | Yılmaz İçağa |
| collection | DOAJ |
| description | For many water resources planning and management studies such as water budget and hydrological modeling, it is very important to estimate areal precipitation from point observation stations. There are many deterministic and geostatistical methods for determining the spatial distribution of precipitation. In this study, the most widely used methods, inverse distance weighting (IDW), Simple Kriging (SK) and Co-Kriging (CK) are applied. It is the main objective of the study that Geographic Information Systems (GIS) techniques are used to compare widely preferred interpolation methods and to model the spatial distribution of monthly precipitation values for prediction in ungauged areas in Akarcay Sinanpasa and Suhut sub-basins, Turkey. At the same time, the effects of number of stations, basin area, characteristics and secondary data usage such as elevation on model performance are investigated. The IDW, a deterministic method and the SK-CK, geostatistical methods are compared with each other by cross validation technique and the applicability of the interpolation techniques for the study areas is analyzed. According to the cross validation test results of IDW, SK and CK methods, the mean RMSE (root mean square error) values of Sinanpasa sub-basin are respectively 13,76 mm, 9,32 mm and 8,72 mm while these values are 9,43 mm, 7,82 mm and 7,90 mm for Suhut sub-basin. Then, uncertainty analysis by means of PSE (prediction standard error) is applied to SK-CK methods with clear advantages over the IDW method and with the close RMSE values. In consideration of the results of the uncertainty analysis, the SK method with the mean PSE values 10,30 mm and 8,54 mm has a little superiority to the CK method whose average PSE values are 11,03 mm and 9,02 mm for both Sinanpasa and Suhut sub-basins, respectively. When the findings are evaluated, it can be seen that all three methods can be used for the study areas. The determination of the spatial distribution of precipitation in this way is considered to be beneficial for many water resources engineering studies in areas of ungauged/sparsely gauged. |
| format | Article |
| id | doaj-art-9899f618abef495eaeb93cc6acc375e2 |
| institution | Kabale University |
| issn | 2528-9640 2528-9640 |
| language | English |
| publishDate | 2018-05-01 |
| publisher | Artvin Coruh University |
| record_format | Article |
| series | Doğal Afetler ve Çevre Dergisi |
| spelling | doaj-art-9899f618abef495eaeb93cc6acc375e22025-02-02T16:27:18ZengArtvin Coruh UniversityDoğal Afetler ve Çevre Dergisi2528-96402528-96402018-05-01428910410.21324/dacd.387061Comparative Analysis of Different Interpolation Methods in Modeling Spatial Distribution of Monthly PrecipitationYılmaz İçağa0Emin Taş1Afyon Kocatepe University, Faculty of Engineering, Department of Civil Engineering, 03200, Afyonkarahisar.Afyon Kocatepe University, Faculty of Engineering, Department of Civil Engineering, 03200, Afyonkarahisar.For many water resources planning and management studies such as water budget and hydrological modeling, it is very important to estimate areal precipitation from point observation stations. There are many deterministic and geostatistical methods for determining the spatial distribution of precipitation. In this study, the most widely used methods, inverse distance weighting (IDW), Simple Kriging (SK) and Co-Kriging (CK) are applied. It is the main objective of the study that Geographic Information Systems (GIS) techniques are used to compare widely preferred interpolation methods and to model the spatial distribution of monthly precipitation values for prediction in ungauged areas in Akarcay Sinanpasa and Suhut sub-basins, Turkey. At the same time, the effects of number of stations, basin area, characteristics and secondary data usage such as elevation on model performance are investigated. The IDW, a deterministic method and the SK-CK, geostatistical methods are compared with each other by cross validation technique and the applicability of the interpolation techniques for the study areas is analyzed. According to the cross validation test results of IDW, SK and CK methods, the mean RMSE (root mean square error) values of Sinanpasa sub-basin are respectively 13,76 mm, 9,32 mm and 8,72 mm while these values are 9,43 mm, 7,82 mm and 7,90 mm for Suhut sub-basin. Then, uncertainty analysis by means of PSE (prediction standard error) is applied to SK-CK methods with clear advantages over the IDW method and with the close RMSE values. In consideration of the results of the uncertainty analysis, the SK method with the mean PSE values 10,30 mm and 8,54 mm has a little superiority to the CK method whose average PSE values are 11,03 mm and 9,02 mm for both Sinanpasa and Suhut sub-basins, respectively. When the findings are evaluated, it can be seen that all three methods can be used for the study areas. The determination of the spatial distribution of precipitation in this way is considered to be beneficial for many water resources engineering studies in areas of ungauged/sparsely gauged.http://dacd.artvin.edu.tr/tr/download/article-file/469243areal precipitationspatial interpolationgisidwkriging |
| spellingShingle | Yılmaz İçağa Emin Taş Comparative Analysis of Different Interpolation Methods in Modeling Spatial Distribution of Monthly Precipitation Doğal Afetler ve Çevre Dergisi areal precipitation spatial interpolation gis idw kriging |
| title | Comparative Analysis of Different Interpolation Methods in Modeling Spatial Distribution of Monthly Precipitation |
| title_full | Comparative Analysis of Different Interpolation Methods in Modeling Spatial Distribution of Monthly Precipitation |
| title_fullStr | Comparative Analysis of Different Interpolation Methods in Modeling Spatial Distribution of Monthly Precipitation |
| title_full_unstemmed | Comparative Analysis of Different Interpolation Methods in Modeling Spatial Distribution of Monthly Precipitation |
| title_short | Comparative Analysis of Different Interpolation Methods in Modeling Spatial Distribution of Monthly Precipitation |
| title_sort | comparative analysis of different interpolation methods in modeling spatial distribution of monthly precipitation |
| topic | areal precipitation spatial interpolation gis idw kriging |
| url | http://dacd.artvin.edu.tr/tr/download/article-file/469243 |
| work_keys_str_mv | AT yılmazicaga comparativeanalysisofdifferentinterpolationmethodsinmodelingspatialdistributionofmonthlyprecipitation AT emintas comparativeanalysisofdifferentinterpolationmethodsinmodelingspatialdistributionofmonthlyprecipitation |