Assessment of Precipitation Obtained from Gridded Data Bases in Southern Baluchestan Basin

Rezaei, Mohsen; ّAzhdary Moghaddam, MEHDI; Azizyan, Gholamreza; Shamsipur, Ali Akbar

doi:10.22034/jewe.2022.329479.1726

Document Type : Research Paper

Authors

¹ PhD Scholar, Department of Civil, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran

² Professor, Department of Civil, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran

³ Assoc. Professor, Department of Civil, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran

⁴ Assoc. Professor, Department of Climatology, Faculty of Geography, University of Tehran, Tehran, Iran

https://doi.org/10.22034/jewe.2022.329479.1726

Abstract

Precipitation is an important variable in hydrological studies. The high spatial and temporal variability of precipitation makes it difficult to monitor it with observations. The use of satellite data and weather models is a suitable solution for this problem. But, before using these data, their spatial and temporal accuracy should be considered. The aim of this study was to evaluate the accuracy of monthly precipitation data TRMM_3B43_V7, PERSIANN, and ECMWF-ERA5 in comparison with the data of 13 observation stations in the South Baluchestan basin during the period 2000 to 2018. For statistical evaluation of the mentioned data, the coefficient of determination (R²), N-S efficiency factor, the degree of bias (BIAS), index agreement (IA), and ratio root mean square error (RRMSE) were used. The results showed that the best performance was exhibited by TRMM (R²=0.624) and ERA5 (R²=0.562), respectively. PERSIANN data (R²=0.307) did not provide an accurate estimate of precipitation. TRMM data are usually better estimated in areas far from the sea, which usually have higher elevations and receive more precipitation. The TRMM data is overestimated and the ERA5 data is underestimated. Data from both databases performed better in the winter months.

Keywords

Main Subjects

Climatology

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Environment and Water Engineering

Assessment of Precipitation Obtained from Gridded Data Bases in Southern Baluchestan Basin

References

References

Volume 9, Issue 1
March 2023
Pages 61-76

Assessment of Precipitation Obtained from Gridded Data Bases in Southern Baluchestan Basin

References

References

Volume 9, Issue 1March 2023Pages 61-76

Volume 9, Issue 1
March 2023
Pages 61-76