Performance Evaluation and Comparison of Satellite-Derived Rainfall Datasets over the Ziway Lake Basin, Ethiopia

Hordofa, Aster Tesfaye; Leta, Olkeba Tolessa; Alamirew, Tena; Kawo, Nafyad Serre; Chukalla, Abebe Demissie

doi:10.3390/cli9070113

Cited by 17 publications

(11 citation statements)

References 72 publications

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“…A study conducted by [65] in North Wollo, including the Kobo area, showed that CHIRPS rainfall has a strong correlation with observed rainfall. The authors of [66] also validated CHIRPS rainfall in the Zeway basin of Ethiopia and has a good correlation. Other studies in the upper Blue Nile Basin of Ethiopia by [27,35] confirmed that CHIRPS rainfall is suitable and performs well in the SWAT model simulation.…”

Section: Correlation Of Measured Streamflow and Reanalysis Glofas Flowmentioning

confidence: 91%

Hydrological Modeling of the Kobo-Golina River in the Data-Scarce Upper Danakil Basin, Ethiopia

et al. 2023

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A proper understanding of hydrological processes is vital for water resource assessment, management, and conservation at a local, national, and global scale. The role of hydrological models is critically important in rarely studied ungauged catchments including of Kobo-Golina, in the Danakil basin of Ethiopia. The main objective of this research is to model the hydrology of the Kobo-Golina catchment using the completely restructured SWAT (SWAT+) model. Validated reanalysis river flow from the Global Flood Awareness System (GloFAS) and actual evapotranspiration (AET) from Moderate Resolution Imaging Spectroradiometer (MODIS) were used for single and multi-variable calibration. It is found that the multi-variable calibration scenario reasonably attained the minimum satisfactory performance limit for both variables (NSE = 0.67, R2 = 0.68, PBias = −9.68%, and RSR = 0.57 for calibration of GloFAS flow; and NSE = 0.56, R2 = 0.63, RSR = 0.66, PBias = 3.86 for calibration of MODIS AET). The model simulation showed that evapotranspiration accounts for 47% of the input water while surface runoff, lateral flow, and groundwater recharge account for 30%, 1.53%, and 21.4%, respectively. The simulated mean annual streamflow at the Basin outlet is 10.6 m3/s. The monthly low flow occurs in June with a median flow of 1.43 m3/s and a coefficient of dispersion of 0.67. High flows occur in August, with a median flow of 16.55 m3/s and a coefficient of dispersion of 1.55. The spatial distribution of simulated runoff was depicted as being higher in the floodplains and along the riparian/drainage lines, whereas upland areas showed lower runoff. The maximum monthly recharge occurs in September with a recharge value of 78.2 mm. The findings of the study suggested that both surface water harvesting and groundwater exploitation can be sought in floodplain areas while conserving the uplands.

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Section: Correlation Of Measured Streamflow and Reanalysis Glofas Flowmentioning

confidence: 91%

Hydrological Modeling of the Kobo-Golina River in the Data-Scarce Upper Danakil Basin, Ethiopia

et al. 2023

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“…Data 5 harian CHIRP diagregasi ke hujan harian menggunakan data harian Climate Forecast System (CFS) NOAA resolusi 0,05 o . Tahap akhir yaitu penggabungan data CHIRP dengan data hujan observasi menggunakan algoritma pembobotan sehingga dihasilkan data CHIRPS (Hordofa, et al, 2021).…”

Section: Pendahuluan Latar Belakangunclassified

Validasi Curah Hujan Harian Chirps Precipitation Satellite Product Di Provinsi Kalimantan Barat

Suryanto

Amprin

Anisum

2023

JRPB

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Data curah hujan produk satelit dapat digunakan sebagai alternatif keterbatasan pengukuran curah hujan menggunakan penakar hujan. Akurasi data hujan satelit sangat bervariasi antar wilayah karena faktor lingkungan yang beragam, sehingga validasi hujan data satelit sangat diperlukan. Penelitian ini bertujuan untuk menguji akurasi data hujan harian Climate Hazards Group Infrared Precipitation with Stations (CHIRPS) pada 7 stasiun hujan di Provinsi Kalimantan Barat. Metode point-to-pixel digunakan untuk membandingkan curah hujan harian pengamatan Badan Meteorologi Klimatologi dan Geofisika (BMKG) sepanjang 20 tahun (2002 – 2021) dengan data curah hujan CHIRPS yang bersesuaian dengan lokasi stasiun hujan. Validasi data CHIPRS menggunakan dua jenis validasi yaitu validasi kontinu dan validasi kategorial. Validasi kontinu diperoleh rata-rata korelasi Pearson (R), percent bias (Pbias), mean error (ME), mean absolute error (MAE), dan root mean square error (RMSE) adalah 0,25, 9,92 %, 0,68 mm, 12,17 mm, dan 19,82 mm. Berdasarkan nilai rata-rata percent bias dan korelasi Pearson, estimasi hujan data CHIRPS sangat baik, namun mempunyai korelasi lemah dengan data pengamatan. Validasi kategorial diperoleh nilai rata-rata probability of detection (POD), false alarm ratio (FAR), critical success index (CSI), frequency bias index (FBI) dan Heidke skill score (HSS) adalah 0,72, 0,44, 056, 1,01, dan 0,27. Validasi kategorial menunjukkan bahwa data CHIRPS sangat baik dalam mengestimasi kejadian hujan di Kalimantan Barat.

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“…We evaluated the performance of the downscaled and bias-corrected CMIP5 models over the Ziway Lake Basin using monthly observations of rainfall, minimum temperature, and maximum temperature from 1983 to 2005 at eleven stations. We applied three statistical evaluation metrics that include percent bias (PBIAS), root mean square error (RMSE), and correlation coefficient (r) [42]. The foremost measures of time series data including climate change are trend analysis, which identifies the general increasing or decreasing tendencies of the climate variables [43].…”

Section: Climate Models Performance Evaluationmentioning

confidence: 99%

Spatiotemporal Trend Analysis of Temperature and Rainfall over Ziway Lake Basin, Ethiopia

et al. 2021

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Rainfall and temperature trends detection is vital for water resources management and decision support systems in agro-hydrology. This study assessed the historical (1983–2005) and future (2026–2100) rainfall, maximum temperature (Tmax), and minimum temperature (Tmin) trends of the Ziway Lake Basin (Ethiopia). The daily observed rainfall and temperature data at eleven stations were obtained from the National Meteorological Agency (NMA) of Ethiopia, while simulated historical and future climate data were obtained from the Coupled Model Intercomparison Project 5 (CMIP5) datasets under Representative Concentration Pathways (RCP) of 4.5 and 8.5. The CMIP5 datasets were statistically downscaled by using the climate model data for hydrologic modeling (CMhyd) tool and bias corrected using the distribution mapping method available in the CMhyd tool. The performance of simulated rainfall, Tmax, and Tmin of the CMIP5 models were statistically evaluated using observation datasets at eleven stations. The results showed that the selected CMIP5 models can reasonably simulate the monthly rainfall, Tmax, and Tmin at the majority of the stations. Modified Mann–Kendall trend test were applied to estimate the trends of annual rainfall, Tmax, and Tmin in the historical and future periods. We found that rainfall experienced no clear trends, while Tmax, and Tmin showed consistently significant increasing trends under both RCP 4.5 and 8.5 scenarios. However, the warming is expected to be greater under RCP 8.5 than RCP 4.5 by the end of the 21st century, resulting in an increasing trend of Tmax and Tmin at all stations. The greatest warming occurred in the central part of the basin, with statistically significant increases largely seen by the end of the 21st century, which is expected to exacerbate the evapotranspiration demand of the area that could negatively affect the freshwater availability within the basin. This study increases our understanding of historic trends and projected future change effects on rainfall- and evapotranspiration-related climate variables, which can be used to inform adaptive water resource management strategies.

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Performance Evaluation and Comparison of Satellite-Derived Rainfall Datasets over the Ziway Lake Basin, Ethiopia

Cited by 17 publications

References 72 publications

Hydrological Modeling of the Kobo-Golina River in the Data-Scarce Upper Danakil Basin, Ethiopia

Hydrological Modeling of the Kobo-Golina River in the Data-Scarce Upper Danakil Basin, Ethiopia

Validasi Curah Hujan Harian Chirps Precipitation Satellite Product Di Provinsi Kalimantan Barat

Spatiotemporal Trend Analysis of Temperature and Rainfall over Ziway Lake Basin, Ethiopia

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