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Abstract
The kinetic energy (KE) of rainfall is an important parameter in estimating the rainfall erosivity factor, an essential parameter in the soil erosion equation. The global precipitation measurement dual-frequency precipitation radar (GPM DPR) can provide radar reflectivity at Ku- and Ka-band frequencies (Zku and Zka), rainfall rate (I, mm h−1), and drop size distribution parameters (mass-weighed mean diameter: Dm in mm and normalized intercept parameter: log10Nw, Nw in m−3 mm−1). The empirical relations between rainfall KE and GPM DPR parameters (KEtime–I, KEmm–Dm, KEtime–Zku, and KEtime–Zka relations) can allow us to estimate the KE at the locations where there are no ground-based measurements. In the present work, long-term measurements of impact type disdrometers located at three different locations (Zhongli, Feitsui, and Hsiayun) in north Taiwan are used to collect the raindrop size distribution (RSD) information of six seasons (spring, mei-yu, summer, autumn, winter, and typhoon). Measured RSDs in six seasons are used to estimate the rainfall intensity, mass-weighted mean diameter, rainfall KE flux (KEtime, J m–2 h−1), KE content (KEmm, J m−2 mm−1), radar reflectivity at Ku- and Ka-band frequencies. For the first time, present study establish and validate the rainfall KE functional relationships with GPM DPR data products (KEtime–I, KEmm–Dm, KEtime–Zku, and KEtime–Zka relations). The empirical relations between rainfall KE and GPM DPR parameters (I, Dm, Zku, and Zka) are established for six seasons of each disdrometer location. Derived KE relations did not show any spatial disparity for a given season, especially the KEmm–Dm, KEtime–Zku, and KEtime–Zka relations. On the other hand, a clear seasonal differences in the rainfall KE relations are noticed at each observational site. The established relations showed reasonable agreement in estimating the KE from the GPM DPR. However, in determining the KE, the KEmm–Dm relation showed outperformance over the remaining three relations (KEtime–I, KEtime–Zku, and KEtime–Zka relations).
Original language | English |
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Article number | 128754 |
Journal | Journal of Hydrology |
Volume | 617 |
DOIs | |
State | Published - Feb 2023 |
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Dive into the research topics of 'An assessment of rainfall kinetic energy functional relationships with GPM DPR'. Together they form a unique fingerprint.Projects
- 6 Finished
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氣象巨量資料應用在即時與極短期臺灣暴雨與強風的預報技術提升與相關災害防治-氣象巨量資料應用在即時與極短期臺灣暴雨與強風的預報技術提升與相關災害防治(2/2)
Lin, P.-L. (PI)
1/08/22 → 31/07/23
Project: Research
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臺灣區域豪雨觀測與預報實驗後續研究-梅雨與颱風季降雨微物理與邊界層熱動力特性之研究(總計畫及子計畫一)
Lin, P.-L. (PI)
1/08/22 → 31/10/23
Project: Research
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臺灣區域豪雨觀測與預報實驗後續研究-TAHOPE梅雨與颱風季降雨微物理與邊界層熱動力特性之研究(總計畫及子計畫一)
Lin, P.-L. (PI)
1/08/21 → 31/10/22
Project: Research