Application of GPM and TRMM precipitation products in estimating rainfall erosivity in Hengduan Mountains

doi:10.13474/j.cnki.11-2246.2025.0606

Abstract

Abstract: Rainfall erosivity is a key indicator to characterize the potential of rainfall and its runoff to cause soil erosion, and is often obtained through field data. However, in the vast plateau mountainous areas, meteorological stations are extremely scarce and unevenly distributed, resulting in poor data representativeness. How to select appropriate precipitation products has become a major problem in regional soil conservation prevention and control. To address this, this study takes the Hengduan Mountain area in northwestern Yunnan as an example, and combines ground-based field data to evaluate the applicability of three precipitation products, IMERG, T3B42 and TP1km, on annual, seasonal and monthly scales, and analyzes the spatio-temporal distribution characteristics of rainfall erosivity. The results show that: ①IMERG provides the most accurate rainfall estimates across all time scales;②On the annual scale, both IMERG and T3B42 tend to overestimate rainfall erosivity, while TP1km underestimates it; on the monthly scale, all three products underestimate it; ③Rainfall erosivity generally decreases from southwest to northeast. As a representative precipitation product of the global precipitation measurement(GPM), IMERG offers reliable rainfall erosivity information for this region.

Key words: meteorological satellite products, precipitation, rainfall erosivity, Hengduan Mountains, GPM, TRMM

CLC Number:

P237

DUAN Qiyan, CHEN Guokun, FENG Junxin, ZHANG Kaiqin, WANG Ying. Application of GPM and TRMM precipitation products in estimating rainfall erosivity in Hengduan Mountains[J]. Bulletin of Surveying and Mapping, 2025, 0(6): 30-36,77.

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