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Open AccessArticle

Research on the Influence of Small-Scale Terrain on Precipitation

1
School of Binjiang, Nanjing University of Information Science & Technology, Nanjing 210044, China
2
School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China
*
Author to whom correspondence should be addressed.
Academic Editor: María Fernández-Raga
Water 2021, 13(6), 805; https://doi.org/10.3390/w13060805
Received: 14 February 2021 / Revised: 7 March 2021 / Accepted: 13 March 2021 / Published: 15 March 2021
(This article belongs to the Special Issue Rainfall Measurement and Its Application)
Terrain plays an important role in the formation, development and distribution of local precipitation and is a major factor leading to locally abnormal weather in weather systems. Although small-scale topography has little influence on the spatial distribution of precipitation, it interferes with precipitation fitting. Due to the arbitrary combination of small, medium and large-scale terrain, complex terrain distribution is formed, and small-scale terrain cannot be clearly defined and removed. Based on the idea of bidimensional empirical mode decomposition (BEMD), this paper extracts small-scale terrain data layer by layer to smooth the terrain and constructs a macroterrain model for different scales in Central China. Based on the precipitation distribution model using multiple regression, precipitation models (B0, B1, B2 and B3) of different scales are constructed. The 18-year monthly average precipitation data of each station are compared with the precipitation simulation results under different scales of terrain and TRMM precipitation data, and the influence of different levels of small-scale terrain on the precipitation distribution is analysed. The results show that (1) in Central China, the accuracy of model B2 is much higher than that of TRMM model A and monthly precipitation model B0. The comprehensive evaluation indexes are increased by 3.31% and 1.92%, respectively. (2) The influence of different levels of small-scale terrain on the precipitation distribution is different. The first- and second-order small-scale terrain has interference effects on precipitation fitting, and the third-order small-scale terrain has an enhancement effect on precipitation. However, the effect of small-scale topography on the precipitation distribution is generally reflected as interference. View Full-Text
Keywords: small-scale terrain; spatial distribution of precipitation; precipitation model; topographic decomposition small-scale terrain; spatial distribution of precipitation; precipitation model; topographic decomposition
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MDPI and ACS Style

Gu, W.; Zhu, X.; Meng, X.; Qiu, X. Research on the Influence of Small-Scale Terrain on Precipitation. Water 2021, 13, 805. https://doi.org/10.3390/w13060805

AMA Style

Gu W, Zhu X, Meng X, Qiu X. Research on the Influence of Small-Scale Terrain on Precipitation. Water. 2021; 13(6):805. https://doi.org/10.3390/w13060805

Chicago/Turabian Style

Gu, Wenya; Zhu, Xiaochen; Meng, Xiangrui; Qiu, Xinfa. 2021. "Research on the Influence of Small-Scale Terrain on Precipitation" Water 13, no. 6: 805. https://doi.org/10.3390/w13060805

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