
Analysis of Precipitation Characteristics of Complex Terrain in Sichuan Province Based on Spatially Dense Rainfall Observation
Qiuxue ZHOU, Lan KANG, Keji LONG, Liangmin FENG
Analysis of Precipitation Characteristics of Complex Terrain in Sichuan Province Based on Spatially Dense Rainfall Observation
Based on the hourly precipitation data of 3454 stations with dense space in Sichuan Province and the high-precision grid elevation data, the characteristics of precipitation in flood season in 7 regions of Sichuan Province in recent 10 years were analyzed.The results showed that: (1) There were 3 maximum centers of rainfall in flood season in Sichuan Province: Ya 'an in the southwest of the basin, Anxian in the northwest of the basin and Yanbian in the south of Panxi area.Anxian was the center of heavy rainstorm, and the rainfall in flood season was mainly contributed by the weather process of R 24 ≥100 mm.(2) Affected by the trend of the mountains and the steepness of the terrain, the morphology and isoline gradient of the large value area around the basin had obvious differences.And the larger the accumulated rainfall in flood season, the more the sites were concentrated on the windward slope of the mountains.(3) The degree of night rain gradually weakened from southwest to northeast, among which Panzhihua was the most significant area of night rain in flood season.(4)The daily distribution of R 24 ≥25 mm heavy rainfall was closely related to topography, and the heavy rainfall stations were only distributed in the steep transition zone between the western basin and the plateau.In addition, the percentage of stations with hourly rain intensity ≥50 mm·h-1 in the rainstorm days in the northwest of the basin was the highest.(5) Compared with persistent heavy rain, the site distribution of persistent heavy rain was more significantly affected by the windward slope topography.
Sichuan / heavy rainfall / steep terrain / night rain / flood season {{custom_keyword}} /
Fig.4 Distribution of average total rain days (a), small and moderate rain days (b), heavy rain days (c), rainstorm rain days (d) and large rainstorm rain days (e) during flood season in Sichuan Province from 2013 to 2022.Unit: d图4 2013 -2022年四川省平均汛期总雨日(a)、 中小雨日(b)、 大雨日(c)、 暴雨日(d)和大暴雨日(e)分布(单位: d) |
Table 1 Days of rainstorm and large rainstorm in different areas, the ratio of the maximum number of stations reaching the standard and the maximum daily rainfall表1 不同地区暴雨和大暴雨的日数、 最大达标站数比率和最大日雨量 |
暴雨 | 大暴雨 | 最大日雨量 /mm | |||
---|---|---|---|---|---|
雨日数/d | 最大达标站数比率/% | 雨日数/d | 最大达标站数比率/% | ||
盆地东北部(E区) | 55 | 44.9% | 25 | 30.8% | 510.3 |
盆地西北部(A区) | 62 | 42.7% | 26 | 51.7% | 750.6 |
盆地西南部(B区) | 51 | 44.7% | 21 | 37.4% | 429.2 |
攀西地区(G区) | 53 | 23.4% | 13 | 4.4% | 332.8 |
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