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首页> 外文期刊>Arabian journal of geosciences >Spatio-temporal evolution characteristics of precipitation in the north and south of Qin-ba Mountain area in recent 43 years
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Spatio-temporal evolution characteristics of precipitation in the north and south of Qin-ba Mountain area in recent 43 years

机译：近43年来秦巴山区南北和南部降水的时空演化特征

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摘要

Using the daily precipitation data at 89 stations during 1975-2017 in the Qin-ba Mountain area, variation characteristics of different-grade precipitation in the north and south of the Qin-ba Mountain area are analyzed by the linear regression, Mann-Kendall test, and correlation analysis, based on the precipitation grade classification standard proposed by Dai Aiguo and the division of the geo-ecological boundary in mountain range presented by Kang Muyi. The results are as follows: (1) Light rain occurs most frequently, and the percentage of light rain in the north is twice that of the southern region. Rainstorms are the most rare. Precipitation above 800 mm mainly occurs south of the study area, and the result is consistent with the boundary between the north and south of the precipitation. (2) The beginning of precipitation mainly occurs in early April. The high precipitation concentration (PCD) in the north is an important reason for the debris flow disaster. The north-south precipitation concentration period (PCP) is about 1 month ahead of the central part. (3) In the past 43 years, the overall precipitation in the Qin-ba Mountain area has shown a decreasing trend, with the frequency of light rain and the percentage of heavy rain decreasing year by year. (4) The frequency of light rain is negatively correlated with other frequencies. In addition, the fewer days of precipitation, the later the precipitation concentration period (PCP) occurs, which means that the disaster occurs later.
机译：在1975 - 2017年在秦巴山区的89个站点使用日降水数据，通过线性回归，Mann-Kendall测试分析了秦山区南北和南部不同级降水的变化特性基于傣族AIGUO提出的降水等级分类标准和康MUYI展示的山脉地球生态边界划分的相关性分析。结果如下：（1）淡雨最频繁地发生，北方的小雨百分比是南部地区的两倍。暴雨是最罕见的。在800毫米以上的降水主要发生在研究区域的南部，结果与降水南部和南部之间的边界一致。 （2）降水的开始主要发生在4月初。北方的高沉淀浓度（PCD）是碎片流动灾难的重要原因。南北降水集中期（PCP）大约在中央部分前1个月。 （3）在过去的43年里，秦巴山区的整体降水表现出了趋势下降，随着小雨的频率和较小的雨量百分比逐年减少。 （4）小雨的频率与其他频率负相关。此外，降水日越少，后来沉淀浓度期（PCP）发生，这意味着灾难发生后来。

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