﻿ 河南省西部山区降水特征分析 Analysis of Characteristics of Precipitation in the Western Mountainous Area in Henan Province

Open Journal of Nature Science
Vol. 07  No. 06 ( 2019 ), Article ID: 32879 , 7 pages
10.12677/OJNS.2019.76063

Analysis of Characteristics of Precipitation in the Western Mountainous Area in Henan Province

Binglu Shen

School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu Sichuan

Received: Oct. 17th, 2019; accepted: Nov. 1st, 2019; published: Nov. 8th, 2019

ABSTRACT

Based on the time-lapse precipitation data from 28 stations in the western mountainous area of Henan Province from 2014 to 2016, the daily variation of precipitation in the western mountainous areas and the temporal and spatial evolution of different precipitation levels and precipitation durations were analyzed. The study found that the daily change of precipitation, precipitation frequency and precipitation intensity is significant, in which the precipitation intensity contributes the most to the precipitation; the precipitation contribution rate of each precipitation in the western mountainous area shows a linear increase trend with a slight decrease after the precipitation duration, while the precipitation incidence is obvious. The power exponential type shows a decrease trend; the precipitation contribution rate and precipitation rate of each precipitation level in the western mountainous areas show a trend of decreasing power index with the gradual increase of precipitation level, and the frequency of light rain is the highest; in addition, statistical analysis shows for precipitation in the mountainous area of western Henan, there is a significant negative correlation between quantity and latitude.

Keywords:Mountain Area, Precipitation Duration, Precipitation Level, Precipitation Contribution Rate, Precipitation Incidence

1. 引言

2. 资料和方法

2.1. 资料

2.2. 方法

${r}_{kl}=\frac{1}{n}\underset{i=1}{\overset{n}{\sum }}\left(\frac{{x}_{ki}-{x}_{k}}{{s}_{k}}\right)\left(\frac{{x}_{li}-{x}_{l}}{{s}_{l}}\right)$ (1)

3. 结果和分析

3.1. 河南省西部山区降水日变化特征

3.2. 河南省西部山区降水结构时空演变规律

3.2.1. 山区降水历时变化特征

Figure 1. Daily variation curve of average precipitation, precipitation frequency and precipitation intensity in the western mountainous area of Henan Province

Figure 2. Precipitation incidence, precipitation contribution rate and site error line of different durations in the mountainous area of western Henan Province

Figure 3. The spatial distribution of occurrence and contribution rate for 1 to 3 hours

Figure 4. The spatial distribution of occurrence and contribution rate for 4 to 6 hours

Figure 5. The spatial distribution of occurrence and contribution rate for 7 to 12 hours

Figure 6. The spatial distribution of occurrence and contribution rate over 12 h

3.2.2. 山区降水等级变化特征

3.3. 地理位置对降水量的影响

Table 1. Correlation coefficient and significance of longitude, latitude and altitude with precipitation (sample size N = 28)

*为在置信度(双测)为0.05时，相关性是显著的。无*表示没有达到0.05。

4. 结论

1) 降水频次、降水强度日变化显著，降水频次的日变化是为一个单峰值结构，峰值出现在下午4时。降水量和降水强度日变化的振幅较大，重合度较高，即降水强度对降水量贡献较大。综合来看，降水主要发生在下午15时至夜间，与强度密切相关。

2) 西部山区各个降水历时的降水贡献率整体随降水历时的增大呈现先略有减少后增加的一个线性增加的趋势，而降水发生率则呈明显的幂指数型减小趋势。西部山区的降水事件主要是以短历时降水为主。而对降水的贡献率则以长历时降水为主。

3) 西部山区各个降水等级的降水贡献率和降水发生率随降水等级的逐渐增大均呈幂指数递减的趋势，山区小雨发生频率均较高，是降水量的贡献主体。

4) 纬度与降水量有显著负相关性。即降水量变化与纬度变化呈密切负相关。

Analysis of Characteristics of Precipitation in the Western Mountainous Area in Henan Province[J]. 自然科学, 2019, 07(06): 542-548. https://doi.org/10.12677/OJNS.2019.76063

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