Resources Science ›› 2016, Vol. 38 ›› Issue (6): 1192-1202.doi: 10.18402/resci.2016.06.18

• Orginal Article • Previous Articles    

Spatial-temporal variation and factors affecting precipitation in the hilly area of Taihang Mountain

TIAN Tian1,2,3, SONG Xianfang1, YANG Lihu1, ZHANG Yinghua1, BU Hongmei1   

  1. 1. Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China
    2. University of Chinese Academy of Sciences,Beijing 100049,China
    3. Sino-Danish Center for Education and Research,Beijing 100190,China
  • Received:2015-06-18 Revised:2016-04-27 Online:2016-06-20 Published:2016-06-18

Abstract:

Chongling catchment is located in the northeast of Taihang Mountains. Based on precipitation event data from six observation points from 2005 to 2014 (April to October)in the Chongling catchment,temporal(annual,monthly,daily and hourly)and spatial characteristics of precipitation and other factors were analyzed using linear regression and Mann-Kendall trend tests. A significant uneven distribution was found in temporal and spatial analysis of precipitation data. Precipitation amount from April to October in different years changed sharply without any significant increase or decrease tendency. Precipitation from June to September contributed more than 70% of the whole year. Precipitation amount under monthly time scale showed only precipitation in May had a significant decrease tendency. Precipitation days decreased with a slope of 1.22 days/year over the last 10 years. Light rain (less than 10 mm/day)is the main type of precipitation in the catchment which contributed more than 50% of total precipitation resources. However,the frequency of heavy rain significantly increased with a slope of 0.19 days/yr which certified a potential threat of extreme precipitation still exists. For spatial analysis of precipitation,the observation points on downstream have more precipitation amounts than points on upstream. Combined with the method of control variable,it can be concluded that vegetation cover played an important role in rainfall distribution in the Chongling catchment and hilly area of Taihang Mountains. Pine, Arborvitae and Acacia can significantly increase reginal precipitation amount.

Key words: precipitation, temporal and spatial distribution, hilly area of Taihang Mountains, influencing factor, Chongling catchment