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[1]ZHANG Along,GAO Ruizhong,LIU Tingxi,et al.Study on Precipitation and Runoff at Different Time Scales in Semi-Arid Grassland Basin over the Past 50 Years[J].Research of Soil and Water Conservation,2019,26(04):80-86,95.

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Study on Precipitation and Runoff at Different Time Scales in Semi-Arid Grassland Basin over the Past 50 Years

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 04 Page number: 80-86,95 Column: Public date: 2019-06-11

Title:: Study on Precipitation and Runoff at Different Time Scales in Semi-Arid Grassland Basin over the Past 50 Years

Author(s):: ZHANG Along, GAO Ruizhong, LIU Tingxi, QIN Ziyuan; College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China

Keywords:: runoff; precipitation; climate change; Xilin River basin

CLC:: P426.6;P333

DOI:: -

Abstract:: The Xilin River basin in Inner Mongolia steppe area was selected as the study area. Based on the daily data of air temperature, relative humidity, rainfall, wind speed, sunshine time, evaporation, and runoff from 1963 to 2015, the maximums, minimums and averages before and after the abrupt points and the stagnation characteristics after this time point were analyzed by using the statistical method, the M-K inspection method, and the Spearman method. The results showed that: (1) the maxima of precipitation and runoff aroused in different months, the maximum precipitation occurred in July and maximum runoff occurred in April; the number of precipitation day was much less than that of runoff day. The days of precipitation were more than those of the runoff; the amount of precipitation in wet seasons was 3 times of that in the dry season, but the volume of runoff in dry season was 2 times of that in the wet season; (2) the runoff presented the significant decreasing trend over the past years, while the trend of precipitation change was not significant; the precipitation pattern changed from abundance to scarcity between 1998 and 2011, while it changed from scarcity to abundance after 2011; (3) the abrupt year, wet season and dry season of runoff occurred in 2004, the abrupt change of runoff days in a year and dry season occurred in 2007 and 2004, and the change of runoff days in wet season was not found during the period; (4) the number of runoff days in the dry season was majority proportion in whole year; there were the same abrupt years of annual runoff and runoff in wet season and dry season, and their driving factors were similar; (5) the orders of meteorological factors influencing the precipitation followed the sequence: sunshine time, relative humidity, average wind speed, average temperature, precipitation and evaporation; The orders influencing the runoff followed the sequence: evaporation, relative humidity, average wind speed, average temperature, precipitation and sunshine time.

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