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[1]GUO Xiao-jun,SU Feng-huan,HONG Yong,et al.Characteristics of Hydrogen and Oxygen Isotopes in Rainy Season Precipitation in Jiangjiagou Watershed[J].Research of Soil and Water Conservation,2012,19(02):82-85,90.

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Characteristics of Hydrogen and Oxygen Isotopes in Rainy Season Precipitation in Jiangjiagou Watershed

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 19 Number of periods: 2012 02 Page number: 82-85,90 Column: Public date: 2012-04-20

Title:: Characteristics of Hydrogen and Oxygen Isotopes in Rainy Season Precipitation in Jiangjiagou Watershed

Author(s):: GUO Xiao-jun¹, SU Feng-huan¹, HONG Yong¹, ZOU Qiang¹; 1. Key Laboratory of Mountain Hazards and Land Surface Progress, Institute of Mountain Hazards and Environment, CAS, Chengdu 610041, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:: precipitation; hydrogen and oxygen isotopes; meteoric water line; deuterium excess; underground water; Jiangjiagou wagershed

CLC:: P426.6;P641.3

DOI:: -

Abstract:: The rainfall events occurred from 2001 to 2009 in Jiangjiaou watershed was analyzed.The rainfall frequency and cumulative frequency of rainfall before triggering of a debris flow can be fitted by power exponent distribution and logarithmic distribution,respectively.This result shows that the triggering of debris by rainfall is a random phenomenon,and subjects a random distribution.The isotopic compositions of precipitation over the Jiangjiagou watershed in the summer of 2010 are studied.Local meteoric water line is fitted as δD=7.1086δ¹⁸O-14.22.Its intercept is lower than that of Chinese meteoric water line which is related to the geographical and meteorological characteristics in this area.With the change of air humidity,the values of deuterium excess are positive before mid-July,and are much lower during mid-July and mid-August,then increase again after the mid-August.The δ¹⁸O value in an individual rainfall is lower as the rainfall increases.By the effort of the randomness of the mountain area precipitation,the stable isotopic concentration is higher as the attitude rises.

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