Characteristics of hydrogen and oxygen isotopes in precipitation and runoff and flood hydrograph separation in an urbanized catchment
XIE Linhuan1, JIANG Tao,1, CAO Yingjie2,3, ZHANG Desheng1, LI Kun1, TANG Changyuan1,2,3 1. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China 2. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China 3. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China
National Natural Science Foundation of China.41501512 National Natural Science Foundation of China.41471020 Natural Science Foundation of Guangdong Province, China.2017A030313231 Science and Technology Program of Guangzhou, China.201510010300
作者简介 About authors 谢林环(1993-),女,广东汕头人,硕士,主要从事水文与水环境方向研究E-mail:xielh8@mail2.sysu.edu.cn。
Abstract In order to study the response characteristics of precipitation-runoff under the influence of human activities, this paper took Shima River, a typical urbanized catchment in the Pearl River Delta as the research area. Daily samples of precipitation and river water were collected from January to December and hourly samples were collected during three typhoon rainstorms in 2017. Based on the stable isotope data (δD, δ 18O), the characteristics of hydrogen and oxygen isotopes were analyzed. Two-component isotope-based hydrograph separation was used to study the contribution of pre-event water and event water to the runoff process during three typhoon events. The results showed that δD and δ 18O in precipitation ranged from -105.10‰ to 9.98‰ and -14.80‰ to -0.55‰, respectively, and the annual weighted mean values were -57.88‰ and -8.61‰. The Local Meteoric Water Line was δD=7.70δ 18O+8.61(R 2=0.98). δD and δ 18O in river water ranged from -91.23‰ to -15.96‰ and -12.66‰ to -4.01‰, respectively. δD-δ 18O basically fell on the LMWL indicated that precipitation was the main source of runoff in the Shima River catchment. During the three typhoons, the proportion of event water was 59.7%, 55.0% and 69.4%, respectively, which was higher than that of pre-event water. In the early stage of flood, pre-event water and event water increased synchronously. In the late stage of flood, the proportion of event water increased gradually which was more than 80% during the peak period. This indicated that the increase of impervious areas in the urban regions would significantly alter the hydrological cycle. The results of this study could provide the theoretical foundations for hydrological forecast of urbanized basins in Pearl River Delta. Keywords:hydrogen and oxygen isotopes;two-component mixing model;hydrograph separation;urbanization;Shima River catchment
PDF (2577KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 谢林环, 江涛, 曹英杰, 张得胜, 黎坤, 唐常源. 城镇化流域降水径流氢氧同位素特征及洪水径流分割. 地理学报[J], 2019, 74(9): 1733-1744 doi:10.11821/dlxb201909003 XIE Linhuan. Characteristics of hydrogen and oxygen isotopes in precipitation and runoff and flood hydrograph separation in an urbanized catchment. Acta Geographica Sinice[J], 2019, 74(9): 1733-1744 doi:10.11821/dlxb201909003
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