IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Gao Jinzhang1; Long Yi1; Zhang Xinbao1; Collins Adrian L2; He Xiubin1; Zhang Yunqi3; Shi Zhonglin1
Source Publicationjournalofmountainscience
AbstractReservoir sedimentation dynamics were interpreted using Cs-137 activity, particle size and rainfall erosivity analysis in conjunction with sediment profile coring. Two sediment cores were retrieved from the Changshou reservoir of Chongqing, which was dammed in 1956 at the outlet of Longxi catchment in the Three Gorges Area using a gravity corer equipped with an acrylic tube with an inner diameter of 6 cm. The extracted cores were sectioned at 2 cm intervals. All sediment core samples were dried, sieved (<2 mm) and weighed. ~(137)Cs activity was measured by γ-ray spectrometry. The particle size of the core samples was measured using laser particle size granulometry. Rainfall erosivity was calculated using daily rainfall data from meteorological records and information on soil conservation history was collated to help interpret temporal sedimentation trends. The peak fallout of ~(137)Cs in 1963 appeared at a depth of 84 cm in core A and 56 cm in core B. The peaks of sand contents were related to the peaks of rainfall erosivity which were recorded in 1982, 1989, 1998 and 2005, respectively. Sedimentation rates were calculated according to the sediment profile chronological controls of 1956, 1963, 1982, 1989, 1998 and 2005. The highest sedimentation rate was around 2.0 cm?a~(-1) between 1982 and 1988 when the Chinese national reform and the Household Responsibility System were implemented, leading to accelerated soil erosion in the Longxi catchment. Since 1990s, and particularly since 2005, sedimentation rates clearly decreased, since a number of soil conservation programs have been carried out in the catchment. The combined use of ~(137)Cs chronology, particle size and rainfall erosivity provided a simple basis for reconstructing reservoir sedimentation dynamics in the context of both physical processes and soil restoration. Its advantages include avoiding the need for full blown sediment yield reconstruction and the concomitant consideration of core correlation and corrections for autochthonous inputs and reservoir trap efficiency.
Document Type期刊论文
2.Sustainable Soils and Grassland Systems Department, Rothamsted Research, North Wyke
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Gao Jinzhang,Long Yi,Zhang Xinbao,et al. interpretingsedimentationdynamicsatlongxicatchmentinthethreegorgesareachinausingcs137activityparticlesizeandrainfallerosivity[J]. journalofmountainscience,2016,13(5):857.
APA Gao Jinzhang.,Long Yi.,Zhang Xinbao.,Collins Adrian L.,He Xiubin.,...&Shi Zhonglin.(2016).interpretingsedimentationdynamicsatlongxicatchmentinthethreegorgesareachinausingcs137activityparticlesizeandrainfallerosivity.journalofmountainscience,13(5),857.
MLA Gao Jinzhang,et al."interpretingsedimentationdynamicsatlongxicatchmentinthethreegorgesareachinausingcs137activityparticlesizeandrainfallerosivity".journalofmountainscience 13.5(2016):857.
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