Application of 137Cs fingerprinting technique to interpreting sediment production records from reservoir deposits in a small catchment of the Hilly Loess Plateau, China
Application of 137Cs fingerprinting technique to interpreting sediment production records from reservoir deposits in a small catchment of the Hilly Loess Plateau, China
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DOI：
10.1007/s11430-007-2013-5
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发表时间：
2007-02
影响因子：
5.7
通讯作者：
Z. Xinbao;Weng ZhongMing;Feng Ming-yi;Y. Qinke;Zhang Jinjun
中科院分区：
文献类型：
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作者：
Z. Xinbao;Weng ZhongMing;Feng Ming-yi;Y. Qinke;Zhang Jinjun
根据137cs和粘土含量的变化，在云台山沟垂直长度为28.12 m的储层剖面中确定了44个洪水联。剖面中部的对27平均137cs含量最高，为12.65 Bq·kg−1，表明为1963年的沉积，然后剖面中137cs含量呈上下下降趋势。顶部和底部第二对的137cs平均含量分别为2.15 Bq·kg - 1和0.92 Bq·kg - 1。通过综合分析水库建设和管理历史、137cs含量在剖面上的变化、洪水联的产沙量和1958-1970年的降雨资料，确定了与洪水联有关的个别风暴。1960—1970年共发生44次洪水，总产沙量2.36×104m3occurred，年洪水事件数变化在1 ~ 10倍之间。1961-1964年秋季非常湿润的丰水期发生7-10次洪涝事件，而1965-1969年干旱期仅发生1-2次洪涝事件。1960—1970年云台山沟年平均比产沙量为1.29×104t·km−2·a−1，略高于甘谷驿水文站以上延河上游流域的1.11×104t·km−2·a−1，略低于其附近的枝方沟的1.40×104t·km−2·a−1。云台山沟的年比产沙量与雨季降雨量有较好的相关性。
According to variations of137Cs and clay contents, 44 flood couplets were identified in a profile of reservoir deposit with a vertical length of 28.12 m in the Yuntaishan Gully. Couplet 27 at the middle of the profile had the highest average137Cs content of 12.65 Bq·kg−1, which indicated the 1963s’ deposits, then137Cs content decreased both downward and upward in the profile. The second top and bottom couplets had average137Cs contents of 2.15 Bq·kg−1and 0.92 Bq·kg−1, respectively. By integrated analysis of reservoir construction and management history, variations of137Cs contents over the profile, sediment yields of flood couplets and rainfall data during the period of 1958–1970, individual storms related to the flood couplets were identified. 44 floods with a total sediment yield of 2.36×104m3occurred and flood events in a year varied between 1 and 10 times during the period of 1960–1970. 7–10 flood events occurred during the wet period of 1961–1964 with very wet autumn, while only 1–2 events during the dry period of 1965–1969. Average annual specific sediment yield was 1.29×104t·km−2·a−1for the Yuntaishan Gully during the period of 1960–1970, which was slightly higher than 1.11×104t·km−2·a−1for the Upper Yanhe River Basin above the Ganguyi Hydrological Station and slightly lower than 1.40×104t·km−2·a−1for the nearby Zhifang Gully during the same period. Annual specific sediment yields for the Yuntaishan Gully were correlated to the wet season’s rainfalls well.