|
|||||
|
|
| Application of ~(137)Cs fingerprinting technique to interpreting sediment production records from reservoir deposits in a small catchment of the Hilly Loess Plateau, China | |
| 作者单位： | ZHANG XinBao1，2?，WEN ZhongMing3，FENG MingYi4，YANG QinKe3 & ZHENG JinJun1 1 Institute of Mountain Hazards and Environment，Chinese Academy of Sciences (CAS) & Ministry of Water Resources (MWR)，Chengdu 610041，China; 2 State Key laboratory of Loess and Quaternary Geology，Institute of Earth Environment，CAS，Xi’an 710075，China; 3 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau，Institute of Soil and Water Conservation，CAS & MWR，Yangling 712100，China; 4 China West Normal University，Nanchong 637002，China |
| 基金项目： | Supported by CAS (Grant No. KZCX3-SW 422)，NNSF (Grant Nos. 90502002, 40271015)，ISWC (B105101-109) and IAEA (12322/RO) |
| 摘 要： | According to variations of 137Cs and clay contents, 44 flood couplets were identified in a profile of res- ervoir deposit with a vertical length of 28.12 m in the Yuntaishan Gully. Couplet 27 at the middle of the profile had the highest average 137Cs content of 12.65 Bq·kg?1, which indicated the 1963s' deposits, then 137Cs content decreased both downward and upward in the profile. The second top and bottom couplets had average 137Cs contents of 2.15 Bq·kg?1 and 0.92 Bq·kg?1, respectively. By integrated analysis of reservoir construction and management history, variations of 137Cs 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 2.36×104 m3 occurred 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 1.29×104 t·km?2·a?1 for the Yuntaishan Gully during the period of 1960-1970, which was slightly higher than 1.11 ×104 t·km?2·a?1 for the Upper Yanhe River Basin above the Ganguyi Hydrological Station and slightly lower than 1.40 ×104 t·km?2·a?1 for 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. |
Application of ~(137)Cs fingerprinting technique to interpreting sediment production records from reservoir deposits in a small catchment of the Hilly Loess Plateau, China |
|
| Authors: | ZHANG XinBao WEN ZhongMing FENG MingYi YANG QinKe ZHENG JinJun |
| Institution: | 1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences (CAS) & Ministry of Water Resources (MWR), Chengdu 610041, China;State Key laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi'an 710075, China 2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & MWR, Yangling 712100, China 3. China West Normal University, Nanchong 637002, China 4. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences (CAS) & Ministry of Water Resources (MWR), Chengdu 610041, China |
| Abstract: | According to variations of 137Cs 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 average 137Cs content of 12.65 Bq+kg-1, which indicated the 1963s' deposits, then 137Cs content decreased both downward and upward in the profile. The second top and bottom couplets had average 137Cs contents of 2.15 Bq+kg-1 and 0.92 Bq+kg-1, respectively. By integrated analysis of reservoir construction and management history, variations of 137Cs 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 2.36×104 m3 occurred 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 1.29×104 t+km-2+a-1 for the Yuntaishan Gully during the period of 1960-1970, which was slightly higher than 1.11 ×104 t+km-2+a-1 for the Upper Yanhe River Basin above the Ganguyi Hydrological Station and slightly lower than 1.40 ×104 t+km-2+a-1 for 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. |
| Keywords: | Hilly Loess Plateau small catchment reservoir deposit 137Cs fingerprinting technique sediment yield |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |