| 借助137Cs估算滇池沉积量 |
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| 引用本文： | 张燕,高翔,钟振宇,陈捷,彭补拙.借助137Cs估算滇池沉积量[J].地理学报(英文版),2009,19(2). |
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| 作者姓名： | 张燕 高翔 钟振宇 陈捷 彭补拙 |
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| 作者单位： | |
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| 基金项目： | 国家自然科学基金，The Key Project of the State Key Laboratory of Soil Sustainable Agriculture |
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| 摘 要： |
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| 关 键 词： | 137Cs 泥沙淤积 滇池 平均沉积速率 昆明准静止锋 富营养化 污染负荷 垂直分布 |
Sediment accumulation of Dianchi Lake determined by 137Cs dating |
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| ZHANG Yan,GAO Xiang,ZHONG Zhenyu,CHEN Jie,PENG Buzhuo.Sediment accumulation of Dianchi Lake determined by 137Cs dating[J].Journal of Geographical Sciences,2009,19(2). |
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| Authors: | ZHANG Yan GAO Xiang ZHONG Zhenyu CHEN Jie PENG Buzhuo |
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| Institution: | [1]School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China [2]State Key Laboratory of Soil Sustainable Agriculture, Nanjing Institute of Soil Sciences, CAS, Nanjing 210008, China |
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| Abstract: | The water quality of Dianchi Lake declines quickly and the eutrophication is getting serious. To identify the internal pollution load of Dianchi Lake it is necessary to evaluate its sediment accumulation. Sedimentation rates of Dianchi Lake are determined by 137Cs dating. However, 137Cs vertical distribution in sediment cores of Dianchi Lake has special character-istics because Dianchi Lake is located on the southeast of the Qinghai-Tibet Plateau, the Kunming quasi-stationary front is over the borders of Yunnan and Guizhou where the specific precipitation is distributed. Besides 1954, 1963 and 1986 137Cs marks can be determined in sediment cores, a 137Cs mark of 1976 representing the major period of 137Cs released from China unclear test can be determined and used for an auxiliary dating mark. Meanwhile Di-anchi Lake is divided into seven sections based on the water depth, basin topography, hy-drological features and supplies of silt and the lakebed area of each section is calculated. The mean annual sedimentation rates for seven sections are 0.0810, 0.1352, 0.1457, 0.1333, 0.0904, 0.1267 and 0.1023 g/cm2 a in 1963-2003, respectively. The gross sediment accu-mulation of the lake is 26.18×104 t/a in recent 17 years and 39.86×104 t/a in recent 50 years. |
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| Keywords: | 137Cs dating sediment accumulation rate sedimentation section Dianchi Lake |
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