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引用本文:陈镇东,罗建育,林志明,陈佳奇.台湾地区湖泊水库沉积速率初步探讨.海洋与湖沼,1997,28(6):624-631.
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台湾地区湖泊水库沉积速率初步探讨
陈镇东, 罗建育, 林志明, 陈佳奇
高雄中山大学海洋地质及化学研究所 高雄 80424
摘要:
对1989-1991年期间,在台湾地区采集的5个湖泊的沉积物岩芯和22个湖泊水库的表层沉积物,进行了沉积物超量210Pb活性的分析,以探讨其沉积速率。其中,小鬼湖沉积物岩芯取部分样品进行14C定年,以与210Pb所得结果比较。结果表明,数千年来,台湾高山湖泊、次高山湖泊的沉积速率相当稳定,除万里池外,大多介于0.06-0.16 cm/a之间。火山湖的210Pb活性较一般湖泊高,这是由于火山湖当地安山岩及地下水释出较多的210Pb所致,但这并不意味其沉积速率慢。所以应用210Pb对火山湖沉积物定年时,须作特别修正。平地湖泊目前沉积速率,除了大埔水库高达6.42 cm/a外,大多介于0.5—3.2 cm/a之间,比高山湖泊的沉积速率高约10-20倍。另外,由水库淤沙资料显示,历年平均沉积速率都比目前的沉积速率快数倍,其中以石门、白河、乌山头、阿公店4个水库的平均沉积速率较快。
关键词:  210Pb  沉积速率  湖泊  水库
DOI:
分类号:
基金项目:行政院国家科学委员会资助!NSC-82-0209-M-110-041;环保署及垦丁国家公园管理处资助
附件
SEDIMENTATION RATES OF LAKES AND RESERVOIRS IN TAIWAN
Chen-lung Arthur Chen, Jiann-Yuh, Jyh-Min Lin, Chia-Chi Chen
Institute of Marine Geology and Chemismp Nalional Sun Yat-sen University Kaohsiung, Taiwan 80424
Abstract:
The 210Pb activities were measured in sediment cores from 5 lakes, and in surface sediments from 22 lakes and reservoirs in Taiwan during l989 - 199l, in order to calculate the sedimentation rates. Samples from Xiaogui Lake were also dated by 14C.

The results show that the sedimentation rates of alpine and subalpine lakes were fairly constant during the past several thousand years, mostly ranging between 0.06 and 0.16 cm/a. Lakes in the andesite area , such as Menghuan Lake and Lanyu-ten Pond, have higher 210Pb activities than those of non-volcanic ones. This is not because of the lower sedimentation rates, but is due to the extra 210Pb input from andesite and ground-water nearby. The current sedimentation rates of low-land lakes are 10 - 20 folds higher than those of alpine and subalpine lakes, ranging between 0.5 and 3.2 cm / a, except for Dapu Reservoir (6.42 cm/a).

In addition, the thickness of sediment and the deposition rate in a reservoir can be estimated from the siltation amount The average sedimentation rates of 11 reservoirs since their constructions are in the ranges of 0.18 - 22.75 cm/a, and are several times higher than the present rates (0.44 - 6.42 cm/a), with Shimen, Baihe, Wushantou and Akondain reservoirs being the highest. The 210Pb activities were measured in sediment cores from 5 lakes, and in surface sediments from 22 lakes and reservoirs in Taiwan during l989 - 199l, in order to calculate the sedimentation rates. Samples from Xiaogui Lake were also dated by 14C.

The results show that the sedimentation rates of alpine and subalpine lakes were fairly constant during the past several thousand years, mostly ranging between 0.06 and 0.16 cm/a. Lakes in the andesite area , such as Menghuan Lake and Lanyu-ten Pond, have higher 210Pb activities than those of non-volcanic ones. This is not because of the lower sedimentation rates, but is due to the extra 210Pb input from andesite and ground-water nearby. The current sedimentation rates of low-land lakes are 10 - 20 folds higher than those of alpine and subalpine lakes, ranging between 0.5 and 3.2 cm / a, except for Dapu Reservoir (6.42 cm/a).

In addition, the thickness of sediment and the deposition rate in a reservoir can be estimated from the siltation amount The average sedimentation rates of 11 reservoirs since their constructions are in the ranges of 0.18 - 22.75 cm/a, and are several times higher than the present rates (0.44 - 6.42 cm/a), with Shimen, Baihe, Wushantou and Akondain reservoirs being the highest.

Key words:  210Pb, Sedimentation rate, Lake, Reservoir
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