沉积学报2012，Vol.30Issue(6)：1099-1105,7.
太湖沉积对流域极端降水和洪水响应的研究
Study on Lacustrine Sediments Responsing to Climatic Precipitation and Flood Discharge in Lake Taihu Catchment, China
摘要
Abstract
It is necessary to know long-term flood records and the sequence for understanding the features and periods of extreme flood, while lacustrine sediments from Taihu Lake has provided the records much longer than the observa- tions. This paper has reconstructed historical flood events during the past 150 years in Taihu Lake catchment, by sedi- mentary records from TXS core in the centre of the open water. Dating of the 210Pb and 137Cs and characteristics of the grain size and magnetic susceptibility were analyzed, and sedimentary flood index were configureated which have been correlated with regional summer precipitation and flood discharge in the lower reaches of the Yangtze River. Results showed that there were about 24 events of the extreme large floods when we used cutoff the 90'h pereentiges for the dis- charge (Q≥90th%) and summer precipitation (Pjja ≥90th% ) from historical documents since 1840AD. Compari- ably, flood index from grain size of sedimentary sand ( 〉 64 μm) and low-frequency magnetic susceptibility can catch 15 flood events during the past 150 years, 62.5% corespending with the historical records. This result supported that lacustrine sediment records can well reconstruct the paleoflood change, and provid scientific basis of sedimentology and magnetic susceptibility to recognize centenary timescale extreme floods in features and periods.关键词
太湖/湖泊沉积/粒度/磁化率/洪水指标Key words
Taihu Lake/lake sediments/grain size/magnetic susceptibility/flood index分类
天文与地球科学引用本文复制引用
李永飞,于革,沈华东,胡守云,姚书春,尹刚..太湖沉积对流域极端降水和洪水响应的研究[J].沉积学报,2012,30(6):1099-1105,7.基金项目
科技部全球变化重大科学研究计划（2012CB956103）、中国科学院重要方向项目（KZCX2-YW-338-2）和中国科学院对外合作重点项目（GJHZ1214）资助. （）
