Characteristics and runoff volume of the Yangtze River paleo-valley at Nanjing reach in the Last Glacial Maximum
Characteristics and runoff volume of the Yangtze River paleo-valley at Nanjing reach in the Last Glacial Maximum
复制标题
末次盛冰期长江南京段古河谷特征及径流量
DOI：
10.1007/s11442-010-0431-3
复制
发表时间：
2010-04
影响因子：
4.9
通讯作者：
中科院分区：
文献类型：
--
作者：
建立了南京长江一号桥、三号桥、四号桥附近的长江切谷地层剖面图，并附有钻孔数据和资料。通过对四号桥（待建）附近4个岩心样品的14C年龄分析，可以发现古河谷的时代范围为南京附近-60 m至-90 m深度的末次盛冰期。也表明深切谷河道狭窄，水流湍急。长江古深水航道在一桥附近呈现出局部深切的特征。据以往文献报道，人们对长江主要古河道进行了大量的研究，但在流量估算方面却鲜有成果。本文计算末次重力机的初速度和平均速度为 $$ V_c = 4.60d^{{1 \mathord{\left/ {\vphantom {1 3}} \right。 \kern-\nulldelimiterspace} 3}} h^{{1 \mathord{\left/ {\vphantom {1 6}} \right。 \kern-\nulldelimiterspace} 6}} ,V_c = 1.281g\left( {13.15.\frac{h} {{d_{95} }}} \right)\sqrt {gd} ,V \approx 6.5u_* \left| {\frac{h} {{d_{90} }}} \right|^{\tfrac{1} {6}} $$等，从三号桥和一号桥附近的河流形状、沉积粒度和层序等方面来看。此外，根据流量、流速和断面关系，预计末次盛冰期长江南京河段的流量约为12000~16000 m3/s。
The stratigraphical cross-sections of the Yangtze River incised-valley near the No.1, No.3 and No.4 Nanjing Yangtze River bridges were established with respective bore date and documents. By14C age analysis of the samples of four drilling cores near the No.4 Bridge (to be built), we can find that the time range of paleo-valley is dated in the LGM at a depth of −60 m to −90 m near Nanjing. It is also indicated that the deep incised-valley channel was narrow and the river flowed swiftly. The ancient Yangtze River deep channel presented partially and deeply incised features near the No.1 Bridge. According to previous publications, much research has been done on the main paleo-channel of the Yangtze River, but few results have been achieved on discharge estimation. In this paper, the incipient velocity and average velocity of the LGM was calculated with $$ V_c = 4.60d^{{1 \mathord{\left/ {\vphantom {1 3}} \right. \kern-\nulldelimiterspace} 3}} h^{{1 \mathord{\left/ {\vphantom {1 6}} \right. \kern-\nulldelimiterspace} 6}} ,V_c = 1.281g\left( {13.15.\frac{h} {{d_{95} }}} \right)\sqrt {gd} ,V \approx 6.5u_* \left| {\frac{h} {{d_{90} }}} \right|^{\tfrac{1} {6}} $$, etc., in terms of the river shape, sedimentary grain size and sequences near the No.3 and No.1 bridges. Moreover, the discharge in Nanjing reach of the Yangtze River during the LGM has been estimated to be around 12,000–16,000 m3/s according to the relationship of discharge, velocity of flow and cross-section.
登录
查看更多内容
DOI：
10.1016/0031-0182(90)90115-n
发表时间：
1990
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
J. Maizels
通讯作者：
J. Maizels
DOI：
10.1016/0031-0182(90)90062-c
发表时间：
1990-12
期刊：
IEEE Trans. Signal Process.
影响因子：
--
作者：
K. Lambeck
通讯作者：
K. Lambeck
影响因子：
2.2
作者：
A. Sidorchuk;O. Borisova
通讯作者：
A. Sidorchuk;O. Borisova
DOI：
--
发表时间：
2006
期刊：
Journal of Henan University
影响因子：
--
作者：
C. Guang-jie;W. Jian;QU Gui-xian
通讯作者：
C. Guang-jie;W. Jian;QU Gui-xian
DOI：
--
发表时间：
2008
期刊：
--
影响因子：
--
作者：
Liu Yu;He Jinhai
通讯作者：
Liu Yu;He Jinhai