Tracing Flood Water Level along Nanjing Cliff Bank of the Yangtze River
Received date: 2004-06-08
Revised date: 2004-10-09
Online published: 2004-11-25
Supported by
National Natural Science Foundation of China, No. 40271004
Some remnant marks of flood water level, characterized by dark color and with small eroded holes distributed on the horizontal level marks, are found along the hillside of Nanjing. The same features of the remnant marks of flood water level are also found on the cape of Caishiji cliff of Cuiluo Mountain. Detailed analyses on the altitude of the remnant water level marks and sediment grain-size collected inside the eroded holes and on the Yangtze River floodplain are carried out and comparisons with flood historical literature and modern flood water level records are made. Based upon which the following conclusions are drawn: (1) The altitude of the first and second ancient water level marks at 8.5 m and 9.5 m which exceed the modern Yangtze River water surface by 5-6 m are considered as paleoflood remnant because they have been disengaged from present Yangtze River water surface for a long time. (2) The altitude of the third ancient water level mark is 10.5 m, which is 0.3 m higher than the catastrophic flood in 100 years recorded in history. According to historical records of the Yangtze River flood, the level this paleoflood event may be equivalent to the level of a catastrophic flood in 100-200 years. (3) The altitude of the highest ancient water level mark is 12.8 m which is probably equal to the height of the paleoflood taking place in high sea level time of the Holocene.
Key words： lower Yangtze River; Nanjing; cliff bank of limestone; flood water level
HE Huachun, WANG Ying, LI Shuheng . Tracing Flood Water Level along Nanjing Cliff Bank of the Yangtze River[J]. Acta Geographica Sinica, 2004 , 59(6) : 938 -947 . DOI: 10.11821/xb200406017
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