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OALib Journal期刊
ISSN: 2333-9721
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末次盛冰期长江南京段河槽特征及古流量
DOI: 10.11821/xb200903008, PP. 331-338
Keywords: 古河槽,流速,流量,末次盛冰期,长江南京段
Abstract:
根据南京长江大桥、三桥、四桥的地质钻孔资料，绘制南京段长江古河槽地质剖面示意图。对拟建南京长江四桥附近的四个钻孔进行了采样分析，从钻孔沉积物样品的14C年代及阶地形成时间，可以判断，南京段约-60m~-90m的深槽为末次盛冰期时的长江河槽。钻孔揭示，南京段长江古河槽狭窄陡峭，呈V型，在南京长江大桥附近形成局部深切。根据长江三桥、长江大桥附近古深槽断面形态及底部沉积物颗粒级配，选用沙莫夫公式、河海大学公式等，计算了末次盛冰期时河槽底部的泥沙起动流速及断面平均流速。根据流量—流速—过水断面之间的关系式，计算得出末次盛冰期时长江的流量约为12000~16000m3/s。
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