新型箱式采泥器研制 及在长江口航道回淤研究中的应用

为获取河床沉积物原状样品,研制一种新型箱式采泥器,并在长江口12.5 m深水航道回淤研究中开展应用.结果表明:新型箱式采泥器密封性好、适应性强、成功率高、样品量多且保持原状.新型箱式采泥器采集的原状样品揭示出长江口南港北槽河床沉积物包括沙、泥、沙泥混合、沙泥分层4类,沉积物类型及变化特征反映了泥沙来源和沉积过程.基于沉...

Development of new bottom sampler and its application in study of back-siltation in the Yangtze estuary channel

In order to sample undisturbed riverbed sediments,a new type of bottom sampler is developed and applied to the study of back-siltation in the Yangtze estuary 12.5 m deep-water channel.The results show that the new bottom sampler has advantages in tightness,adaptability,success rate of sampling,quantity,and fidelity of sediment sample.The undisturbed sediment in the south channel(SC)and north passage(NP)includes sand,mud,mixed sand-mud,and layered sand-mud,and the types and variation characteristics of sediments reflect the sediment source and deposition process.Based on the grain size parameters of undisturbed sediment samples,the bedload transport trend in SC and the quantitative influence of bedload on back-siltation in the Yangtze estuary deep-water channel are studied.