长江口深水航道回淤强度与潮汐动力相关性分析

发布时间：2018-08-16 15:03

【摘要】：长江口12.5 m深水航道的回淤监测资料表明,航道回淤强度大小和潮汐动力强弱存在较好的负相关关系,即大潮-中潮-小潮过程(动力减弱期),北槽实测回淤强度大;而小潮-中潮-大潮过程(动力增强期),北槽回淤强度则变小,目前的疏浚工程仅考虑大通流量的影响而忽略了外海潮汐的贡献,疏浚强度的安排明显与回淤强度不匹配。根据疏浚强度、回淤强度、潮汐动力间的相关关系来看,未来可深入研究长江口北槽深水航道潮汐动力过程和疏浚安排对回淤强度的影响,探索"疏浚-回淤"与"大通流量-外海潮汐"间的制衡关系,以及该关系对航道的宏观、微观冲淤环境的影响,这样才有利于寻找出一套较为合理的疏浚力量配置管理原则,有利于最大限度地提高疏浚效率,为长江口深水航道疏浚资源的优化配置及航道减淤提供新的思考空间。
[Abstract]:The siltation monitoring data of the 12.5 m deep water channel in the Yangtze River Estuary show that there is a good negative correlation between the siltation intensity of the channel and the tidal dynamic strength, that is, the process of the spring tide, the middle tide and the low tide (the period of dynamic weakening), and the intensity of the sediment redeposition measured in the north channel is large. However, in the process of small tide, middle tide and spring tide (dynamic enhancement period), the silt intensity of the north channel becomes smaller. The current dredging engineering only considers the influence of the Chase discharge and neglects the contribution of the offshore tide. The arrangement of the dredging intensity is obviously not matched with the siltation intensity. According to the correlation among dredging intensity, siltation intensity and tidal force, the influence of the tidal dynamic process and dredging arrangement on the desilting intensity of the North Channel of the Yangtze River Estuary can be studied in the future. This paper probes into the balance relationship between dredging and dredging, and the influence of this relationship on the macro-and micro-environment of channel erosion and siltation. Only in this way can we find out a set of reasonable management principles of dredging force allocation. It is beneficial to improve the efficiency of dredging and provide a new thinking space for optimizing the allocation of dredging resources and reducing siltation of the channel in the Yangtze Estuary.
【作者单位】：交通运输部长江口航道管理局;上海河口海岸科学研究中心河口海岸交通行业重点实验室;
【基金】：国家863计划资助项目(2012AA112508) 交通运输部基础理论重点资助项目(2012329A06040)
【分类号】：U612.2;U617.6

【参考文献】