双导堤工程下潮汐汊道与海岸潟湖地貌稳定性  

Geomorphological Stabilities of Tidal Inlet and Coastal Lagoon Under Influence of a Double-guide-dike Project

作　　者：匡翠萍[1] 范家栋 董智超 韩雪健 KUANG Cuiping;FAN Jiadong;DONG Zhichao;HAN Xuejian(College of Civil Engineering,Tongji University,Shanghai200092,China;CCCC First Harbor Engineering Co.Ltd.,Tianjin 300461,China;Tianjin Port Engineering Institute Co.,Ltd.of CCCC First Harbor Engineering Co.Ltd.,Tianjin 300222,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]中交第一航务工程局有限公司,天津300461 [3]中交天津港湾工程研究院有限公司,天津300222

出　　处：《同济大学学报（自然科学版）》2023年第10期1584-1594,共11页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(41976159)。

摘　　要：以渤海湾沿岸具有双导堤工程的单一潮汐汊道的华北最大海岸潟湖—七里海潟湖为原型建立理想模型,通过设置包括临界侵蚀应力、临界淤积应力、泥沙沉速、初始床面高程和径流量等影响潟湖地貌演变的相关参数,得到理想模型达到稳定状态后的纳潮量P和潮汐汊道断面最大流量Q_(m)。分别建立其与潮汐汊道断面面积A的相关关系式以表征潮汐汊道稳定性。比较分析发现在表征潮汐汊道稳定性方面,Q_(m)‒A关系较P‒A关系的拟合效果更佳。分别利用Q_(m)‒A关系以及泥沙净冲淤量计算得到潮汐汊道和潟湖稳定所需时长,对比结果表明潟湖明显滞后于潮汐汊道达到稳定状态,临界侵蚀应力对潮汐汊道稳定性影响更大,而临界淤积应力、泥沙沉速和初始床面高程对潟湖稳定性影响尤为显著,径流量对潟湖和潮汐汊道稳定性的影响相当。To investigate the stability of a coastal lagoon system with a single tidal inlet under the influence of a double-guide-dike project,an ideal model was established based on the largest costal lagoon with a single tidal inlet in North China,Qilihai Lagoon.Scenarios were set with different variables,including critical erosion shear stress,critical deposition shear stress,sediment settling velocity,initial bed elevation and runoff.The tidal prism P,the maximum discharge Q_(m),and the cross-section area A of the tidal inlet were collected when the ideal model attains the equilibrium state in each case,and then equations about Q_(m)-A relationship and P-A relationship are established to indicate the stability of the tidal inlet.It illustrates that the Q_(m)-A relationship is more effective than the P-A relationship to show the stability of the tidal inlet.Then,both Q_(m)-A relationship and net erosion or deposition amount are utilized to calculate the time costs for the tidal inlet and the lagoon to attain the equilibrium state in each case.It indicates that the lagoon costs more time to attain the stability than the tidal inlet;critical erosion shear stress causes more effect on the tidal inlet;the lagoon is more sensitive to critical deposition shear stress,sediment settling velocity and initial bed elevation;runoff brings about the similar influence on the stability of the lagoon and the tidal inlet.

关 键 词：海岸潟湖 潮汐汊道 地貌稳定性 Q_(m)-A关系 P-A关系 平衡状态 

分 类 号：P75[天文地球—海洋科学]