崇明东滩鸟类栖息地优化工程区海堤水闸外侧引水渠冲淤数值模拟

doi:10.3969/j.issn.1000-5641.201941013

摘要/Abstract

摘要： 在河口水动力模式的基础上，耦合泥沙模块和底部冲淤方程，建立了崇明东滩鸟类保护区海堤外侧引水渠冲淤三维数值模式. 模式上游闸门水通量由堰流公式计算，内侧水位由随塘河水动力模式计算，模式下游水位、盐度、泥沙浓度由长江河口大区域数值模式计算. 利用2018年7月28—30日优化工程区水闸开闸冲淤前后实测引水渠底部高程进行验证，模式计算的高程与实测值吻合良好，表明模式能较好地模拟引水渠冲淤变化. 冲淤计算结果表明，闸下引水渠在自然状态下，涵闸关闭60 d后基本淤平，闸口淤积量最大，淤积程度自闸口向外海逐渐减小. 引水渠自然淤积2个月后，随塘河蓄水至3.0 m开闸放水，引水渠平均冲淤量为96 mm；随塘河蓄水至3.8 m开闸放水，引水渠平均冲淤量为133 mm；纳潮冲淤一天，引水渠平均冲淤量为625 mm. 纳潮冲淤是最为有效的冲淤方式. 研究成果可为崇明东滩国家级自然保护区生态修复工程区的保护与管理、引水渠冲淤方案提供科技指导.

关键词: 崇明东滩, 候鸟保护区, 闸下淤积, 引水渠冲淤, 数值模拟

Abstract: A three-dimensional numerical model for erosion and deposition at the water intake channel of the outer seawall of Chongming Dongtan Bird Sanctuary was established based on the hydrodynamic model of the estuary coupled with the sediment module and the bottom erosion and sedimentation equation. The model’s upstream boundary condition at the sluice was specified with water flux calculated by the Weir formula, where the inner water level was calculated by the hydrodynamic model of the Suitang River. The model’s downstream boundary condition of the water level, salinity and sediment concentration were calculated by the large domain numerical model of the Changjiang Estuary. We measured bottom elevations at the water intake channel before and after the sluice opening from July 28 to July 30, 2018 and found that the calculated model elevations were in general agreement with the measured values, indicating that the model can accurately simulate erosion and sedimentation changes. The calculation results for scouring and siltation show that under natural conditions, the water intake channel becomes level after 60 days of sluice closure because of sediment deposit. Siltation is largest near the sluice and gradually decreases with distance from the sluice to the sea. After the water intake channel was naturally silted for two months, the mean erosion thickness at the water intake channel was 96 mm in the case where Suitang River accumulated up to 3.0 m of water and discharged thereafter, 133 mm in the case where Suitang River accumulated up to 3.8 m of water and discharged thereafter, and 625 mm in the case where Suitang River accumulated up to 3.0 m of water and the sluice was opened to receive tidal water. Leaving the sluice open to receive tidal water is the most effective way for scouring sediment in the water intake channel. The research results provide scientific and technical guidance for the protection and management of the ecological restoration project area in Chongming Dongtan National Nature Reserve and the scouring sediment scheme of the water intake channel.

Key words: Chongming Dongtan, birds nature reserve, deposit downstream sluice, scouring sediment of the water intake channel, numerical simulation

中图分类号:

P731.23

鲁佩仪, 朱建荣, 钱伟伟, 袁琳. 崇明东滩鸟类栖息地优化工程区海堤水闸外侧引水渠冲淤数值模拟[J]. 华东师范大学学报（自然科学版）, 2020, 2020(3): 43-54.

LU Peiyi, ZHU Jianrong, QIAN Weiwei, YUAN Lin. Numerical simulation of erosion and deposition at the water intake channel of the outer seawall sluice in the ecological restoration project area of Chongming Dongtan Bird Habitat[J]. Journal of East China Normal University(Natural Science), 2020, 2020(3): 43-54.

参考文献

[1] 杨元平, 唐子文, 史英标. 曹娥江大闸闸下淤积现状分析及减淤对策初探[J]. 浙江水利科技, 2013(2): 35-39. DOI: 10.3969/j.issn.1008-701X.2013.02.008
[2] 金元欢, 沈焕庭. 我国建闸河口冲淤特性[J]. 泥沙研究, 1991(4): 59-68
[3] 李大山, 任汝述. 波浪作用下异重流运动特性研究[J]. 海洋工程, 1996(4): 54-59
[4] 窦国仁. 窦国仁论文集[M]. 北京: 中国水利水电出版社, 2003.
[5] 伍冬领, 林炳尧, 余大进, 等. 永宁江枢纽引航道和挡潮闸闸港冲淤研究[J]. 泥沙研究, 2003(2): 69-72. DOI: 10.3321/j.issn:0468-155X.2003.02.012
[6] 曲红岭, 窦希萍, 赵晓冬, 等. 不同类型建闸河口闸下淤积模拟计算[J]. 海洋工程, 2011, 29(2): 59-67. DOI: 10.3969/j.issn.1005-9865.2011.02.009
[7] 成建, 刘德荣. 浅析闸下港道淤积及治理问题[J]. 山东水利, 2011(7): 24-26. DOI: 10.3969/j.issn.1009-6159.2011.07.011
[8] 徐雪松, 窦希萍, 陈星, 等. 建闸河口闸下淤积问题研究综述[J]. 水运工程, 2012(1): 116-121. DOI: 10.3969/j.issn.1002-4972.2012.01.024
[9] 王文杰. 海泊河挡潮闸泥沙模型试验研究[D]. 山东青岛: 中国海洋大学, 2012.
[10] 朱明成. 江苏淤涨型海岸闸下淤积问题初探[J]. 江苏水利, 2014(6): 11-12
[11] 钱建平, 严琴琴, 夏栩. 小洋口闸下港槽淤积分析[J]. 中国水运, 2014, 14(11): 307-309
[12] 陈其美. 新洋港闸下港道淤积分析及对策[J]. 水利建设与管理, 2009, 29(9): 57-59. DOI: 10.3969/j.issn.1005-4774.2009.09.024
[13] 孙振华, 虞快. 崇明东滩鸟类自然保护区的建立及其意义[J]. 上海建设科技, 1998(4): 24-26
[14] 孙鸿雁, 唐芳林, 周红斌, 等. 上海崇明东滩鸟类国家级自然保护区总体规划的启示[J]. 林业建设, 2013(1): 22-26
[15] BLUMBERG A F, MELLOR G L. A description of a three-dimensional coastal ocean circulation model[G]//HEAPS N S. Three-Dimensional Coastal Ocean Models. Washington, DC: American Geophysical Union, 1987: 1-16.
[16] QIU C, ZHU J R. Influence of seasonal runoff regulation by the Three Gorges Reservoir on saltwater intrusion in the Changjiang River Estuary[J]. Continental Shelf Research, 2013, 71: 16-26. DOI: 10.1016/j.csr.2013.09.024.
[17] LYU H H, ZHU J R. Impact of the bottom drag coefficient on saltwater intrusion in the extremely shallow estuary[J]. Journal of Hydrology, 2018, 557: 838-850. DOI: 10.1016/j.jhydrol.2018.01.010.
[18] LI L, ZHU J R, WU H. Impacts of wind stress on saltwater intrusion in the Yangtz Estuary[J]. Science China Earth Sciences, 2012, 55(7): 1179-1192.
[19] LI L, ZHU J R, WU H, et al. A numerical study on the water diversion ratio of the Changjiang Estuary during the dry season[J]. Chinese Journal of Oceanology and Limnology, 2010, 28(3): 700-712. DOI: 10.1007/s00343-010-9114-2.
[20] 朱建荣, 吴辉, 顾玉亮. 长江河口北支倒灌盐通量数值分析[J]. 海洋学研究, 2011, 29(3): 1-7. DOI: 10.3969/j.issn.1001-909X.2011.03.002
[21] QIU C, ZHU J R. Assessing the influence of sea level rise on salt transport processes and estuarine circulation in the Changjiang River Estuary[J]. Journal of Coastal Research, 2015, 31(3): 661-670.
[22] 刘高峰. 长江口水沙运动及三维泥沙模型研究[D]. 上海: 华东师范大学, 2011.
[23] 曹祖德, 王运洪. 水动力泥沙数值模拟[M]. 天津: 天津大学出版社, 1994: 241-249.
[24] 罗志发. 长江口及其邻近海域泥沙输运及其动力机制[D]. 上海: 华东师范大学, 2018.
[25] LIANG B C, LI H J, LEE D Y. Bottom shear stress under wave-current interaction[J]. Journal of Hydrodynamics Ser B, 2008, 20(1): 88-95. DOI: 10.1016/S1001-6058(08)60032-3.
[26] 吴宇帆. 长江河口细颗粒泥沙沉降速度研究[D]. 上海: 华东师范大学, 2016.
[27] 刘红, 何青, 吉晓强, 等. 波流共同作用下潮滩剖面沉积物和地貌分异规律——以长江口崇明东滩为例[J]. 沉积学报, 2008(5): 833-843
[28] 戴苒, 朱建荣. 长江口崇明东滩风况统计分析[J]. 华东师范大学学报(自然科学版), 2015(4): 17-25
[29] 庞启秀, 白玉川, 杨华, 等. 淤泥质浅滩泥沙临界起动切应力剖面确定[J]. 水科学进展, 2012, 23(2): 249-255
[30] 赵振兴, 何建京. 水力学[M]. 2版. 北京: 清华大学出版社, 2010: 176.
[31] 戴苒. 长江河口河床泥沙临界起动应力空间分布[D]. 上海: 华东师范大学, 2016.