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椒江河口层化动力特性研究

姚炎明 郑逸群 赵新宇 袁金雄 李莉

姚炎明,郑逸群,赵新宇,等. 椒江河口层化动力特性研究[J]. 海洋学报,2021,43(10):23–37 doi: 10.12284/hyxb2021135
引用本文: 姚炎明,郑逸群,赵新宇,等. 椒江河口层化动力特性研究[J]. 海洋学报,2021,43(10):23–37 doi: 10.12284/hyxb2021135
Yao Yanming,Zheng Yiqun,Zhao Xinyu, et al. Characteristics of stratification in the Jiaojiang Estuary[J]. Haiyang Xuebao,2021, 43(10):23–37 doi: 10.12284/hyxb2021135
Citation: Yao Yanming,Zheng Yiqun,Zhao Xinyu, et al. Characteristics of stratification in the Jiaojiang Estuary[J]. Haiyang Xuebao,2021, 43(10):23–37 doi: 10.12284/hyxb2021135

椒江河口层化动力特性研究

doi: 10.12284/hyxb2021135
基金项目: 国家重点研发计划项目(2020YFD0900803);国家自然科学基金(41976157);中央高校基本科研业务费;浙江省基金(2020C03012)
详细信息
    作者简介:

    姚炎明(1964-),男,浙江省嘉兴市人,主要从事河口泥沙动力学研究。E-mail:hotfireyao@163.com

    通讯作者:

    李莉(1982-),女,山东省青岛市人,主要从事河口动力与泥沙动力学研究。E-mail:lilizju@zju.edu.cn

  • 中图分类号: P731.2

Characteristics of stratification in the Jiaojiang Estuary

  • 摘要: 基于椒江河口大、小潮期间水位、流速、盐度和悬沙浓度观测数据,研究了椒江河口主潮汐通道的水动力、盐度和悬沙浓度的时空变化特征,解释了高浊度强潮作用下的层化物理机制。椒江河口大潮期悬沙浓度和盐度均大于小潮期,主潮汐通道区域落潮期悬沙浓度大于涨潮期;盐度随潮变化,盐水锋面出现在S2测站,锋面附近出现最大浑浊带;自陆向海,悬沙浓度递减,盐度递增;随水深增加,悬沙浓度与盐度递增。Richardson数与混合参数显示,盐度和悬沙引起的层化现象,是随着潮汐的变化而变化,涨潮时的层化均强于落潮,小潮时的层化持续时间最长,区域更广。混合参数随潮周期变化,大潮期高于临界值1.0,小潮期低于临界值1.0。小潮期水体层化强于大潮期;潮汐应变项是影响势能差异变化率的重要因素;落潮期间层化向混合状态转化,涨潮相反。
  • 图  1  椒江河口测站位置(采用1985国家高程基准面)

    Fig.  1  Locations of the field stations in the Jiaojiang Estuary (refers to the 1985 National Vertical Datum of China)

    图  2  H1、H2站潮位时间序列

    Fig.  2  Time series of tide elevation at stations H1 and H2

    图  3  5个测站大潮期垂向各层流速大小和方向的时间序列(起始时间为2014年8月26日上午8点)

    Fig.  3  Time series of vertical current profiles during spring tides at the 5 field stations (the x-axis is in hours from 8:00 a.m., August 26, 2014)

    图  4  5个测站小潮期垂向各层流速大小和方向的时间序列(起始时间为2014年9月3日上午8点)

    Fig.  4  Time series of vertical current profiles during neap tides at the 5 field stations (the x-axis is in hours from 8:00 a.m., September 3, 2014)

    图  5  5个测站大小潮期(上为大潮期,下为小潮期)垂向悬沙浓度剖面时间序列

    Fig.  5  Time series of vertical profiles of suspended sediment concentration during spring (upper panel) and neap (lower panel) tides at the 5 field stations

    图  6  5个测站大小潮期(上为大潮期,下为小潮期)垂向盐度剖面时间序列

    Fig.  6  Time series of vertical profiles of salinity during spring (upper panel) and neap (lower panel) tides at the 5 field stations

    图  7  大潮期流速(a)、盐度(b)和悬沙浓度沿主潮汐通道分布(c)

    矢量表示当前的方向和速度。x轴的起点是1号站

    Fig.  7  Along channel distribution of current speed (a), salinity (b) and suspended sediment concentration (c) during spring tide

    The vectors indicate current directions and speeds. The starting point of the x-axis is station 1

    图  8  5个测站大小潮期(上为大潮期,下为小潮期)只考虑盐度的水体密度(黑线)时和考虑盐度和悬沙浓度的水体密度的log10(Ri/0.25)时间序列

    Fig.  8  Time series of the Richardson number log10(Ri/0.25) considering only salinity in the calculation of water density (black lines), and considering salinity and suspended sediment concentration in the calculation of water density (red lines) during spring (upper panel) and neap (lower panel) tides at the 5 stations

    图  9  S3测站大小潮期潮位(Ele)(a)、流速(U)(b)、势能差异(φ)(c)、潮汐应变(Strain)(d)、河流效应(Riv)(e)、重力环流(Circ)(f)、潮汐搅动(Stir)(g)、势能差异的总时间导数(Total)(h)和log10(Si)时间序列(i),左列为大潮期,右列为小潮期

    黑色线为只考虑盐度计算水体密度,红色线为考虑盐度和悬沙浓度计算水体密度

    Fig.  9  Time series of the tidal elevation (Ele) (a), current speed (U) (b), potential energy anomaly (φ) (c), tidal straining (Strain) (d), river effect (Riv) (e), gravitational circulation (Circ) (f), tidal stirring (Stir) (g), total time derivative of the potential energy anomaly (Total) (h), and the Simpson number log10(Si) (i) at Station S3

    Considering only salinity in the calculation of water density (black lines), and considering suspended sediment concertration and salinity in the calculation of water density (red lines)

    表  1  关于层化机制研究的部分相关文献

    Tab.  1  References of stratification mechanism research

    作者(年份)名称公式注释
    Holzman[8](1943)梯度 Richardson 数(Ri$Ri = - \dfrac{g}{\rho } \cdot \dfrac{{\partial \rho }}{{\partial z}} \cdot {\left( {\dfrac{{\partial u}}{{\partial z}}} \right)^{ - 2}}$反映层化与剪切之间的平衡关系和水体的整体稳定性(Monismith[9](2010))
    Linden[10](1979)通量 Richardson 数(Rif${Ri_f} = \dfrac{{g\overline {{\rho '}{w'}} }}{{\rho u_*^2\partial U/\partial Z}}$可利用湍动能中转化为层化势能的比例,衡量混合效率
    Bowden[11](1981)整体 Richardson 数(Rio$R{i_o} = - \dfrac{{g\Delta \rho h}}{{\rho {{\left( {\Delta u} \right)}^2}}}$湍流卷挟强度与Rio关系紧密
    Simpson和
    Bowers [12](1981)
    势能差异(Potential Energy Anomaly)$\phi {\rm{ = } }\dfrac{1}{h}\displaystyle\int_{ - h}^0 {(\overline \rho - \rho )} gz{\rm{d}}z$,$\overline \rho = \dfrac{1}{h}\displaystyle\int_{ - h}^0 \rho {\rm{d}}z$使水体在垂向上达到完全混合状态所需要的能量,量化层化的强度
    Simpson等[13](1990)一维势能差异方程$\begin{aligned}\dfrac{{\partial \phi }}{{\partial t}} =& {\left(\dfrac{{\partial \phi }}{{\partial t}}\right)_{{\rm{strain}}}} + {\left(\dfrac{{\partial \phi }}{{\partial t}}\right)_{{\rm{cir}}}} - \\&{\left(\dfrac{{\partial \phi }}{{\partial t}}\right)_{{\rm{stir}}}} - {\left(\dfrac{{\partial \phi }}{{\partial t}}\right)_{{\rm{wind}}}}\\ = &0.031gh\overline {{u_t}} \dfrac{{\partial \rho }}{{\partial x}} + 0.003\;1\dfrac{{{g^2}{h^4}}}{{A\rho }}{\left(\dfrac{{\partial \rho }}{{\partial x}}\right)^2} -\\& \varepsilon k\rho \dfrac{{{{\left| {\overline u } \right|}^3}}}{h} - \delta {k_s}{\rho _a}\dfrac{{{{\overline W }^3}}}{h}\end{aligned}$影响河口水体层化的多种物理机制,定量分析河口水体层化的形成与衰退
    Monismith和Fong[14](1996)Simpson 数(Si
    (或水平Richardson 数(Rix))
    $Si = \dfrac{{\beta g{h^2}}}{{{C_D}U_T^2}}\dfrac{{\partial S}}{{\partial x}}$表征潮汐应变与湍流混合平衡关系的无量纲参数
    Verspecht等[15](2009)改进的水平Richardson 数(Rix$R_x^{wt} = - \dfrac{g}{\rho }\dfrac{{\partial \rho }}{{\partial x}}\dfrac{{{H^2}}}{{u_{wt}^2}}$,${u_{wt}} = {\left( {u_{\max }^2 + \dfrac{{{\rho _a}}}{{{\rho _0}}}{W^2}} \right)^{1/2}}$包含潮汐和风的共同作用。可以较好的指示层化发展和破坏的时间,但不能准确的判断层化的强度
    Burchard和Hofmeister[16](2008)三维势能差异方程$\begin{aligned}{\partial _t}\phi =& - {\nabla _h}\left( {\overline u \phi } \right) + \dfrac{g}{D}{\nabla _h}\overline \rho \cdot \int_{ - H}^\eta z \overline u {\rm{d} }z - \\ &\dfrac{g}{D}\int_{ - H}^\eta {\left( {\eta - \dfrac{D}{2} - z} \right)} \overline u \cdot {\nabla _h}\overline \rho {\rm{d} }z-\\ & \dfrac{g}{D}\int_{ - H}^\eta {\left( {\eta - \dfrac{D}{2} - z} \right)} \overline w \cdot {\partial _z}\overline \rho {\rm{d} }z + \dfrac{ { {\rho _0} } }{D}\int_{ - H}^\eta { {P_b}{\rm{d} }z} -\\ & \dfrac{ { {\rho _0} } }{2}\left( {P_b^s + P_b^b} \right)+ \dfrac{g}{D}\int_{ - H}^\eta {\left( {\eta - \dfrac{D}{2} - z} \right)} Q{\rm{d} }z + \\ & \dfrac{g}{D}\int_{ - H}^\eta {\left( {\eta - \dfrac{D}{2} - z} \right)} {\nabla _h}\left( { {K_h}{\nabla _h}\rho } \right){\rm{d} }z\end{aligned}$包含了经验方程中未包含但能够对势能差异产生影响的其他机制(平流、深度平均应变、非平均应变、垂向对流、垂向混合)
    Song等[17](2013)考虑泥沙对水体层化的影响$\begin{aligned}{\varphi _{{\rm{tot}}} } =& \dfrac{1}{D}\int_{ - h}^\eta {\left( {\overline { {\rho _w} } - {\rho _w} } \right)} gz{ {\rm{d} } }z + \dfrac{1}{D}\int_{ - h}^\eta {\left( {\overline C - C} \right)} gz{\rm{d} }z - \\& \dfrac{1}{ { {\rho _s}D} }\int_{ - h}^\eta {\left( {\overline { {\rho _w}C} - {\rho _w}C} \right)} gz{\rm{d}}z\end{aligned}$将泥沙浓度考虑进水体密度,进而影响势能
    Pu等[18](2015)改进的纵向一维势能
    差异方程
    $\begin{aligned}\dfrac{{\partial \phi }}{{\partial t}} =& {\left(\dfrac{{\partial \phi }}{{\partial t}}\right)_{{\rm{strain}}}} + {\left(\dfrac{{\partial \phi }}{{\partial t}}\right)_{{\rm{river}}}} + {\left(\dfrac{{\partial \phi }}{{\partial t}}\right)_{{\rm{cir}}}} - \\&{\left(\dfrac{{\partial \phi }}{{\partial t}}\right)_{{\rm{stir}}}} - {\left(\dfrac{{\partial \phi }}{{\partial t}}\right)_{{\rm{wind}}}}\\ =& 0.035gh\overline {{u_t}} \dfrac{{\partial \rho }}{{\partial x}} + 0.035gh\overline {{u_r}} \dfrac{{\partial \rho }}{{\partial x}} +\\& 0.003\;1\dfrac{{{g^2}{h^4}}}{{{N_z}\rho }}{\left(\dfrac{{\partial \rho }}{{\partial x}}\right)^2} - \varepsilon k\rho \dfrac{{{{\left| {\overline u } \right|}^3}}}{h} - \delta {k_s}{\rho _a}\dfrac{{{{\overline W }^3}}}{h}\end{aligned}$考虑河口效应对层化的影响
    Li等[19](2018)考虑泥沙对水体层化的影响,消除水深对势能差异的影响$\begin{aligned}& {\rho _{ss}} = {\rho _0}\left( {1 + \beta {S_w}} \right) + \left[ {1 - \dfrac{{{\rho _0}\left( {1 + \beta {S_w}} \right)}}{{{\rho _s}}}} \right]C\\& Ri = - \dfrac{g}{{{\rho _{ss}}}} \cdot \dfrac{{\partial {\rho _{ss}}}}{{\partial z}} \cdot {\left( {\dfrac{{\partial u}}{{\partial z}}} \right)^{ - 2}}\end{aligned}$
    $Sr = \dfrac{\varphi }{ {\overline \varphi } } \cdot 100 {\text \%} = \dfrac{ {\dfrac{1}{h}\int_{ - h}^0 {\left( {\overline { {\rho _i} } - {\rho _i} } \right)gz{\rm{d}}z} } }{ {\dfrac{1}{h}\int_{ - h}^0 { {\rho _i}gz{\rm{d}}z} } } \cdot 100 {\text \%}$
    将泥沙浓度考虑进水体密度,影响RiSr以及势能差异等
    下载: 导出CSV

    表  2  水文、泥沙观测参数及时间

    Tab.  2  Hydrological, sediment observation parameters and time

    测站观测时间观测参数
    H1, H28月16日至9月15日,8月11日至9月15日潮位
    S1−S5大、小潮期流速流向、悬沙浓度、盐度、
    底床泥沙
      注:①流速流向观测均采用6点法:表层,0.2H,0.4H,0.6H,0.8H,底层。②盐度采用三点法:表层,0.6H,底层。悬沙浓度采用3点法:表层,0.6H,底层。③采样时间为大潮期(8月26日08:00至8月27日11:00)和小潮期(9月3日08:00至9月4日11:00)。
    下载: 导出CSV

    表  3  观测仪器

    Tab.  3  Observation instruments

    仪器名称类型用途
    直读海流仪、
    水文绞车
    SLC9-2、HY-100型定点海流观测
    DGPS测量系统DGPS-MAX测站定位
    自记式水位计TGR-2050型潮位观测
    横式采样器XCL型2升悬沙、悬移质、盐度取样
    下载: 导出CSV

    表  4  各潮位站主要全日、半日和浅海分潮的特征

    Tab.  4  Main characteristics of the tidal constituents at stations H1 and H2

    分潮H1(8月16日至9月15日)H2(8月11日至9月15日)
    振幅/m迟角/(°)振幅/m迟角/(°)
    K10.23230.970.253 8229.06
    O10.23183.970.236 8172.36
    M21.82256.801.693 9246.79
    S20.83308.500.767 9293.60
    M40.14103.620.014 283.61
    MS40.13136.970.010 657.05
    M60.01324.320.020 4290.71
    下载: 导出CSV

    表  5  由调和常数计算的潮汐性质和潮汐特征

    Tab.  5  Tidal characteristics calculated by harmonic constants

    项目H1(8月16日
    至9月15日)
    H2(8月11日
    至9月15日)
    潮汐性质(HK1+HO1)/HM20.250.29
    主要半日分潮振幅比(HS2/HM20.460.45
    主要浅水分潮与主要半日分潮振幅比(HM4/HM20.080.01
    主要半日、全日分潮迟角差:G(M2)−[G(K1)+G(O1)]201.86°205.37°
    主要半日和浅海分潮迟角差:2G(M2)−G(M449.98°49.97°
    主要浅海分潮振幅和(M4+MS4+M627.92 cm4.52 cm
    下载: 导出CSV

    表  6  5个测站大、小潮余流计算结果

    Tab.  6  Residual currents during spring and neap tides at the 5 field stations

    测站层次大潮小潮
    流速/(m·s−1)流向/(°)流速/(m·s−1)流向/(°)
    S1表层0.1151680.105138
    中层0.1191740.063259
    底层0.1261770.066242
    S2表层0.3921370.237149
    中层0.3071510.166185
    底层0.1651570.106226
    S3表层0.4991090.203105
    中层0.3831060.068109
    底层0.0671010.054269
    S4表层0.4211120.094110
    中层0.2931060.057108
    底层0.1241110.055297
    S5表层0.2342150.15212
    中层0.0671850.078217
    底层0.0181050.017229
    下载: 导出CSV

    表  7  各测站大小潮期盐度、悬沙浓度对层化的贡献占比

    Tab.  7  Contributions of salinity and suspended sediment concentration to the stratification during spring and neap tides at the 5 field stations

    测站大潮期小潮期
    盐度贡献/%悬沙浓度贡献/%盐度贡献/%悬沙浓度贡献/%
    最大最小平均最大最小平均最大最小平均最大最小平均
    S189.613.755.886.310.444.298.291.895.78.21.84.3
    S285.035.763.764.315.036.397.391.695.38.42.84.7
    S387.042.773.557.313.026.598.189.895.910.21.94.1
    S488.726.154.573.911.345.596.858.587.941.53.212.1
    S586.66.634.293.413.465.887.046.370.053.713.030.0
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-07-06
  • 修回日期:  2021-04-17
  • 网络出版日期:  2021-09-02
  • 刊出日期:  2021-10-30

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