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This thesis aimed to analyze the stable multimodal (3-peaked) particle size distributions (PSDs) of flocs in the Zhujiang River Estuary with the field observation data getting by LISST and the bottom boundary layer observation system during the dry season in 2010. The results show that the mean diameter of the basic building blocks of flocs, so-called primary particle, is about 8.3–9.0 μm; the mean diameter of microflocs in a range of 36–100 μm, and macroflocs have a size range of 180 μm to thousands of micrometers. In the neap tidal periods, the suspension sediment of halocline is dominated by the macroflocs with strong flocculation process; the mean diameter of flocs is increases and is controlled by flocs during the moderate and spring tide. The dynamic change of the tide has little impact on the multimodal PSDs and morphological parameters, with aggregation and breakage of the flocculation in the dynamic equilibrium. Study results further demonstrate the turbulent dynamic mechanism of flocculation by combining the turbulence data collected by the bottom tripod and the simplified Population Balance Equation (PBE). It is that, the high shear of the peak flow would enhance breakage of macroflocs to microflocs and decrease the mean diameter of flocs, on the contrary, aggregation is much stronger than breakage. It also shows that PSDs are in according with observation by solving PBE based on gaussian moment integral method. It turns out that PBE which containes the turbulent dynamic mechanism can be used to study the flocculation of cohesive sediment with turbulence and PSDs data.
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本文利用2010年枯季在珠江口进行的大、中、小潮LISST剖面及底边界层观测资料,分析了磨刀门河口枯季稳定存在的絮团三峰结构,即构建絮团的基本粒子的平均粒径约为8.3~9.0 μm,小絮团为36~100 μm,大絮团大于180 μm。小潮期,盐跃层捕集的悬浮泥沙以强絮凝过程为主,大絮团含量占优;中、大潮期,平均粒径普遍增大,絮凝占优。潮内的动力变化对絮团多峰结构及形态参数的影响不明显,絮凝与解凝处于动态平衡。结合坐底三角架的湍流资料和简化的群体平衡模型(Population Balance Equation,PBE),进一步揭示了絮团变化的湍流动力机制。高流速下的强紊动剪切力,直接导致大絮团被破坏形成小絮凝体,絮凝体平均粒径减小,反之絮凝强于解凝作用。同时,基于高斯矩积分方法求解PBE,得到的粒径分布基本与观测值吻合,说明在有较好的现场湍流与粒径观测资料的条件下,PBE包含的湍流动力机制可以用来研究黏性泥沙的絮凝过程。
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任杰,张颖. 珠江口黏性泥沙絮凝的湍流动力机制[J]. 海洋学报,2019,41(9):105–113,doi:10.3969/j.issn.0253−4193.2019.09.010Ren Jie,Zhang Ying. The turbulent dynamic mechanism of flocculation of cohesive sediment in the Zhujiang River Estuary[J]. Haiyang Xuebao,2019, 41(9):105–113,doi:10.3969/j.issn.0253−4193.2019.09.010
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任杰(1975—),男,四川省南部县人,副教授,博士,主要从事近岸河口动力过程研究。E-mail:renjie@mail.sysu.edu.cn
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任杰(1975—),男,四川省南部县人,副教授,博士,主要从事近岸河口动力过程研究。E-mail:renjie@mail.sysu.edu.cn
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Amsterdam: Elsevier, 2008., articleTitle=null, refAbstract=null)], funds=[Fund(id=1254506253896581755, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, awardId=null, language=CN, fundingSource=国家自然科学基金(41476072)。, fundOrder=null, country=null)], companyList=[AuthorCompany(id=1254506238977442243, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, xref=1, ext=[AuthorCompanyExt(id=1254506238985830854, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, companyId=1254506238977442243, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1 Center for Coastal Ocean Science and Technology, School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China), AuthorCompanyExt(id=1254506238994219462, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, companyId=1254506238977442243, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1 中山大学 海洋科学学院 近岸海洋科学与技术研究中心,广东 广州 510275)])], figs=[ArticleFig(id=1254506245109514796, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=EN, label=Fig. 1, caption=
The Zhujiang River Estuary and research area (a) and the distribution of observation stations from December 15, 2010 to December 24, 2010 at Modaomen Estuary (b), figureFileSmall=Do+owE5kC87sJazdZHX6Cw==, figureFileBig=DeYBuqrQp+fb6fBWqzpdLQ==, tableContent=null), ArticleFig(id=1254506245289869870, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=CN, label=图1, caption=
磨刀门河口在珠江三河口湾中的位置(a)及2010年12月15–24日磨刀门水道水文观测站位分布(b), figureFileSmall=Do+owE5kC87sJazdZHX6Cw==, figureFileBig=DeYBuqrQp+fb6fBWqzpdLQ==, tableContent=null), ArticleFig(id=1254506245575082547, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=EN, label=Fig. 2, caption=
Three observations of the bottom boundary layer and corresponding tide types at Denglongshan Station, figureFileSmall=DMCtY+yYRrl/mx0fYpENMA==, figureFileBig=KB2/OSd8lI8cbSJ8wvUE5A==, tableContent=null), ArticleFig(id=1254506246191645238, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=CN, label=图2, caption=
灯笼山站边界层的3个观测测次时间与对应的潮型, figureFileSmall=DMCtY+yYRrl/mx0fYpENMA==, figureFileBig=KB2/OSd8lI8cbSJ8wvUE5A==, tableContent=null), ArticleFig(id=1254506247810646589, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=EN, label=Fig. 3, caption=
The time process of wind direction and speed during the observation, figureFileSmall=jVxCjR6pq/JAv+wm0Re6ww==, figureFileBig=pP5DWTtcaN3zMfy7GilLdw==, tableContent=null), ArticleFig(id=1254506248079082049, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=CN, label=图3, caption=
观测期间风速风向过程曲线, figureFileSmall=jVxCjR6pq/JAv+wm0Re6ww==, figureFileBig=pP5DWTtcaN3zMfy7GilLdw==, tableContent=null), ArticleFig(id=1254506248460763716, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=EN, label=Fig. 4, caption=
The profile distribution of velocity (a), salinity (b), volume concentration (c) and diameter of flocs (d) at M2 Station The positive (+), negative (-) values of the axial velocity represent the flood tide, ebb tide, respectively
, figureFileSmall=qumt5HrLyFAMkIjUkALHzA==, figureFileBig=eX5Bo8xyXe3UHMKPx4F/8A==, tableContent=null), ArticleFig(id=1254506248813085258, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=CN, label=图4, caption=
M2站剖面轴向流速(a),盐度(b),体积浓度(c),絮团粒径(d)分布 图中轴向流速的正值表示涨潮,负值表示落潮
, figureFileSmall=qumt5HrLyFAMkIjUkALHzA==, figureFileBig=eX5Bo8xyXe3UHMKPx4F/8A==, tableContent=null), ArticleFig(id=1254506249190572620, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=EN, label=Fig. 5, caption=
Particle size distributions of surface (a, d), middle/halocline (b, e) and bottom (c, f) layers in H1 (a, b and c) and S1(d, e and f) profiles, figureFileSmall=l0h+osgzzbCvUKHnKJH++A==, figureFileBig=NhcLsQIwXK1YG5Mzmh1ItQ==, tableContent=null), ArticleFig(id=1254506249383510609, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=CN, label=图5, caption=
H1剖面的粒径分布(a, b, c)和S1剖面的粒径分布(d, e, f)(a, d为表层;b, e为中层或跃层;c, f为底层), figureFileSmall=l0h+osgzzbCvUKHnKJH++A==, figureFileBig=NhcLsQIwXK1YG5Mzmh1ItQ==, tableContent=null), ArticleFig(id=1254506249626780244, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=EN, label=Fig. 6, caption=
Experimentally obtained steady-state particle size distributions with different shear rate (a) and time process of flocs evolution (b), figureFileSmall=tOHPdHyJbecqXLBkHcR1JQ==, figureFileBig=wTYYp7DJNIc05F3PWRGe6w==, tableContent=null), ArticleFig(id=1254506250054599256, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=CN, label=图6, caption=
不同剪切率下的粒径分布(a)及粒径随时间演化过程(b), figureFileSmall=tOHPdHyJbecqXLBkHcR1JQ==, figureFileBig=wTYYp7DJNIc05F3PWRGe6w==, tableContent=null), ArticleFig(id=1254506250390143583, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=EN, label=Fig. 7, caption=
The time process of shear rate and simulated mean diameter of particles (a) and particle size distributions (b) at M2 Station, figureFileSmall=FvZkRG8iPH6Cn6l43fQD2g==, figureFileBig=FA9p4qEcnymYb/X4b0IJyg==, tableContent=null), ArticleFig(id=1254506250629218916, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=CN, label=图7, caption=
M2站观测期间的剪切率与模拟的平均粒径(a)及颗粒粒径分布(b), figureFileSmall=FvZkRG8iPH6Cn6l43fQD2g==, figureFileBig=FA9p4qEcnymYb/X4b0IJyg==, tableContent=null), ArticleFig(id=1254506252613124711, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=EN, label=Table 1, caption=
The parameters set of the observation instruments
, figureFileSmall=null, figureFileBig=null, tableContent=
| 观测方式 | 仪器 | 参数设置 | 测量项目 |
| 船载系统 | LISST-100B | 整点下放,采样频率为1 Hz | 剖面泥沙粒径分布 |
| | CTD | 整点下放,采样频率为1 Hz | 温、盐、深 |
| 座底观测 | ADV | 采样频率为64 Hz,测量间隔为5 min,采样时间为3 min,位置分别为0.25 mab、1.35 mab | 单点三维高频流速、声强 |
| | OBS | 采样间隔1 min采样,平均时间为10 s,位置分别为0.4 mab、0.9 mab | 单点浊度 |
| | RBR-CTD | 采样频率为1 Hz,位置为0.5 mab | 温、盐、深 |
| | PC-ADP | 测量间隔为5 min,采样频率为1 Hz,每次测量180个剖面,盲区为0.10 m,位置为1.3 mab | 剖面流速 |
), ArticleFig(id=1254506252806062699, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=CN, label=表1, caption=
观测仪器设置参数
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| 观测方式 | 仪器 | 参数设置 | 测量项目 |
| 船载系统 | LISST-100B | 整点下放,采样频率为1 Hz | 剖面泥沙粒径分布 |
| | CTD | 整点下放,采样频率为1 Hz | 温、盐、深 |
| 座底观测 | ADV | 采样频率为64 Hz,测量间隔为5 min,采样时间为3 min,位置分别为0.25 mab、1.35 mab | 单点三维高频流速、声强 |
| | OBS | 采样间隔1 min采样,平均时间为10 s,位置分别为0.4 mab、0.9 mab | 单点浊度 |
| | RBR-CTD | 采样频率为1 Hz,位置为0.5 mab | 温、盐、深 |
| | PC-ADP | 测量间隔为5 min,采样频率为1 Hz,每次测量180个剖面,盲区为0.10 m,位置为1.3 mab | 剖面流速 |
), ArticleFig(id=1254506253091275376, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=EN, label=Table 2, caption=
A summary of flocs fitting parameters for particle size distributions at typical profiles
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| 剖面(观测时间) | 层位 | 观测值 | | 曲线拟合:平均粒径/μm | | 曲线拟合:体积浓度/μL·L–1 | | 曲线拟合:几何标准差 |
| H/m | V/μL·L–1 | D/μm | m1 | m2 | m3 | m1 | m2 | m3 | m1 | m2 | m3 |
| H1(2010年10月15日16时) | S | 1.6 | 47.5 | 47.1 | | 8.5 | 36 | 230 | | 4.4 | 30.1 | 21.9 | | 1.3 | 1.59 | 1.41 |
| | H | 5.5 | 2 674 | 178.3 | 43 | 100 | 237 | 43 | 1 824 | 1 836 | 1.21 | 1.2 | 1.27 |
| | B | 7.2 | 140 | 71 | 8.6 | 41 | 230 | 40 | 67 | 103 | 1.43 | 1.29 | 1.32 |
| H2(2010年10月15日21时) | S | 1.6 | 46 | 48 | 8.5 | 36 | 159 | 4 | 26 | 18 | 1.05 | 1.24 | 1.68 |
| | H | 5.6 | 3 883 | 155 | 50 | 99 | 178 | 154 | 521 | 3 294 | 1.42 | 1.06 | 1.2 |
| | B | 6.6 | 95.6 | 55.4 | 8.6 | 37 | 230 | 40 | 23 | 33 | 1.38 | 1.78 | 1.35 |
| S1(2010年10月20日17时) | S | 1 | 623 | 164 | 8.8 | 49 | 198 | 9 | 53 | 600 | 1.17 | 1.59 | 1.17 |
| | H | 3.6 | 655.2 | 165 | 8.9 | 51 | 200 | 9 | 58 | 633 | 1.17 | 1.66 | 1.17 |
| | B | 7.2 | 697 | 171 | 8.9 | 49 | 209 | 9 | 57 | 725 | 1.17 | 1.58 | 1.17 |
| S2(2010年10月21日4时) | S | 1 | 898 | 136 | 8.8 | 48 | 228 | 31 | 109 | 1 069 | 1.34 | 1.7 | 1.27 |
| | H | 3.2 | 910 | 133 | 8.8 | 49 | 238 | 31 | 180 | 1 219 | 1.34 | 1.72 | 1.29 |
| | B | 6.5 | 1 332 | 135 | 8.3 | 50 | 240 | 29 | 277 | 1 776 | 1.31 | 1.93 | 1.23 |
), ArticleFig(id=1254506253431014004, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840124563153115, language=CN, label=表2, caption=
特征剖面多峰结构的絮团拟合参数
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| 剖面(观测时间) | 层位 | 观测值 | | 曲线拟合:平均粒径/μm | | 曲线拟合:体积浓度/μL·L–1 | | 曲线拟合:几何标准差 |
| H/m | V/μL·L–1 | D/μm | m1 | m2 | m3 | m1 | m2 | m3 | m1 | m2 | m3 |
| H1(2010年10月15日16时) | S | 1.6 | 47.5 | 47.1 | | 8.5 | 36 | 230 | | 4.4 | 30.1 | 21.9 | | 1.3 | 1.59 | 1.41 |
| | H | 5.5 | 2 674 | 178.3 | 43 | 100 | 237 | 43 | 1 824 | 1 836 | 1.21 | 1.2 | 1.27 |
| | B | 7.2 | 140 | 71 | 8.6 | 41 | 230 | 40 | 67 | 103 | 1.43 | 1.29 | 1.32 |
| H2(2010年10月15日21时) | S | 1.6 | 46 | 48 | 8.5 | 36 | 159 | 4 | 26 | 18 | 1.05 | 1.24 | 1.68 |
| | H | 5.6 | 3 883 | 155 | 50 | 99 | 178 | 154 | 521 | 3 294 | 1.42 | 1.06 | 1.2 |
| | B | 6.6 | 95.6 | 55.4 | 8.6 | 37 | 230 | 40 | 23 | 33 | 1.38 | 1.78 | 1.35 |
| S1(2010年10月20日17时) | S | 1 | 623 | 164 | 8.8 | 49 | 198 | 9 | 53 | 600 | 1.17 | 1.59 | 1.17 |
| | H | 3.6 | 655.2 | 165 | 8.9 | 51 | 200 | 9 | 58 | 633 | 1.17 | 1.66 | 1.17 |
| | B | 7.2 | 697 | 171 | 8.9 | 49 | 209 | 9 | 57 | 725 | 1.17 | 1.58 | 1.17 |
| S2(2010年10月21日4时) | S | 1 | 898 | 136 | 8.8 | 48 | 228 | 31 | 109 | 1 069 | 1.34 | 1.7 | 1.27 |
| | H | 3.2 | 910 | 133 | 8.8 | 49 | 238 | 31 | 180 | 1 219 | 1.34 | 1.72 | 1.29 |
| | B | 6.5 | 1 332 | 135 | 8.3 | 50 | 240 | 29 | 277 | 1 776 | 1.31 | 1.93 | 1.23 |
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