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基于Delft 3D模型的感潮河口示踪模拟
李 嘉1, 郑向阳2, 张 华2, 姜德娟2, 王玉琳1, 蔡永兵3
1.扬州大学;2.中国科学院烟台海岸带研究所;3.安徽科技学院
摘要:
为研究感潮河口的水力特征及溶质扩散规律,本文通过布放仪器监测水文参数,采用荧光染色剂罗丹明B作为示踪剂开展现场示踪实验,基于Delft 3D模型对研究区的动力场和示踪结果进行模拟,获取了小清河口的水平湍流扩散系数。通过对比不同观测站的水深及电导率发现,调查期间(非汛期)小清河口的水力条件主要受潮汐控制,潮汐对河口下游的作用更明显。由于河流径流量较小,在潮汐作用下,示踪剂从小清河口向海传输的速度较慢,导致示踪剂在河口长时间滞留。动力学模型验证结果表明模拟结果可靠性高。通过水动力模块与示踪模块相耦合,本文成功模拟了不同观测站示踪剂的变化规律,相关性分析(R2)和均方根误差(RMSE)结果表明拟合结果理想。通过模型参数优化,得到小清河口的水平湍流扩散系数()为6t0.12 m2/s。
关键词:  示踪实验  Delft 3D  水平扩散系数  感潮河口  小清河
DOI:10.11759/hykx20191112002
分类号:X143
基金项目:国家自然科学基金资助项目(41671473);山东省海岸带环境过程重点实验室(中国科学院烟台海岸带研究所)开放基金(2019SDHADKFJJ12)
Simulation of tracer experiment in the tidal estuary based on Delft 3D model
lijia1, Zheng xiangyang2, Zhang hua2, Jiang Dejuan2, Wang Yulin1, Cai Yongbing3
1.Yangzhou University;2.Yantai Institute of Coastal Zone Research, Chinese Academy of Science;3.Anhui Science and Technology University
Abstract:
To reveal the hydraulic characteristics and solute diffusion process of the tidal estuary, field tracer experiment using Rhodamine B and hydrological survey were carried out in the Xiaoqing River Estuary. The Delft-3D model system was used to simulate the flow field of estuary and transport process of tracer experiment. The horizontal turbulent diffusion coefficient () was estimated based on the Delft-3D simulation. According to the water level and conductivity value at different sites, it can be concluded that hydraulic conditions of the Xiaoqing River Estuary, especially the lower reaches of tidal estuary, during experimental period were determined by tidal. Longitudinal transport velocity of tracer in the Xiaoqing River Estuary was slow due to the strong tidal and weak river flow. Correspondingly, residence time of tracer would be long in the research area. Delft3D-FLOW module provided a reliable hydrodynamic file for the simulation area. A coupled model based on Delft3D-FLOW and Delft3D-PART was used to simulate the results of tracer experiment. Correlation analysis (R2) and root mean square error (RMSE) showed an excellent fit of the model. The horizontal turbulent diffusion coefficient () was 6t0.12 m2/s. This research could provide data and guideline for subsequent water quality simulation work in the Xiaoqing River Estuary.
Key words:  tracer experiment  Delft 3D  horizontal turbulent diffusion coefficient  tidal estuary  Xiaoqing River
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