地理研究 ›› 2009, Vol. 28 ›› Issue (3): 571-582.doi: 10.11821/yj2009030002

• 地表过程研究 • 上一篇    下一篇

黄河入海泥沙悬移输送机制的控制试验

李国胜1, 王海龙2   

  1. 1. 中国科学院地理科学与资源研究所, 北京 100101;
    2. 广东省电力设计研究院, 广州 510663
  • 收稿日期:2008-11-26 修回日期:2009-02-23 出版日期:2009-05-25 发布日期:2009-05-25
  • 作者简介:李国胜(1963-),男,江苏常州人,研究员。主要从事海陆相互作用过程遥感与GIS数值模式研究。E-mail: ligs@igsnrr.ac.cn
  • 基金资助:

    国家自然科学基金资助项目(40771030;40571020)

Controlling experiments for dynamic mechanisms of suspended transport of SPM introduced from the Yellow River to the Bohai Sea

LI Guo-sheng1, WANG Hai-long2   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Guangdong Electric Power Design Institute, Guangzhou 510663, China
  • Received:2008-11-26 Revised:2009-02-23 Online:2009-05-25 Published:2009-05-25
  • Supported by:

    国家自然科学基金资助项目(40771030;40571020)

摘要:

以三维斜压动力—悬沙模型ECOMSED联合第三代海浪模型SWAN及Grant-Madsen浪流耦合底边界层模型,对黄河入海泥沙悬移扩散的时空变化过程进行了数值模拟。通过5项控制试验,初步揭示了不同动力因子对黄河入海泥沙悬移输送的贡献和影响。研究结果表明,单纯潮流作用下黄河入海悬沙不能形成长距离输送。风海流作用下,绝大部分悬沙直接沉降在黄河三角洲的附近,只有非常小的部分发生长距离输送。风场作用下,黄河入海悬沙主要向北-西北方向输送,部分输往莱州湾的悬沙继续向北输送。环流作用下,悬沙输送具有明显的三维结构,分层结构与环流结构基本一致,而深度平均的悬沙输送通量与环流结构有较大的差别。浪流联合作用下的悬沙浓度变化与底剪切应力都呈现为10天左右的变化周期,表明其变化主要是由风应力所控制。

关键词: 黄河入海泥沙, 悬移输运, 动力机制, 控制试验

Abstract:

Five controlling experiments with a 3D diagnostic model including a wave-current coupled model, the third generation wave model SWAN (Simulating WAves Nearshore) and the bottom boundary layer model driven by the monthly discharge and sediment load of the Yellow River, was conducted to individually explore the effects of tidal currents, wind waves, residual circulation and the Bohai Sea circulation. The simulations on the temporal-spatial variation of SPM (Suspended Particular Matter) concentration and sediment flux from the Yellow River to the Bohai Sea were carried out. It could be discerned that the surface sediment concentration in the waters is quite low except for the Yellow River estuary. The sediment from the Yellow River cannot be delivered in long distance under the condition of tidal currents. Almost all the sediment from the Yellow River is deposited out of the river delta under the condition of the wind-driven residual circulation, and part of the inflow sediment is delivered to and deposited in the Bohai Gulf and the Laizhou Bay. The temporal variation of the suspended load concentration in vertical direction indicates that, the bottom shear stress induced by the wind-driven currents cannot reach the critical shear stress for erosion, and then no re-suspension is incurred. On the basis of wind forcing, the sediment from the Yellow River is mainly transported north-northwestward, and some sediment which is first delivered to the Laizhou Bay is continuously moved northward. On the basis of wind-driven and tide-induced residual circulation, the suspended load transport depicts an obvious 3D structure characteristic, and the depth-integrated sediment flux is quite different from the residual circulation in the Bohai Sea. The residual circulation cannot satisfy the transport structure of the suspended particle matters in the Bohai Sea, especially for the suspended load with complicated vertical processes. The phase of the temporal variation of the sediment concentration and transport pattern due to the interaction between waves and currents is consistent with that of the bottom shear stress, which is modulated by the wind variation, all of which is proved to have a ten-day cycle. Around the Yellow River estuary, currents fields contribute a lot to the outward transportation of the sediment. In other waters, the surface waves-induced bottom shear stress due to the wind forcing makes enormous sediment re-suspended locally, which continues to be transported by horizontal currents.

Key words: sediement from the Yellow River, suspended load transport, dynamic mechanism, controlling experiment