| 摘要: |
| 湿地具有固碳释氧、涵养水源等作用，改善水体交换能力是湿地研究热点之一，但关于潮汐变动水位条件下湿地水体调控措施的探究相对较少。以长江南京段绿水湾湿地为例，建立平面二维水动力模型，开展感潮河段城市湿地水动力模拟及改善方案研究。计算不同水文条件及闸泵调度方案下湿地流场，分析潮位变动对绿水湾湿地水动力的影响，分析不同闸泵调度措施对水体流动性的改善效果。研究表明，闸泵联合调度可使得枯季大部分区域水动力明显增强，但仍存在主槽外坑塘等局部滞水区，需通过湿地植被重构的方式提高水体自净能力。对藻类易暴发的4~5月，闸泵联合调度可使得绿水湾内上游区域的水动力条件有较好改善效果，对于改善效果并不明显的下游区域建议增设补水点，降低水体富营养化风险。本研究可为绿水湾湿地的设计、建设与管理提供科学依据。 |
| 关键词: 城市湿地 二维水动力模型 感潮河段 闸泵调度 生态补水 |
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| Study on hydrodynamic simulation and improvement scheme of urban wetland in tidal reach-Taking Nanjing Lvshuiwan wetland as an example |
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DING Lei1, CHEN Liming2, WANG Yifei1, JIAO Jian1, SUN Jieying1
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1.Nanjing Hydraulic Research Institute, Key Laboratory of Port, Waterway and Sedimentation Engineering of Ministry of Transport;2.State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering, Nanjing Hydraulic Research Institute
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| Abstract: |
| Wetland has the functions of carbon sequestration, oxygen release and water conservation, and improving water exchange capacity is one of the hot spots in wetland research. However, there are relatively few researches on wetland water regulation measures under the condition of tidal variable water level. Taking the Lvshuiwan Wetland in Nanjing section of Yangtze River as an example, a two-dimensional hydrodynamic model was established, and the hydrodynamic simulation and improvement scheme of urban wetland in the tide-sensing reach were carried out. The wetland flow field under different hydrological conditions and sluice pump scheduling scheme was calculated, the influence of tidal level change on the Lvshuiwan Wetland hydrodynamics was analyzed, the improvement effect of different sluice pump scheduling measures on water flow was analyzed. The results show that the combined sluice-pump operation can significantly enhance the hydrodynamic force in most areas in dry season, but there are still some local stagnant areas such as pits outside the main trough, so it is necessary to improve the self-purification capacity of water body by means of wetland vegetation reconstruction. In April and May, when algae outbreaks are easy, the combined operation of sluice pump can improve the hydrodynamic conditions in the upstream area of Lvshuiwan Wetland. For the downstream area where the improvement effect is not obvious, it is suggested to add water refill points to reduce the risk of water eutrophication. This study can provide a scientific basis for the design, construction and management of Lvshuiwan Wetland. |
| Key words: urban wetland, two-dimensional hydrodynamic model, tidal river reach, sluice and pump scheduling, ecological water replenishment |
