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    基于数值模拟的城市景观水体生态设计研究——以广西苍海湖为例

    关键词:风景园林;数值模拟;苍海湖;水环境质量;水体景观规划;人工湿地

    Key words:landscape architecture; numerical modelling; Canghai Lake; water environment quality; aquatic landscape planning; constructed wetland

    摘要:城市水体景观规划需要实现水质改善和景观优化的双重目标,以营造良好的水生态景观环境。以广西苍海湖为例,应用MIKE 21水环境模拟软件,建立湖区二维水动力和水质模型,模拟湖区水流及水质条件,提出湖区水动力强化和水质提升的总体策略。研究发现,在规划中新增入湖口人工湿地,通过合理配置挺水、浮水和沉水植物,构建高效植物生态系统,预期可削减入湖磷负荷45%以上,有效提升湖区水质,基本消除苍海湖大规模藻华爆发的风险,并形成湿地景观,从而实现水质提升和景观优化的有机统一。提出了集成水质模拟、水生态修复和水景观规划技术的湖泊生态景观综合规划方法,可为城市水体景观规划设计提供借鉴和参考。

    Abstract:Good aquatic ecological landscape should be planned and achieved based on the dual targets of water quality improvement and landscape optimization. Taking Canghai Lake in Guangxi Zhuang Autonomous Region as an example, a two-dimensional hydrodynamic and water quality model was established with MIKE 21 software for the lake, which was applied for the simulation of the lake flow and water quality conditions to propose an overall strategy of hydrodynamic and water quality enhancement. The results have indicated that the inflow phosphorus load will be reduced by more than 45% and the lake water quality will be improved with significantly reduced risk of large-scale algae bloom if a constructed wetland is included in the planning at the inlet of upstream river. The wetland will perform as a high-efficiency plant ecosystem with reasonable distribution of emergent, floating and submerged vegetation. The wetland will unify the functions of water quality enhancement and scenery attraction. The study has proposed a methodology of comprehensive lake ecological landscape planning with integrated technologies of water quality modelling, aquatic ecosystem rehabilitation and landscape planning, which can be applied as a tool for urban aquatic landscape planning and design.

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