基于雨洪调蓄的城市新区湿地适宜性评价及保护区划定

发布时间：2018-11-25 11:23

【摘要】：快速城市化背景下,城市的河道、湖泊、水库、塘堰、水田等湿地面积急剧减少,湿地雨洪调蓄能力减弱,城市弹性降低,城市安全受到威胁。为构建韧性城市,需保护城市生态底板。以重庆两江新区为例,根据湿地发育条件,选取地形坡度、土壤类型、地表径流等7项指标为影响湿地保护的主要因子,构建湿地适宜性评价层次结构模型,得到研究区湿地空间适宜性分布格局,即湿地保护重要性梯度空间分布。通过构建SWAT模型,根据重庆年径流总量控制率对应的设计日降雨量,得到不同控制率下的两江新区设计湿地率及其空间分布,与现状湿地叠加耦合,得到需要保护的湿地范围。该研究对湿地保护与编制雨洪管理规划具有指导意义。
[Abstract]:Under the background of rapid urbanization, the wetland area of city, such as river, lake, reservoir, pond Weir, paddy field and so on, has been reduced sharply, the capacity of rainwater flood regulation and storage of wetland has been weakened, the elasticity of city has been reduced, and the safety of city has been threatened. In order to build a resilient city, it is necessary to protect the ecological floor of the city. Taking Liangjiang New area of Chongqing as an example, according to the conditions of wetland development, 7 indexes, such as terrain slope, soil type and surface runoff, are selected as the main factors affecting wetland protection, and the hierarchy structure model of wetland suitability evaluation is constructed. The spatial suitability distribution pattern of wetland in the study area was obtained, that is, the spatial distribution of wetland conservation importance gradient. Based on the design daily rainfall corresponding to the total runoff control rate of Chongqing, the design wetland rate and its spatial distribution in Liangjiang New area under different control rates are obtained by constructing SWAT model, and coupled with the current wetland, and the wetland scope in need of protection is obtained. The study is of guiding significance for wetland protection and planning for rainwater management.
【作者单位】：华夏幸福基业股份有限公司;
【基金】：水体污染控制与治理科技重大专项“重庆两江新区城市水系统构建技术研究与示范”(编号2012ZX07307001-03)资助
【分类号】：TU992;TV213.9

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