景观指数评价小区LID设计方案效果的适用性研究
- Title:
- Applicability of Landscape Index for Assessing Performance of Low Impact Development Schemes
- 关键词:
- font-size: 10pt; ">低影响开发; SWMM模型; 景观指数; 径流控制
- Keywords:
- font-size: 10pt; ">low impact development; SWMM; landscape index; runoff control
- 摘要:
-
构建某小区SWMM模型，基于年径流总量控制率计算小区低影响开发（LID）设施总调蓄容积，并按不同比例分配至LID设施，形成多套LID设计方案，模拟计算设计方案在不同降雨情景下的场次降雨径流控制效果。选取6种景观指数，分析其与设计方案场次降雨径流控制率的相关关系，探讨景观指数评价LID设计方案效果的适用性 。结果表明，香农多样性指数、香农均匀度指数与场次降雨径流控制率有较强的正相关性，斑块密度、分割度、最大斑块指数、斑块面积变异系数在特定情形下与场次降雨径流控制率有相关性，该结论可为小区尺度LID设计方案径流控制效果的简易预测提供参考。
- Abstract:
-
The SWMM model of a residential area was established. The total storage capacity of low impact development (LID) facilities in the residential area was calculated based on the volume capture ratio of annual rainfall. The storage capacity was distributed to the LID facilities in different proportions, and thus different LID design schemes were developed. The event rainfall runoff control effects of the design schemes under different rainfall scenarios were simulated. Six landscape indexes were selected to analyze their correlation with the event rainfall runoff control rate of the corresponding design schemes. The applicability of landscape index to evaluate the performance of the LID design scheme was explored. The Shannon diversity index and Shannon evenness index had strong positive correlations with the event rainfall runoff control rate in different cases, and the patch density, division, largest patch index and patch size coefficient of variation had correlations with the event rainfall runoff control rate in specific cases. The conclusion provided a reference for the prediction of runoff control effect of the residential area scale LID design scheme.
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