A study on the application of low impact development of green roof in large underground buildings based on SWMM

LIU Zhifeng,CHEN Chen

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2018, Vol. 42 ›› Issue (06) : 165-173.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2018, Vol. 42 ›› Issue (06) : 165-173. DOI: 10.3969/j.issn.1000-2006.201808025

A study on the application of low impact development of green roof in large underground buildings based on SWMM

  • LIU Zhifeng1,CHEN Chen2
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Abstract

【Objective】This paper explored regulations and low impact development ideas, which storage and intercept rainwater and retard storm runoff in the green roofs of large-scale underground buildings of sponge city.【Method】Based on the combination of qualitative analysis and quantitative calculation, the key influencing factors of green roof runoff control system were combed and the method of development and application is given. With the help of storm water ma-nagement model(SWMM)soft, the influence of the rainstorm intensity, green roof ratio, soil thickness and soil porosity were studied.【Result】The green roof ratio plays an important role in runoff regulation. The critical parameters for short-term, medium-short-term and medium-long-term rainstorm intensity design are 40%, 50% and 60%, respectively. The effect of soil thickness on runoff reduction of short-term rainstorm disaster design is more significant. The increase of the soil thickness will bring about a certain degree of runoff reduction. However, the thickness of soil at inflection point corresponding to the design of rainstorm intensity once a year and many within a year is different, which is 300 mm and 400 mm, respectively. Soil porosity has little effect on runoff reduction, but when the soil porosity is 0.30, the lowest effect of runoff reduction, it should be avoided in development and application. 【Conclusion】Planting vegetation, soil property and rainfall intensity are the main factors affecting the runoff regulation on green roofs. Safety design of controllable factors and calibration parameters of uncertain factors should be properly allocated in practical development and application, it can be used in the structure design of the in the green roofs of large-scale underground buildings to consider loading design, and it also can be considered as a reference basis to improve the effectiveness of runoff regulation on green roofs and to reduce the impact on development and application practice.

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LIU Zhifeng,CHEN Chen. A study on the application of low impact development of green roof in large underground buildings based on SWMM[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2018, 42(06): 165-173 https://doi.org/10.3969/j.issn.1000-2006.201808025

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