Wu Jianghua, LIU Kang, Zhang Hongjuan, et al. Impacts of Landscape Pattern Changes on Surface Runoff in Main Urban Area of Xi'an City[J]. Bulletin of Soiland Water Conservation, 2021, 41(4): 83-92.
DOI:
Wu Jianghua, LIU Kang, Zhang Hongjuan, et al. Impacts of Landscape Pattern Changes on Surface Runoff in Main Urban Area of Xi'an City[J]. Bulletin of Soiland Water Conservation, 2021, 41(4): 83-92. DOI: 10.13961/j.cnki.stbctb.2021.04.012.
Impacts of Landscape Pattern Changes on Surface Runoff in Main Urban Area of Xi'an City
[Objective] The spatial correlation between the evolution of landscape pattern and surface runoff was explored
in order to propose a landscape pattern optimization strategy that could effectively alleviate urban waterlogging and provide suggestions for urban ecological safety. [Methods] Based on the remote sensing data sets from 2000 to 2019
the spatial distribution map of landscape patterns in the main urban area of Xi’an City was extracted
and validated with actual land use data. The methods of SCS model
landscape pattern index
ArcGIS and Pearson correlation analysis were employed to analyze the landscape pattern changes and its impacts on surface runoff. [Results] ① From 2000 to 2019
the landscape pattern showed a developing trend of high connectivity and high aggregation
regular patch shape
homogenization and stabilization
and the patch spread decreased. At the same period
the surface runoff depth increased year by year
however
the increase of runoff depth showed a downward trend with the time. In 2000—2005
2005—2010
2010—2015
2015—2019
the increment of runoff depth was 4.99
4.95
3.55
and 3.33 mm respectively
indicating that retention effect of landscape pattern on surface runoff increased gradually. ② The correlation between the change rate of landscape pattern index and the annual growth rate of surface runoff was significant
and the artificial landscape index such as urban construction land had a significant positive correlation with the annual growth rate of surface runoff. On the contrary
there was a negative correlation of the annual growth rate of surface runoff and the change rate of natural landscape index such as cultivated land and water area. ③ With the help of urban ecological corridors and ecological nodes
the waterlogging prevention and control ecosystem was constructed
and the areas with high concentration of urban impervious surface were split
the urban green infrastructure was added
and the waterlogging prevention and control landscape pattern of source emission reduction was constructed. [Conclusion] Landscape pattern changes had a significant impact on the change of surface runoff
and the optimization of landscape pattern can effectively promote the urban benign water cycle and slow down the occurrence of waterlogging.
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