| With the acceleration of China's urbanization process,the rapid development of the social and economic level and the high-intensity intervention of human activities on nature have led to the expansion of the urban construction land area,which has led to the uneven distribution of green space and the pressure of urban rain and flood,a series of ecological issues.Therefore,in-depth research on urban landscape patterns and surface runoff is crucial for urban planning.Comprehensive exploration of the spatial and temporal evolution of landscape pattern and surface output runoff under the influence of land use/land cover change is conducive to the sustainable development of urban planning.This paper takes Zhengzhou City as the research object,and uses the DEM image data of Zhengzhou City in 1995,2002,2009,2013 and 2017 and the Landsat series of remote sensing image data products with 30 m spatial resolution,and uses Arcgis software to carry out Zhengzhou City land use classification,is mainly divided into four types of land for construction,farmland,green space and water.The spatial and temporal evolution of land use change in Zhengzhou City is analyzed.The landscape pattern index is calculated by Fragstats software,and the landscape pattern of different periods is quantitatively analyzed to explore Zhengzhou City's development trend of landscape pattern;using SWMM model to analyze the runoff characteristics,simulate the impact of the change of impervious land area on surface runoff in Zhengzhou City during the past 20 years under the same rainfall conditions,sum up the expansion of urban construction land area to Zhengzhou city surface runoff Impact.The results show:(1)Zhengzhou City's construction land in 1995-2017 tends to be centered on the main city of Zhengzhou,expanding to the surrounding areas,and connecting with Xingyang City,Xinzheng City,Gongyi City,Dengfeng City,Xinmi City and Zhongmu County.In 2017,the main urban area of Zhengzhou city center has been basically integrated with the surrounding counties and cities,and the area has shown a continuous growth trend;the green land is mainly concentrated in the southwestern part of Zhengzhou City,the area shows a trend of decreasing first,then increasing and then decreasing again;the farmland land is gradually expanded from the northeastplain area to the southwest hilly mountain area,and the area is basically increased first and then decreased trend;the water body is mainly concentrated in the northern Yellow River,the city river and the reservoir,and the area ratio is the smallest,the basic change is not big.(2)At the level of landscape type,the fragmentation degree of construction land,farmland land and green land increased from 1995 to 2017,and the landscape pattern changed from natural landscape to artificial landscape,and artificial landscape gradually became the dominant landscape type.At the landscape level,the types of landscape patches are reduced,the landscape types are gradually connected into pieces,the degree of landscape connectivity is increased,and the degree of spread is increased,reflecting the trend of spatial pattern of landscape pattern diversification.(3)In 1995-2017,the area ratio of impervious water increased greatly.Under the condition of certain rainfall conditions,the surface runoff and the impervious area ratio showed obvious positive correlation.The ratio of surface runoff and green land area to construction land area and water body land.There is a significant negative correlation between the area and the area ratio of construction land,that is,as the area of green land and the area of water use are reduced,the surface runoff is larger.The positive correlation between surface runoff and construction land LPI,ED,CA and PLAND showed a significant negative correlation with green space land CA and a significant positive correlation with farmland land PLAND.(4)Through the analysis of land use,landscape pattern and surface runoff variation characteristics of Zhengzhou City from 1995 to 2017,it is possible to deeply grasp the evolution law,maintain and improve regional ecological dynamic balance,and realize the sustainable development of land resources in Zhengzhou City.And the use of important and far-reaching significance provides theoretical and technical support for the compilation of Zhengzhou urban planning. |
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