Impact Of Ecological Land Use Consumption On Urban Waterlogging Disaster In Wuhan City

With the further acceleration of urbanization,the scale of urban construction land has increased dramatically,encroaching on a large number of natural forest land,grassland,waters and unused land,causing damage to urban ecology and deterioration of water environment have also intensified.As a highly concentrated gathering place for wealth and population,the city has a huge disaster loss.On the basis of summarizing the laws of ecological land consumption in the process of urbanization,this paper demonstrates the temporal and spatial response of flood disasters to ecological land use loss,and studies the impact of urban ecological land consumption on urban flooding disasters in the context of rapid urbanization.Influencing mechanisms to propose countermeasures for reducing disaster losses and mitigating disaster risks.On the theoretical level,this study can summarize and enrich the theoretical study of ecological land use and flood disasters,accumulate theoretical foundation for urban ecological civilization construction and flood disaster prevention,and on the other hand supplement and improve the study of urban human-land relationship.The practical significance is that the research results can provide strong suggestions for the construction of ecological civilization and flood control in Wuhan,and will provide useful reference for the development of new cities in central China and the safety and sustainable development of global cities.Based on the research on the mechanism of ecological land consumption and flood disasters,this paper collects and analyzes a large number of documents and works,summarizes the theories of geography,resources and environmental science,and disaster science,and the damage of urban ecological land use to flood disasters.The mechanism was explored.Through the interpretation of the two remote sensing images of July 9 and July 23 in the period of the large-scale flood disaster in 2016,the water distribution during the flood disaster was obtained by GIS,and the waterlogging area was separated,and the period from 2000 to 2015 The internal ecological land consumption area is compared and superimposed to visualize the urban ecological land consumption and the spatial response of the flooding area.Finally,the relationship between the impact of ecological land use and waterlogging disasters during the study period in Wuhan was analyzed and discussed.Conclusion:(1)Urbanization causes the loss of ecological land,and the loss has certain characteristics in terms of scale,space and structural changes.From 2000 to 2015,the ecological land in Wuhan was depleted,and the loss was: the total area of ecological land decreased by 48,504.46hm2,and the proportion of ecological land in the total area of Wuhan decreased by 6%.During the period,the total area of ecological land used The amount of transfer is 120991.97hm2.The consumption characteristics of ecological land are:(1)From the perspective of the types of ecological land consumption,water,forest,grassland and unused land have experienced different degrees of wear and tear.Among them,the water consumption is the most significant,followed by forest land,grassland and unused land.(2)From the perspective of ecological land use loss transfer path,there are 20 ways to consume ecological land,which can be summarized into two categories: one is the transfer between ecological land types,and the other is the transfer of ecological land to nonecological land.(3)From the spatial pattern of ecological land consumption,the consumption of ecological land in the central urban area is the most significant,which is significantly higher than the ecological land consumption in the surrounding urban area.The closer the surrounding urban area is to the central urban area,the more serious the ecological land consumption is,and the main depletion path is expressed as construction land.(2)The flood disasters in Wuhan respond to the urban ecological land consumption in time and space.From 2005 to 2016,the waterlogging disaster in Wuhan showed the timing characteristics of the frequency of occurrence,and the disaster was severe.During the continuous heavy rainfall in Wuhan from June 30 th to July 6th,the city was affected by waterlogging disasters.The waterlogging showed two characteristics in space: First,the waterlogging situation in the relatively high terrain was lighter than the terrain.The low area;the second is that the waterlogging mainly occurs in the periphery of the lake and the buildings adjacent to the lake.(3)The ecological land consumption and urban waterlogging disasters in Wuhan have certain response and coupling relationship in time and space.First,in terms of time series,the area of ecological land use in Wuhan has a negative correlation with urban waterlogging disasters.As time goes by,the number of occurrences of ecological land use in Wuhan will decrease during the same period.Second,in terms of space,the ecological land consumption in Wuhan has a good coupling relationship with urban waterlogging disasters.The area of ecological land consumption in Wuhan and the surrounding areas of these areas have a certain degree of waterlogging disasters,especially the type of waters at the beginning of the study period.The area where the ecological land is transferred to the construction land is particularly serious.(4)Urban ecological land consumption has a devastating impact on urban flooding disasters.First,the scale of ecological land consumption,the reduction of water,forestry and grassland totals weaken the city's ability to carry and regulate stormwater;Second,the transfer of ecological land consumption path,resulting in a sharp increase in urban construction land,to a certain extent Increasing the urban microclimate,expanding the urban imperviousness,and increasing the risk of urban disasters.