Journal of Geo-information Science >
Assessing the Importance of Water Conservation Function in Wuhan City Circle
Received date: 2013-10-30
Revised date: 2013-12-10
Online published: 2014-03-10
In this paper, we analyzed the influence of city development on the regional water conservation function in Wuhan City Circle. Taking the factors of vegetation, meteorology, terrain, soil and man-made into account, we respectively selected vegetation cover, precipitation, evaporation, slope, slope length, soil thickness and coverage types as the assessment indicators of water conservation function importance. Based on a combination of the expert judgment matrix and AHP, the index system was built. Furthermore, we applied RS and GIS spatial analysis technology to analyze the dynamic change and the spatial distribution of each factor importance on the water conservation function, and then comprehensively assessed the function importance. The results showed that the intensity of the water conservation function importance increased first and then decreased from 2000 to 2009 in Wuhan City Circle, the area of the most important water conservation function increased from 9283 to 16 131 km2, but then reduced to 11 258 km2, the area of the general important water conservation function increased dramatically, especially from 2005 to 2009 it grew by 1.1 times. The Northeast of the city circle and in the Southeast of the hilly areas were much more important, and the factor of human activities that caused the changes in vegetation cover and coverage types played an important role on the water conservation function in short time. Recently, lots of unreasonable activities, such as deforestation, grass destruction, and farming around the lake turned out. Because of a significant reduction in water area, forest and grass owning to urban expension, the water conservation function changed. The main reason why the water conservation function declined between 2005 and 2009 in Wuhan City Circle was that human being explored land irrationally which directly made a reduction in vegetation cover, and in areas of lakes and wetlands.
BAI Yang, CHU Dong, TIAN Liang, FENG Yu, ZHANG Zhe . Assessing the Importance of Water Conservation Function in Wuhan City Circle[J]. Journal of Geo-information Science, 2014 , 16(2) : 233 -241 . DOI: 10.3724/SP.J.1047.2014.00233
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