Abstract
ABSTRACTLakes are important to the healthy functioning of the urban ecosystem. The urban lakes in Wuhan, China, which is known as ‘city of hundreds of lakes’, are facing substantial threats mainly due to rapid urbanization. This paper focused on detecting the spatial and temporal change of urban lakes in Wuhan, using a long time series of Landsat and HJ-1A remotely sensed data from 1987 to 2016. The permanent disappearance and seasonal fluctuation of 28 main urban lakes were analysed, and their relationships with climatic change and human activities were discussed. The results show that most lakes in Wuhan had shrunk over the past 30 years resulting in a permanent change from water to land. The shrinkage was also most apparent in the central region of the city. Seasonal fluctuations of lake area were evident for most lakes but the relative important driving variable of lake area change varied between sub-periods of time for different lakes. The explanatory power of impervious surface to five-year permanent water change is 91.75%, suggesting that urbanization – as increasing impervious surface – had led to the shrinkage of urban lakes in Wuhan. In all, 128.28 km2 five-year permanent water disappeared from 1987 to 2016.
Highlights
Lakes are a precious natural resource and play an important role in the healthy functioning of ecosystems
This paper aims to analyse the spatio-temporal change of urban lakes in Wuhan using a long time series remotely sensed images from 1987 to 2016
The change of climatic factors and human activity from 1987 to 2016, as shown in Figure 8, were used to analyse the factors that may be driving the changes in the urban lakes of Wuhan city
Summary
Lakes are a precious natural resource and play an important role in the healthy functioning of ecosystems. Due to the effects of climatic change and human activities, lakes across the world are under threat, evident notably in relation degradation of quality and areal shrinkage (Du, Ottens, and Sliuzas 2010). China, is known as “city of hundreds of lakes” (Wang et al 2017), many lakes in the city have shrunk or disappeared in the past decades (Kai et al 2010; Yang and Ke 2015). These latter changes impact the sustainable development of Wuhan city and concerns such as public health. Exploring the spatial and temporal dynamics of urban lakes is important to urban ecology and environment, which is becoming a great challenge for future development in the city
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