Abstract
The change of spatial and temporal distribution of precipitation has an important impact on urban water security. The effect of land cover land use change (LCLUC) on the spatial and temporal distribution of precipitation needs to be further studied. In this study, transfer matrix, standard deviation ellipse and spatial autocorrelation analysis techniques were used. Based on the data of land cover land use and precipitation, this paper analyzed the land cover land use change and its influence on the spatial and temporal distribution pattern of precipitation in the Guangdong–Hong Kong–Macao Greater Bay Area (GBA). The results showed that from 2001 to 2019, the area of cropland, water, barren, forest/grassland in the GBA decreased by 44.03%, 8.05%, 50.22%, 0.43%, respectively, and the area of construction land increased by 20.05%. The precipitation in the GBA was mainly concentrated in spring and summer, and the precipitation in spring tended to increase gradually, while the precipitation in summer tended to decrease gradually, while the precipitation in autumn and winter has no obvious change. It was found that with the change of land cover land use, the spatial distribution of precipitation also changed. Especially in the areas where the change of construction land was concentrated, the spatial distribution of precipitation changed most obviously.
Highlights
The change of the spatial and temporal distribution of precipitation has an important impact on urban water security, and it is of great significance to discuss the change trend of precipitation center in the future to guarantee urban water security [1]
It has been showed that the temporal and spatial variation of precipitation was affected by many factors, among which land cover land use change (LCLUC) was an important influencing factor [2,3]
Compared with 2001, in 2019, the area of cropland in the Greater Bay Area (GBA) decreased by 44.03%, the area of water area decreased by 8.05%, the area of barren decreased by 50.22%, the area of forest/grassland decreased by 0.43% and the area of construction land increased by 20.05%
Summary
The change of the spatial and temporal distribution of precipitation has an important impact on urban water security, and it is of great significance to discuss the change trend of precipitation center in the future to guarantee urban water security [1]. It has been showed that the temporal and spatial variation of precipitation was affected by many factors, among which land cover land use change (LCLUC) was an important influencing factor [2,3]. The impact of LCLUC on climate, especially precipitation, cannot be ignored. Many studies have been done on the impact of LCLUC [2,4], including temperature, circulation, carbon emissions, runoff–sediment [5], and other aspects [6,7,8]. Some scholars have studied the effects of climate and LCLUC on water security in watersheds [1], while few studies focus on the impact of LCLUC on precipitation
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