Presenter: Miss. Jiang Xintong, China Water Resources Pearl River Planning survey and Design Co. LTD
Sub-theme
1. Water-Human-Economy(Agriculture, Industry, City...)-Ecology Nexus under a Changing Environment
Topic
1-4. Water security challenges in key regions
Body
The Guangdong-Hong Kong-Macao Greater Bay Area is one of the regions with the highest degree of openness and the strongest economic vitality, and it holds an important strategic position in the overall development of the country. Water as an important support and link for the Great Bay Area, it is of great significance to analyze the water security and challenges in Great Bay Area. Based on RS and GIS technology and multi factor comprehensive discrimination method, multi-source remote sensing data, LUCC data, DEM data and MODIS13Q1 data were used in this paper to research the spatio-temporal evolution of soil erosion areas, the vegetation coverage, the land use transfer and the water surface ratio in Great Bay Area during the past 20 years. The results show that the soil and water loss has effectively improved in Great Bay Area and its area has significantly reduced in recent 20 years. The main factor for the improvement of soil and water loss in GBA is the increase of vegetation coverage. The water area of the Great Bay Area has been decreased by 136 km², and the water surface ratio has been decreased from 4.48% to 4.22%. Making a transition matrix analysis of land use type in Great Bay Area, the results show that the area of cultivated land and grassland has been significantly reduced, while the area of building land has been significantly increased which can conclude that most land use types are transferred to building land. The main reason why the water area is decreased is that the increasing in construction land invades the original water area. The results of this study reveal the challenges of water security in the Greater Bay Area, which can provide a theoretical basis for the implementation of water security and a reference meaning for promoting the construction of ecological civilization in the Great Bay Area.