translate Chinese into English 水资源是维持生命体生存和社会可持续发展不可或缺的重要资源水资源可包括蓝水和绿水。蓝水是储存在河流、湖泊、含水层和水库中的地表水和地下水可以提取供人类使用绿水是指来自降水的非径流部分它短暂地储存在土壤中最后通过蒸发和蒸腾作用回到大气中。气候变化加剧了陆气交互过程的时空变异性人类活动则通过改变下垫面覆被状况改变了水文循环过程和能量收支过程加

Water resources are an essential resource for sustaining the survival of living organisms and promoting the sustainable development of society. Water resources can include blue water and green water. Blue water refers to surface and groundwater stored in rivers, lakes, aquifers, and reservoirs that can be extracted for human use. Green water refers to the non-runoff portion of precipitation, which is temporarily stored in soil and eventually returns to the atmosphere through evaporation and transpiration. Climate change has intensified the spatiotemporal variability of land-atmosphere interactions, while human activities have altered the hydrological cycle and energy balance processes by changing the underlying surface cover, exacerbating the uneven spatial distribution of water and thermal resources in the basin, and causing significant changes in the distribution of blue and green water throughout the year. The Dongjiang River Basin is an important water source for the core cities of the Guangdong-Hong Kong-Macao Greater Bay Area, including Huizhou, Dongguan, Shenzhen, and Hong Kong. Analyzing the response of blue and green water resources in the Dongjiang River Basin to climate and land use change is of great significance. Therefore, this paper comprehensively analyzes the spatiotemporal evolution characteristics of blue and green water resources in the Dongjiang River Basin under the background of climate and land cover change by constructing a SWAT (Soil Water Assessment Tool) model applicable to the Dongjiang River Basin research area. Combined with the shortage of blue and green water and the per capita available water resources, the water security of the basin is evaluated, and the response mechanisms of blue and green water changes and precipitation-blue and green water distribution to climate, land use, and vegetation component changes are discussed. The impact of climate change and land use on blue and green water is quantitatively evaluated, and future predictions of land use, climate, and blue and green water changes in the basin are made. The main research results obtained are as follows: