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The source of water supply in Nanchang City is relatively single, and the safety of urban water supply is difficult to guarantee. According to the hydrogeological conditions of the study area, a threedimensional visualization numerical model of groundwater system was established. After the model identification and verification, combined with the target of emergency water supply in Nanchang city, the emergency exploitation of groundwater in Youkou emergency water source was simulated by using the model under different emergency exploitation schemes, respectively. The prediction results show that compared with scheme I and scheme II, scheme III is most suitable for the requirements of well layout, which has the advantages with the minimum drawdown of groundwater level, and the maximum exploitation. For scheme III, under the conditions that the dewatered aquifers are no more than 1/2 and 2/3 of the original aquifer, the emergency exploitation of 36.55×104m3/d and 49.45×104m3/d can be provided, which could meet the emergency water demands of 54.9% and 74.3% of the local residents, respectively.

The ingestion of heavy metals in agricultural soils by the population has implications for human health. The research demonstrate that the concentration of Cd in the soil exceeded the national background level, with 62% of soil samples surpassing the Chinese soil screening value. Furthermore, 42% of the analyzed rice grains exhibited Cd levels that surpassed the established standard. Notably, there was no significant association between the concentration of Cd in soil and rice. The bio-effectiveness of heavy metals was enhanced in soils with low pH, and residue state was the main storage form for heavy metals. Cd exhibited a different distribution pattern compared to other heavy metals. Human health risk assessment revealed that children in the study area were at greater risk, particularly due to non-carcinogenic and carcinogenic effects of Cd. These findings provide valuable insights for the development of strategies to remediate heavy metal contamination in similar areas.. [ABSTRACT FROM AUTHOR]

Water resources and water environmental issues have emerged as significant constraints on the socio-economic development of Wuxi City. Based on the mechanism of mutual feedback within this system, a coupled model of the social-economy-water resources-water environmental was developed by means of spatial system dynamics. Subsequently, this model was employed to study the spatiotemporal dynamic characteristics of water resources and water environment carrying capacities in each subregion of Wuxi, considering various climate and socio-economic development scenarios. The results show that: (1) Both water resources carrying capacity coefficients and water environmental carrying capacity coefficients of each administrative district display in following order under different scenarios: Binhu District> Xishan District > Huishan District> Xinwu District> Liangxi District. (2) There are distinctions of water resources carrying capacity and water environment carrying capacity under different settings. Compared with B3 scenario (a developing society in a dry climate), the monthly average values of water resources carrying capacity coefficients and water environmental carrying capacity coefficients in Liangxi District, Binhu District, Xishan District, Huishan District, and Xinwu District under CI scenario (a water saving and emission reduction society in a wet climate) are 2.23 and 2.36, 2.13 and 3.22, 2.13 and 2.55, 2.12 and 2.53, 1.58 and 1.74 times, respectively. The practice shows that the spatial system dynamics model effectively harmonizes the relations between social economy and resource environment in both time and space, modelling simulation results that closely align with actual conditions. Thus, it provides a robust scientific foundation for regional water resource management in similar areas. [ABSTRACT FROM AUTHOR]