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Modelling of Human Activity

Scientists develop new land surface model including multiple processes and human activities.

Human activities, such as urban planning, irrigation and agricultural fertilization, can affect terrestrial carbon, nitrogen and water cycle processes and aquatic ecosystems.

Some human activities lead to water stress, ecological environment damage, including groundwater lateral flow, and the movement of frost and thaw fronts. These changes in turn alter energy balance and water budget, and affect weather, climate and environment.

“We need a new land surface model to describe these processes,” said Professor Xie Zhenghui from the Institute of Atmospheric Physics (IAP) of the Chinese Academy of Sciences. “A comprehensive land surface model can not only provide a platform for water-energy simulations, but also contribute to water resources management, environment protection and sustainable development.” Professor Xie added.

Professor Xie and his team incorporated the schemes of groundwater lateral flow, human water use, soil freeze-thaw front dynamics, riverine nitrogen transport, and urban planning into a land surface model, and thus developed a land surface model known as CAS-LSM. According to Professor Xie, the current version has improved the descriptions of biogeochemical process and urban modules, compared with the earlier version of this model.

“The new developed model can be applied to the simulation of inland river basins in arid areas to quantitatively evaluate the ecohydrological effects of stream water transfer,” said Professor Xie.

“Combined with basin simulation and climate system models, CAS-LSM can monitor river water environment. It can also help quantitatively evaluate weather and climate effects of South-to-North water transfer and provide advice for urban planning.” [APBN]