After the Tianjin Port 8.12 explosion, an enormous amount of potassium dichromate （K2Cr2O7） and butanone （CH3COCH2CH3） leaked into the coastal soil-groundwater system, which potentially threatened the environment ...After the Tianjin Port 8.12 explosion, an enormous amount of potassium dichromate （K2Cr2O7） and butanone （CH3COCH2CH3） leaked into the coastal soil-groundwater system, which potentially threatened the environment and human health. Determining the transport process of hazards is necessary to establish guidelines for remediating the contaminated area. This work aims to investigate the migration of potassium dichromate and butanone in the coastal soil-groundwater system through a coupling unsaturated-saturated numerical model, incorporating the HYDRUS model into the MODFLOW/ MT3D model. In the unsaturated zone, two-dimensional HYDRUS model was applied, and its recharge flux at the bottom boundary was utilized as the input of MODFLOW/MT3D model in the saturated zone. Results showed that Cr2O^（2-）7 migrated much faster than butanone in the unsaturated zone and reached the water table in about 1 year. In comparison, butanone was unlikely to enter the aquifer even 5 years later with a migration depth of about 2.2 m. Driven by groundwater, the Cr2O^（2-）7 that entered the aquifer migrated about 161 m toward southeast 5 years later. In the saturated zone, the contamination plume covered mainly the southeast area due to the groundwater flow direction.展开更多
Under the guidance of Deng Xiao-ping’s strategic think-ing of openning to the outside world, the structure of om-nibearing openness has basically taken shape in China. Follow-
In order to explore the applicability of SBAS-InSAR technology to the deformation monitoring in coastal reclamation areas,this paper,based on 28 Sentinel-1A images,uses SBAS-InSAR technology to obtain the surface defo...In order to explore the applicability of SBAS-InSAR technology to the deformation monitoring in coastal reclamation areas,this paper,based on 28 Sentinel-1A images,uses SBAS-InSAR technology to obtain the surface deformation information of the Tianjin Port reclamation area from January 2018 to November 2019,which reveals the characteristics of surface deformation in the land reclamation area of Tianjin Port and analyzes the relationship between the subsidence rate and reclamation time and land use type.The results show that the land reclamation area of Tianjin Port has the characteristics of a wide range of subsidence rate,uneven settlement and multiple settlement funnels.The subsidence rate ranges from-74.9 to19.7mm/a and it is inversely proportional to the land reclamation time.The subsidence rate of the early reclamation area is smaller,while that of the newly reclamation area is higher.The subsidence rate varies greatly among different land use types.This study verifies the feasibility of SBAS-InSAR Technology in the deformation monitoring of reclamation areas,and provides ideas for the monitoring and analysis of land subsidence in coastal areas such as coastal zones,islands and tidal flat.展开更多
基金supported by the National Natural Science Foundation of China(No.21656001)
文摘After the Tianjin Port 8.12 explosion, an enormous amount of potassium dichromate （K2Cr2O7） and butanone （CH3COCH2CH3） leaked into the coastal soil-groundwater system, which potentially threatened the environment and human health. Determining the transport process of hazards is necessary to establish guidelines for remediating the contaminated area. This work aims to investigate the migration of potassium dichromate and butanone in the coastal soil-groundwater system through a coupling unsaturated-saturated numerical model, incorporating the HYDRUS model into the MODFLOW/ MT3D model. In the unsaturated zone, two-dimensional HYDRUS model was applied, and its recharge flux at the bottom boundary was utilized as the input of MODFLOW/MT3D model in the saturated zone. Results showed that Cr2O^（2-）7 migrated much faster than butanone in the unsaturated zone and reached the water table in about 1 year. In comparison, butanone was unlikely to enter the aquifer even 5 years later with a migration depth of about 2.2 m. Driven by groundwater, the Cr2O^（2-）7 that entered the aquifer migrated about 161 m toward southeast 5 years later. In the saturated zone, the contamination plume covered mainly the southeast area due to the groundwater flow direction.
文摘Under the guidance of Deng Xiao-ping’s strategic think-ing of openning to the outside world, the structure of om-nibearing openness has basically taken shape in China. Follow-
文摘In order to explore the applicability of SBAS-InSAR technology to the deformation monitoring in coastal reclamation areas,this paper,based on 28 Sentinel-1A images,uses SBAS-InSAR technology to obtain the surface deformation information of the Tianjin Port reclamation area from January 2018 to November 2019,which reveals the characteristics of surface deformation in the land reclamation area of Tianjin Port and analyzes the relationship between the subsidence rate and reclamation time and land use type.The results show that the land reclamation area of Tianjin Port has the characteristics of a wide range of subsidence rate,uneven settlement and multiple settlement funnels.The subsidence rate ranges from-74.9 to19.7mm/a and it is inversely proportional to the land reclamation time.The subsidence rate of the early reclamation area is smaller,while that of the newly reclamation area is higher.The subsidence rate varies greatly among different land use types.This study verifies the feasibility of SBAS-InSAR Technology in the deformation monitoring of reclamation areas,and provides ideas for the monitoring and analysis of land subsidence in coastal areas such as coastal zones,islands and tidal flat.
