There is a great uncertainty in generation and formation of non-point source(NPS)pollutants,which leads to difficulties in the investigation of monitoring and control.However,accurate calculation of these pollutant lo...There is a great uncertainty in generation and formation of non-point source(NPS)pollutants,which leads to difficulties in the investigation of monitoring and control.However,accurate calculation of these pollutant loads is closely correlated to control NPS pollutants in agriculture.In addition,the relationships between pollutant load and human activity and physiographic factor remain elusive.In this study,a modified model with the whole process of agricultural NPS pollutant migration was established by introducing factors including rainfall driving,terrain impact,runoff index,leaching index and landscape intercept index for the load calculation.Partial least squares path modeling was applied to explore the interactions between these factors.The simulation results indicated that the average total nitrogen(TN)load intensity was 0.57 t km-2 and the average total phosphorus(TP)load intensity was 0.01 t km-2in Chengdu Plain.The critical effects identified in this study could provide useful guidance to NPS pollution control.These findings further our understanding of the NPS pollution control in agriculture and the formulation of sustainable preventive measures.展开更多
Since the construction of the Three Gorges Dam, the Poyang Lake hydrological characteristics obviously changed. During the impoundment period of the Three Gorges Reservoir, the hydrodynamic factors of Poyang Lake vari...Since the construction of the Three Gorges Dam, the Poyang Lake hydrological characteristics obviously changed. During the impoundment period of the Three Gorges Reservoir, the hydrodynamic factors of Poyang Lake varied. Water level dropped, the velocity decreased and water exchange time lengthened, which changed the release of phosphorous from sediments. In order to investigate how the hydrodynamic factors influence the release of phosphorous from sediments, we used a two-way annular flume device to simulate the release characteristics of phosphorous from sediments under variable water levels and velocities. We found that both water level rising and velocity increasing could enhance the distur- bance intensity to sediments, which caused the increase of suspended solids （SS） concentration, total phosphorus （TP） concentration in the overlying water, and the ability that phosphorus released to overlying water from sediments enhanced as well： when overlying water velocity maintained 0.3 m/s, SS concentration increased to 4035.85 mg/L at the water level 25 cm which was about 25 times compared to the minimum value and TP concentration in the overlying water also reached the maximum value at the water level 25 cm which was 1.2 times that of the value at 10 cm; when water level maintained 15 cm, SS concentration increased to 4363.35 mg/L at the velocity of 0.5 m/s which was about 28 times compared to the value of 0 m/s, and TP concentration in the overlying water increased from 0.11 mg/L to 0.44 mg/L. When the water level maintained 15 cm, the phosphorous release rate reached the maximum value of 4,86 mg/（md） at 0.4 m/s. The concentration of total dissolved phosphorous （TDP） and soluble reactive phosphate （SRP） both in overlying water and sediment-water interface were negatively correlated with pH. Using the parabolic equation, the optimum water level at a velocity of 0.3 m/s was calculated to be 0.57 cm, and the optimum velocity at water level of 15 cm was found to be 0.2 m/s.展开更多
基金Key Research and Development Program of Hubei Province,No.2020BCA073Independent Innovation Research Program of Changjiang Institute of Survey,Planning,Design and Research Co.,Ltd.,No.CX2019Z05。
文摘There is a great uncertainty in generation and formation of non-point source(NPS)pollutants,which leads to difficulties in the investigation of monitoring and control.However,accurate calculation of these pollutant loads is closely correlated to control NPS pollutants in agriculture.In addition,the relationships between pollutant load and human activity and physiographic factor remain elusive.In this study,a modified model with the whole process of agricultural NPS pollutant migration was established by introducing factors including rainfall driving,terrain impact,runoff index,leaching index and landscape intercept index for the load calculation.Partial least squares path modeling was applied to explore the interactions between these factors.The simulation results indicated that the average total nitrogen(TN)load intensity was 0.57 t km-2 and the average total phosphorus(TP)load intensity was 0.01 t km-2in Chengdu Plain.The critical effects identified in this study could provide useful guidance to NPS pollution control.These findings further our understanding of the NPS pollution control in agriculture and the formulation of sustainable preventive measures.
基金National Key Project for Basic Research,No.2012CB417004
文摘Since the construction of the Three Gorges Dam, the Poyang Lake hydrological characteristics obviously changed. During the impoundment period of the Three Gorges Reservoir, the hydrodynamic factors of Poyang Lake varied. Water level dropped, the velocity decreased and water exchange time lengthened, which changed the release of phosphorous from sediments. In order to investigate how the hydrodynamic factors influence the release of phosphorous from sediments, we used a two-way annular flume device to simulate the release characteristics of phosphorous from sediments under variable water levels and velocities. We found that both water level rising and velocity increasing could enhance the distur- bance intensity to sediments, which caused the increase of suspended solids （SS） concentration, total phosphorus （TP） concentration in the overlying water, and the ability that phosphorus released to overlying water from sediments enhanced as well： when overlying water velocity maintained 0.3 m/s, SS concentration increased to 4035.85 mg/L at the water level 25 cm which was about 25 times compared to the minimum value and TP concentration in the overlying water also reached the maximum value at the water level 25 cm which was 1.2 times that of the value at 10 cm; when water level maintained 15 cm, SS concentration increased to 4363.35 mg/L at the velocity of 0.5 m/s which was about 28 times compared to the value of 0 m/s, and TP concentration in the overlying water increased from 0.11 mg/L to 0.44 mg/L. When the water level maintained 15 cm, the phosphorous release rate reached the maximum value of 4,86 mg/（md） at 0.4 m/s. The concentration of total dissolved phosphorous （TDP） and soluble reactive phosphate （SRP） both in overlying water and sediment-water interface were negatively correlated with pH. Using the parabolic equation, the optimum water level at a velocity of 0.3 m/s was calculated to be 0.57 cm, and the optimum velocity at water level of 15 cm was found to be 0.2 m/s.
