Five diagnostic experiments with a 3D baroclinic hydrodynamic and sediment transport model ECOMSED in couple with the third generation wave model SWAN and the Grant-Madsen bottom boundary layer model driven by the mon...Five diagnostic experiments with a 3D baroclinic hydrodynamic and sediment transport model ECOMSED in couple with the third generation wave model SWAN and the Grant-Madsen bottom boundary layer model driven by the monthly sediment load of the Yellow River, were conducted to separately diagnose effects of different hydrodynamic factors on transport of suspended sediment discharged from the Yellow River in the Bohai Sea. Both transport and spatio-temporal distribution of suspended sediment concentration in the Bohai Sea were numerially simulated. It could be from the Yellow River cannot be delivered in concluded that suspended sediment discharged long distance under the condition of tidal current. Almost all of sediments from the Yellow River are deposited outside the delta under the condition of wind-driven current, and only very small of them are transported faraway. On the basis of wind forcing, sediments from the Yellow River are mainly transported north-northwestward, and others which are first delivered to the Laizhou Bay are continuously moved northward. An obvious 3D structure characteristic of sediment transport is produced in the wind-driven and tide-induced residual circulation condition. Transport patterns at all layers are generally consistent with circulation structure, but there is apparent deviation between the depth-averaged sediment flux and the circulation structure. The phase of temporal variation of sediment concentration is consistent with that of the bottom shear stress, both of which are proved to have a ten-day cycle in wave and current condition.展开更多
A series of experiments were conducted about the effects of different CO_2 concentrations and ventilating time on cotton using OPT-1 open top chambers.The results show that.for all the ventilating treatments,the devel...A series of experiments were conducted about the effects of different CO_2 concentrations and ventilating time on cotton using OPT-1 open top chambers.The results show that.for all the ventilating treatments,the development stages of cotton were advanced,plant height increased,the biomass of root and stalk increased when CO_2 concentration increased: the number of bolls formed in summer was more than 85% of the total for the treatment of 700 ppm CO_2 concentration; single boll weight,the number of bolls per plant,ginned and unginned cotton weights,and stalk weight increased obviously when CO_2 concentration increased,but the influences of CO_2 enrichment on the ratio of ginned weight to the total weight of ginned and unginned cotton,fibre length and ginned weight of 100-seed were small.展开更多
基金National Natural Science Foundation of China, No.40771030 No.40571020
文摘Five diagnostic experiments with a 3D baroclinic hydrodynamic and sediment transport model ECOMSED in couple with the third generation wave model SWAN and the Grant-Madsen bottom boundary layer model driven by the monthly sediment load of the Yellow River, were conducted to separately diagnose effects of different hydrodynamic factors on transport of suspended sediment discharged from the Yellow River in the Bohai Sea. Both transport and spatio-temporal distribution of suspended sediment concentration in the Bohai Sea were numerially simulated. It could be from the Yellow River cannot be delivered in concluded that suspended sediment discharged long distance under the condition of tidal current. Almost all of sediments from the Yellow River are deposited outside the delta under the condition of wind-driven current, and only very small of them are transported faraway. On the basis of wind forcing, sediments from the Yellow River are mainly transported north-northwestward, and others which are first delivered to the Laizhou Bay are continuously moved northward. An obvious 3D structure characteristic of sediment transport is produced in the wind-driven and tide-induced residual circulation condition. Transport patterns at all layers are generally consistent with circulation structure, but there is apparent deviation between the depth-averaged sediment flux and the circulation structure. The phase of temporal variation of sediment concentration is consistent with that of the bottom shear stress, both of which are proved to have a ten-day cycle in wave and current condition.
文摘A series of experiments were conducted about the effects of different CO_2 concentrations and ventilating time on cotton using OPT-1 open top chambers.The results show that.for all the ventilating treatments,the development stages of cotton were advanced,plant height increased,the biomass of root and stalk increased when CO_2 concentration increased: the number of bolls formed in summer was more than 85% of the total for the treatment of 700 ppm CO_2 concentration; single boll weight,the number of bolls per plant,ginned and unginned cotton weights,and stalk weight increased obviously when CO_2 concentration increased,but the influences of CO_2 enrichment on the ratio of ginned weight to the total weight of ginned and unginned cotton,fibre length and ginned weight of 100-seed were small.
