研究了感潮河网的水环境容量。研究表明影响感潮河网水环境容量的主要因素为: 潮汐作用、调蓄库容、水利工程的调控运行、污染物的降解系数和边界引水水质。基于感潮河网水质模型, 完善了其水环境容量的计算方法。以上海市浦南东片河网为例,分析了感潮河网水环境容量在上述因素影响下的时空变化规律,并提出了相应条件下的污染物日允许排放量。

着重研究了河流中点源及线源污染物的垂向紊动混合过程。根据大江河中污染物在排放口近区范围内的垂向紊动混合过程, 提出了部分均匀混合水深的新概念, 建立了点源及线源的垂向紊动混合过程基本方程。通过求解方程, 得到部分均匀混合水深随纵向距离变化的基本规律和全水深垂向均匀混合距离的理论公式, 且用相关实测资料进行了验证。将所建立的垂向紊动混合过程基本规律引入数值模型中, 建立了部分均匀混合水深平均二维水质模型, 并用现场罗丹明示踪实测资料进行验证, 表明该模型较传统的全水深平均模型在近区具有更高的计算精度, 与三维模型相比则有更高的计算效率

It has been discovered through experiment that the slurries at Huayuankou on the Yellow River, Lianyuangang, Dmgang, Yangtze River estuary, Dunkerque of France, etc. all behave as the Bingham fluid with thixotropic properties as the sediment concentration is large. Consequently, the setting velocity of a sphere, the maximum diameter of non-setting sphere and the shear stress of incipient motion of cohesive sediment in the slurry change significantly with the duration of rest after the slurry is strongly agitated, Based on the above fact, the quantitative relationship between the shear stress of incipient motion of cohesive sediment and the factors of the sediment concentration, the particle size, the yield stress measured by the viscometer and the duration of rest after agitation(consolidation time), etc, has been developed, and good results have been obtained, The condition of incipient motion of non-cohesive sediment obtained by various investigators have also been transformed to the dimensionless critical shear stress θ. It is found that the various values of θ, in general, come between Einstein’s 0.0715 and Shamofu’s (Шамов) 0.0245.

The thixotropy properties and the motion law of a sphere in the Bingham fluid have studied. Through observation of the setting motion of a single sphere in the Bingham fluid on the X-ray screen, it has been discovered that the mud in estuaries and along sea bay, and the hyperconcentrated flow all behave as the Bingham fluid with thixotropy properties as the large sediment concentration. Through derivation, the theoretical relationship between the yield stress and non-setting maximum sphere supported by the stress for the Bingham fluid has been developed, the equations for calculating the increasing yield stress and the non-setting maximum sphere diameter with the duration at rest of the slurry have been obstained. In consideration of the effect thixotropy on the fluid motion. The Navier-Stokes equation group for the Bingham thixotropy fluid has been developed. Through future study of the flow boundary condition of setting motion of a single sphere in the Bingham thixotropy fluid. And the solving of the Navier-Stokes equation group under the small Reynolds number. The theorecital equation of the drag force of the Bingham thixotropy fluid flowing around a sphere has been deduced. The theorecital relationship between drag coefficient and Revnolds number has been derived. By use of the experimental data of rheological test of various slurries measured with viscometer and those of single sohere motion observed on the X-ray screen, the above equation have been verified. The equations are in good agreement with the experimental data for various slurries.

河流底泥中含有大量的污染物质，是对水质影响的不可忽视的重要污染源。本文将环境水力学、泥沙运动学及水化学相结合进行研究，从水流中污染物的对流扩散方程出发，通过理论推导得到包括有底泥冲刷及沉降、底泥释放等因素影响的水质基本方程，通过实验确定方程中的有关因素，用实测资料验证，取得较好的结果，并付诸应用。