本文指出，在研究细颗粒浑水的流动变形及群体沉降等基本特性时，对于微小浓度的浑水，应考虑包围颗粒的结合水薄膜体积的影响；对于高浓度浑水，应进一步考虑颗粒碰撞接触形成孔隙的髟响。根据上述观点，导得高浓度浑水粘滞性公式、非絮凝群体沉速公式及极大浓度公式。文中还得到高浓度粗颊粒浑水群体沉速经验公式。应用各方面试验资料验证各种公式，获得较好的结果。

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.

对H.A.爱因斯坦等国内外数10种不同形式和结构的泥沙启动条件进行分析研究，统一转化为无因此起动切力 θc=γc/(νc-ν)d 的形式，并分析计算出无粘性均匀沙的 θc 值。一般来讲， 是界于0.0231～0.0716之间的一个常数值。从分析结果可看出各种公式之间的差别，为使用选择公式提供了科学的依据。

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。

进入天然水体的大部分污染物会在河流、湖泊底部形成富含各种污染物的沉积物层,在一定的水流流速及紊动作用下发生底泥冲刷及再悬浮。大量的污染物被重新释放出来造成河湖水体的二次污染,这种情况是外源污染得到治理后影响水质的主要因素。建立这种影响条件下的水质模型需要对沉积物的污染释放机理有充分的认识。采用富含污染物的天然河湖底泥,通过衡温静态培养等手段,在不同的水力条件,瞬间悬浮、连续悬浮和静止状态下,研究了污染物的释放,并对实验结果进行了分析。确定了底泥冲刷悬浮影响水质的主要途径,即在底泥间隙水污染物浓度接近平衡时,其与上层大水体的混合作用是影响水质的主要作用,其次是下部底泥的静态释放,而悬浮颗粒的污染物扩散释放作用则较小,这为底泥冲刷悬浮影响下的水质模型的建立提供了理论依据。

本文根据苏州水网的特点，采用模拟试验和现场实测相结合、系统分解和综合相结合的方法，对水体中的CBOD、SOD、DO及NH4+-N等主要水质参数的变化规律和影响因素，进行了定量的研究，所得的结果为水污染的综合防治提供了科学依据。

Unsteady Water quality model with multiparameter for the river network has been studied in this paper. The model reflects the characteristics of the unsteady flow with different direction and that of the unsteady water quality under aerobic, anoxic and anaerobic conditions. The model includes the various equations for DO, COD, BOD5, NBOD, NH4+-N.All parameters in the model have been obtained by the research for the observation on the field and the experiment in the laboratory. An equation of longitudinal dispersion coefficient has also been developed. Appling the computing method of dynamic coupling, the model has been verified by the data observed on field. The model has been applied to the program for controlling water quantity and water quality in order to improve the water quality of the river network of Wuxi city in China.

本文针对平原河网地区，河道纵横交错、水流流向顺逆不定、水流中输送的物质浓度属非稳态非均匀变化等特点，推导得到了使用与各种流动情况下，求解河网对对流输移问题隐式差分方程的一套计算公式，及相应的河网计算方法。运用这一方法进行述职求解，不仅能反映上述各种特点，还具有所需的计算机内存少，计算速度快，易于掌握点击应用方便等优点。