فهرست مطالب سید محمدهادی مشکاتی

Experimental investigation of embankment dams due to overtopping breach is a remarkable subject because it is the most possible failure reason, and it includes a complicated process. The mentioned phenomenon physical modeling has performed at energy ministry water research institute, hydraulics laboratory, and its hydraulic outputs compared with a benchmark model outcome in three scenarios framework. The results reveal that the breach process of physical models comprises three stages: i.e., initiation, development, and the end. Also, the development time is longer than that of the other stages. In first scenario, when shell gradation  varied from 0.5mm to 1.7mm, 26 percent of peak discharge increased and 14 percent of breach time decreased. In second scenario in which lake water level maintained at overtopping threshold for two hours (for more saturation), 15 percent of peak discharge and 14 percent of breach time declined. In third scenario where the primary breach groove did not excavate, the highest difference in comparison with benchmark model results occurred, when 34 percent of peak discharge grew and 24 percent of breach time reduced. Moreover, asymmetrical sedimentation pattern happened in the last scenario. The Calculation of eroded material volume and mass was sedimentation pattern determination harvest. Herein, the simultaneous measurements of breach geometry, flow hydrograph, and final sedimentation pattern are the research unique achievements. However, further acquired analysis would be influential for the embankment dam's failure phenomenon management.

In this study, the quantitative effects of the construction of Seymareh Dam in the Karst site of this structure on the fluctuations of groundwater level and discharge of springs have been investigated. According to 10-year measurements, it was found that there is a direct hydraulic relationship between the water surface of the dam reservoir and the water level of observation wells. The results revealed that a significant difference in the amount of water level of the North Edge wells compared to the South Edge wells, especially in the right abutment and the right abutment wells compared to the left abutment can be clearly seen, respectively, the evidence and confirmation of an Asmari core with Low permeability is along the axis of the anticline and also more efficiency of the sealing curtain on the right side is another reason for this difference. Changes in the total discharge of the total springs measured on both banks (right and left) have a similar trend to the changes in the discharge of the left bank springs, which is due to the more discharge of the left abutment springs. The results showed that with increasing the water level of the reservoir to 660 meters, the amount of discharge of springs in the region reached 1400 liters per second and with decreasing the level of reservoir water in the next year this amount decreased and again with increasing level to 704 meters, the amount of discharge to 1800 Liters per second has increased.

Construction of dams as an abnormal structure in the riverbed, although it is considered as a management and planning tool, but its lack of management and quantitative and qualitative monitoring can lead to environmental problems. Seymareh Dam in Karkheh catchment was flooded in 2011 with the aim of generating hydropower, increasing the regulation power of downstream dams and flood control. According to the water processes in the dam water resources network and quantitative and qualitative evaluation of the role of dewatering, quantitative and qualitative sampling was performed before and after the construction of the dam over a period of 10 years. The study of qualitative results showed that the role of geological formations, especially Gachsaran and Asmari formations is effective in increasing the concentration of solutes and dissolution and the left bank springs have more qualitative changes due to the greater thickness and volume of Gachsaran and Asmari formations. On the other hand, the correlation between reservoir water level during dewatering and quality parameters showed that dam reservoir dewatering had the greatest impact on the right bank springs and had more correlation in changes. The results of qualitative analysis in Seymareh river also showed that the anomaly in the quality parameters of R4 station due to two factors of rainfall in spring and the addition of water leaving the power plant has been effective in changing water quality.

Designing and promoting innovative methods with up-to-date and localized technical solutions can be helpful in efficient management of the wastewater treatment industry and achievement of sustainable development. Despite this, prevailing laws and policies are sometimes ineffective or do not support the desired results. Therefore, the preparation of an upstream strategic document by taking into account the opportunities and challenges, particularly in the field of wastewater treatment technology development, can identify gaps and take measures to resolve them in order to refer the necessary measures to the relevant agencies. In this research, in addition to the future studies on the development of wastewater treatment technologies, vision and quantitative indicators for the next twenty years were determined. Accordingly, the opinions of 58 managers of the country's water and wastewater department, industry experts and university professors were used through the meetings of the technical and steering committee. The basis for formulating the actions and policies required in this research is the Technological Innovation System (TIS) based on components for the development, dissemination and exploitation of technology. In this research, while enumerating the challenges of the development of wastewater technology in the country, the relevant policies have been explained.

In this research, a three-dimensional numerical model has been developed to simulate the flow pattern at lateral intake in 180-degree bend. Due to the curvature of flow boundaries and computational grid, the three-dimensional Navier-Stokes equations are solved in nonorthogonal and nonstaggered curvilinear coordinates, and given the complexity of the flow conditions, the k-ω model for low Reynolds numbers is used to solve turbulence terms. The equations are discretised by the finite volume method and the central difference and power law algorithm are used to discretise the diffusion and convection terms, and the stable semi-implicit (SIMPLEC) is used to couple the flow and pressure field. Also, to increase the efficiency of the model, one block with variable domain has been used to simulate both channels (main and intake). The developed model was first validated in two tests of flow in 180-degree bend and the lateral intake in a straight flume. Then flow pattern at the lateral intake in 180-degree bend for 45-degree diversion angle in the establishment angle of 40-degree was simulated and compared with the available laboratory data. The average modeling error in the main channel and intake was about 7.3% and 19.7%, respectively, which is acceptable compared to the results of other commercial models.

In this paper, using a 3D numerical model, the flow pattern at lateral intake was simulated. A three-dimensional finite volume model with standard  was developed to solve turbulence equations. In order to simulate the main and diversion channels, only one block with varied domain arrays was used. The Reynolds-Averaged Navier-Stokes (RANS) equations are solved in a curvilinear non-orthogonal coordinate system with collocated grid. Pressure correction algorithm of SIMPLE and convection schemes of Power Law are applied to the model. In addition, for velocity-pressure coupling; the Rhie and Chow method were used. Experimental data obtained from laboratory study is utilized to verify the model computations. The flow pattern at lateral intake with one-block numerical method was modeled. The numerically modeled results show acceptable agreement with the measured data and demonstrate the capability of the developed numerical model.