نشریه مهندسی آب
سال دهم شماره 4 (زمستان 1401)

In this study, the quantitative zoning is used to identify areas suitable for artificial recharge in the mountainous area of Gohar and Garbayegan plain, Fars province fitting a linear fundamental form to the surface. The structures with grade two for triplex windows and the data from the digital elevation model with a resolution of 10 m was used to determine the best fitable fundamental structure. The sum of square differences of the surface differences is used as an indicator to determine the degree of fitting the fundamental structures. By fitting the interpretable patterns to the Earth's surface it can be determined that the earth was similar to what pattern and formation mechanism. Mountain ranges upstream alluvial cones and plains located downstream of the upstream alluvial cones are not linear levels. Places which are not at the acceptable slope (gradient less than 0.002 and higher than 0.1) allocated to the zero fitting degrees and the fitting degree values are positive in alluvial cones and areas fall in the acceptable range of the slope. The results show that the surfaces located downstream of the alluvial cones and the plains are most suitable areas for floodwater spreading in the Garbayegan watershedIn this study, the quantitative zoning is used to identify areas suitable for artificial recharge in the mountainous area of Gohar and Garbayegan plain, Fars province fitting a linear fundamental form to the surface. The structures with grade two for triplex windows and the data from the digital elevation model with a resolu.

In this paper, river regime equations through developing of unit stream power equation and based on data of babolrood River were derived. For this purpose, with the review of previous research, the principles and concepts of regime and hydraulic geometry of the river is mentioned. then, methods and out-comes of former researchers are classified. On the next step, based on dimensional analysis, unit stream power as a function of river flow parameters including suspended sediment load and specific gravity of particles is developed. Using the unit stream power equation and babolrood River' data, regime equations are derived for these rivers. Finally, the results derived from regime equations are compared with the field data and regime equations of the other researchers. A good agreement was observed between field data and values resulted from developed regime equations in this research.

Agricultural activities are the largest sector of water consumption in the world and in Iran. Due to the scarcity of water resources, to prevent the reduction of crop production, the use of unconventional water resources, including agricultural drains in the irrigation cycle can be a significant help to eliminate Lack of water resources. The purpose of this study is to evaluate the use of the system (IFDM) to conserve water resources and prevent environmental degradation in agriculture. Aghili village of Gotvand city, due to having good water and soil, is a suitable bed for the annual production of more than thousands of tons of grain and non-grain products, but unfortunately in this plain we see the production of a huge amount of wastewater. In this study, the values of pH, temperature, DO, BOD, TDS, TSS, EC, sodium, phosphate, nitrate, in a period of five years (95-90) in river water and in the drainage of this plain are analyzed. Took. Based on the obtained results, the quality of drainage is desirable and it can be used in the irrigation cycle mixed with canal water to irrigate salinity-resistant crops such as wheat, autumn barley and summer cotton.

Temperature, Salinity and salinity are as some of physical properties of sea water often varying there. Thermocline, is a property as temperature varying in water column and having variations in terms of time and space. Study and investigation of existence and developing trend with seasonal variations conduct the researcher to some information about inter fluid events. Numerical methods having errors and approximations, and predicted values will be closer to real ones that it is related to more knowledge about influence of present forces and effective factors on the problem.Therefore, little errors happens in numerical study. Of course it is helpful to predict results for different time periods in suitable time and so compete them with measured values for evaluation of the results in the case study zone. Running a numerical model, Princeton, during a 6 months period from winter using measured values of temperature, and applying initial and boundary conditions, also effective factors on physical conditions variations in the zone, summer temperatures are resulted and so formation and development of thermocline will be analyzed. In fact, development of thermocline from strait of Hormuz to Northwest of the Persian Gulf (Arvand river estuary) has been investigated.

From demand perspective, water is an essential and irreplaceable commodity in the household basket and production intermediate demand in the economic sectors. In economics, the price of a commodity depends on the final demand for it but this issue is not the same for water due to its low price. All the economic sectors are dependent on water and no sector can operate and offer services without it. Water is in close contact with environment. The economy based on recirculating of water and use of sewage effluent in the manufacturing sector leads to decrease in usage of underground water. This paper uses the statistics of water accounting and based on the input-output tables, calculates the incremental coefficient of sewage effluent, surface water, underground water, Water abstraction from the sea, and usage of water in industrial units in different sectors of economy and predicts the amount of water consumption based on the national economic growth and population growth for the year 1410.

Estimation of the sediment loads in a stream flow is one of the well-discussed topics in the sediment hydraulics literature. In almost the entire river engineering projects addressing issues such as river morphology, river bed changes, estimation of the annual sediment deposition at the river intakes, banks protection, dredging of the water channels, etc are of prime importance. The amount of sediment transported through a river cross-section may be under a mix of various influences from flow depths and widths, energy slope, temperature and fluid characteristics, flow turbulence and a wide range of their sizes, forms, densities, sediment particle concentrations, and other physical and hydraulic properties. The variety of formulae applied in sediment transport and estimation calculations also the paucity of information and data on the performance of such formulae makes the selection of the suitable ones for different specific conditions an extremely difficult task. Any choice in this regard should incorporate the evaluation and analysis of river hydraulics. In the present paper, several sediment estimation formulae examined for Greater Karun River along Mollasani-Farsiat reach with the purpose of proposing the best sediment transport relation to be applied in later researches. Results showed flow-based energy-based methods are better suited for the Karoon River.