JOURNAL OF ENVIRONMENT AND WATER ENGINEERING
Year:2020 | Volume:6 | Issue:3|Papers Count:10

One of the problems of controlling erosion in catchment areas is the lack of statistical data to accurately estimate the amount of sedimentation and erosion. In order to implement soil protection programs and determine methods to reduce sedimentation, it is necessary to estimate the total volume of annual sediment production. The purpose of this study was to estimate the erosion intensity and sedimentation rate of Babolroud catchment located in Mazandaran province with an area of 962 km2 and the variety of topography, lithology and vegetation using MPSIAC empirical model and to determine the accuracy of this model using Arc-GIS. In this method, the role of 9 factors affecting soil erosion were evaluated and depending on the severity and weakness of each factor, a score is attributed to it. Finally, considering the sum of the scores obtained for different factors, the sedimentation rate of the catchment was estimated. The results showed that, Babolroud catchment area with sedimentation rate of 166. 469 m3/km2. y is located on the low zone of sedimentation. One of the causes is the presence of dense pastures and calcareous formations and rocks with medium to high hardness in most areas. Moreover, according to the results, the highest amount of erosion is in the northern part of the catchment. In order to evaluate the accuracy of the results obtained from the experimental model, the observed information of the two sedimentation stations was used and the results indicate a relative average difference of 21% in the MPSIAC model.

Jajarm Plain in the province of North Khorasan is located, in terms of structural zoning, in the north of the central desert basin and in the south of the Alborz mountain range. The aim of this study was to investigate the factors influencing the evolutionary process of groundwater resources and hydrogeochemical characteristics of water resources of Jajarm plain. To achieve this goal, 20 water samples were taken from the plain wells and physical parameters such as pH, TDS, EC, and salinity were measured in situ using multimeter. In addition, the chemical properties of the surface water entering the plain were also evaluated. The hydrogeochemical analysis was carried out in the laboratory through induction plasma method, the statistical analysis and modeling were performed in Chemistry and AqQA software environment. According to the Piper chart, most of the groundwater in this plain was a part of the sodic and chloride type facies, and in some examples, the sodic facies and the sulfate type. Chemical analysis of water entering the aquifer of Jajarm plain showed that the sources of ions entering the plain of Jajarm were affected by the lithology of rocks and sediments that were exposed to weathering for a long time; hence, as the plain waters, due to the passage of the detrital evaporation formations of the third period (marl, salt gypsum, and marl limestone formation), have dissolved them and increased the ratio of Cl+ SO4> HCO. The results showed that the presence of rocks and minerals of carbonate (calcite), sulfate (gypsum) and silicate (tuff and detrital igneous rock) in the water passage has caused the scenarios of Ca>CO3 and Ca+Mg>CO3. Based on the calculations, it was found that the evolutionary trend of water samples in this plain, if not properly managed, will lead to the formation of SO₄ >Mg ratio, which will probably lead to the formation of sodium carbonates and halites in the future, and also eventually rising EC and the emergence of saline in the Jajarm plain in the future.

Land subsidence occurs more slowly and gradually in comparison with other natural hazards, such as floods and earthquakes; therefore, it has received much less attention from human communities. However, the subsidence over time causes irreparable damage to the structure of underground aquifers, vital infrastructure such as roads, power lines, and urban structures. In this study, in order to monitor land subsidence in Chahardoli and Qorveh plains located in Hamadan and Kurdistan Provinces, the method of Permanent Scatterer (PS) was used using 59 images of Sentinel satellite in ascending passage and 58 images in descending passage. According to the average displacement of PSs in the region between Hassan Abad Emam and Ahutapeh villages of Asadabad city located in Chahardoli plain of Hamadan Province, displacement in the form of subsidence for Ahutapeh and Hassan Abad Emam villages respectively about-170 and-166 mm was happened in the time period of 2017-2018. Moreover, the research found that the subsidence in the northern part of Chahardoli plain in Hamadan Province is much more than the subsidence in the southern part of Chahardoli plain in Kurdistan Province. In order to find the cause of subsidence, the approach of examining the information of piezometric wells in the region and their changes over time was used. In this regard, it can be concluded that the land subsidence in Qorveh plain and Chahardoli plain of Hamadan and Kurdistan provinces can be attributed to the uncontrolled extraction of groundwater resources.

Hydro-suction is an appropriate and economical method for dredging deposited sediment at reservoirs. In this study, a physical model was made and some experiments were designed to analyze the ranges of blockage depth in different hydraulic conditions. In the model, 80 tests were conducted using three diameters (d), three water heads (H) and different diving depths of pipe inlet (Z) from the sediment level to the blockage depth. In general, the results indicated that the more increase in the diving depth, the higher hydro-suction efficiency. In some of the experiments, a vortex flow was observed under the pipe inlet. The results indicated that the formed vortex flow have a positive effect on the hydro-suction efficiency. The results associated to the blockage depth approved that hydro-suction systems with larger pipe diameter and more water head have a greater blockage depth (Zb). The Froude number (Fr) analysis indicated that an increase in Fr would cause increment efficiency and blockage depth of hydro-suction system. Subject to a constant pipe diameter, the results revealed that increasing the H/d ratio equal to 66. 66 and 133. 33%, would enhance the Zb/d ratio equal to 58. 89 and 112. 22%, respectively.

Water is a vital substance for human and water supply has become a crisis in many arid countries. Due to arid and semi-arid climate of Iran, it has many challenges to supply fresh water. According to the urgent need for water and also the lack of water resources, it is a nessessity to implement the water management programs like recycle and reuse of runoffs in order to meet the water needs in agriculture and green space. Nowadays, use of concrete porous pavements in urban paths is increased significantly, and it can be used to reduce water pollution. Due to the usefulness of different adsorbents in reducing pollution, in this study the effect of replacing pumice, scria, zeolite and travertine adsorbents with volume percentages of 25, 50, 75 and 100% and metal sulfide nanoparticles with 1, 2, 3 and 4% with porous concrete aggregates on qualitative parameters in runoff have been investigated by Taguchi method. Experiments related to physical properties were performed in the concrete technology laboratory as well as tests related to qualitative parameters in the chemistry laboratory. In this study, three parameters of additive, volume percentage of additive and metal sulfide nanoparticles have been used. Finally, using Minitab and Excel software, the parameters and the effect of each of them in reducing pollution were investigated. The results showed that the greatest impact on reduction of pollution was the percentage of additive, type of additive and volume of nanoparticles, respectively. Finally, as a proposed concrete mix design that has the highest effect on pollution elimination, 75% of the volume fraction and 1% of the nanoparticle can be introduced.

Since 90% of the water required for various uses in Iran is supplied from groundwater sources, qualitative evaluation of this vital resource is of great importance. The aim of this study was to evaluate the quality of groundwater resources in Razan watershed of Hamedan using MI and PoS indices based on the content of Zn, Pb, Cd, and Cu during spring and summer of 2020. For this purpose, in the middle of spring and summer, 120 groundwater samples were randomly collected from 20 stations and the parameters of pH, EC and temperature were measured in situ. The content of the elements in the samples was read using induction coupled plasma emission spectrometer after the laboratory preparation process. The mean concentrations of Zn, Pb, Cd, and Cu in the samples in spring were 36. 3, 7. 87, 0. 340 and 38. 2 μ g/l, respectively; In summer it was 38. 3, 8. 80, 0. 430, and 42. 4 μ g/l, respectively, and in both seasons it was less than the maximum tolerance of WHO and the Department of Environment of Iran for drinking and irrigation of agricultural products. On the other hand, the mean values of MI and PoS indices in spring with 0. 920 and 0. 360 respectively indicated a clean quality level and minimum pollution and in summer with 1. 05 and 0. 410 respectively indicated low and mimimum pollution level. Therefore, although at the time of the study, the groundwater resources of the Razan watershed were not exposed to excess pollution to heavy metals, but by the indiscriminate use of agricultural inputs, especially potassium sulfate fertilizers, triple superphosphate, and chemical poisons containing heavy metals by farmers, the possibility of increasing the concentration of heavy metals in the soil and their penetration into groundwater aquifers will not be unexpected in the medium term.

Rivers are recognized as the most important water supply resources in various sectors, including agriculture water, drinking water, and industrial water. Over recent years, however, urban, industrial, and agricultural sewage have mostly been discharged into rivers. Taking into account that rivers have a limited capacity for toleration of pollutants, river water quality assessment is indispensable. In the present study, three water quality indicators namely the National Sanitation Foundation Water Quality Index (NSFWQI), River Pollution Index (RPI), and Weighted Arithmetic Water Quality Index (WAWQI) were used to assess the quality of Garmarood River water. Sampling was performed at 3 stations along the river during summer and winter of 2019. A variety of parameters namely DO, temperature, BOD, fecal coliform, turbidity, TSS, pH, NH3-N, and phosphate were measured to calculate NSFWQI and RPI indices. The parameters used to measure WAWQI, included TS, NO3-, chloride, total hardness, SO42-, Mg, turbidity, pH, and Ca. The results obtained from analysis of the above-mentioned parameters showed that the value of NSFWQI, RPI, and WAWQI indices fall within the 50. 66-75. 6, 2. 25-5. 5 and 48. 33-55. 92 ranges. The results obtained from all 3 indices are indicative of relatively high quality of water at station 1 and poor quality of water at stations 2 and 3.

Promoting water productivity in food production is one of the main issues in different countries of the world, especially in low-water countries like Iran. In the present situation, measurement and analysis of productivity indices of scarce water input in agricultural sector in Iran is of special importance due to the quantitative and qualitative limitation of this valuable material. Therefore, the purpose of the present study is to measure and compare the physical and economic productivity of irrigation water use in two traditional and modern irrigation systems for major crops (Wheat, Barley, Rapeseed, Alfalfa and Forage Corn) in Shahriar. In this study, the CPD, BPD and NBPD were used to calculate of agricultural water productivity. According to the results of the study, in both irrigation systems, the priority of crop cultivation to the second rank is based on CPD index Forage Corn and Alfalfa, respectively. Also based on both BPD and NBPD indices in modern irrigation system are Rapeseed and Wheat respectively and in traditional irrigation system Rapeseed and Alfalfa, respectively.

The Soil and Water Assessment Model (SWAT) is a continuous and semi-distributed model. The SWAT model is capable of being connected to the Geographic Information System (GIS). Using a range of information such as basin physical information (soil, land use and slope) as well as meteorological information such as rainfall, temperature, wind, relative humidity and solar radiation, this model can monitor hydrological processes in catchments on a daily time scale., Monthly and yearly. Simulation of hydrological processes in watersheds is essential for predicting future events in those basins and identifying ways to deal with them. In this study, using SWAT hydrological model, the runoff outflow of Santeh hydrometric station in the watershed of Lake Urmia in Kurdistan province in Iran with an area of 5306 km2. Runoff simulation was performed over a seven-year statistical period 2007-2013. The first five years of this period 2007-2011 for model calibration using 21 different parameters and the final two years of 2011 and 2012 for validation using two statistical indices (NSE) and coefficient of determination (R2). it placed. According to the simulated hydrograph and the monthly runoff observations, the calculated statistical indices of SWAT model in the calibration period and in the monthly time scale validation period have acceptable results in the runoff simulation, with coefficient values (NSE) and (R2) in the calibration period were 0. 78 and 0. 82 respectively and for the validation period 0. 9 and 0. 91 respectively.

In recent years, with the growth of cities and the consequent increase in urban population, environmental crises in societies, including Iran, have increased. Therefore, more attention should be paid in order to reduce environmental risks, the importance of environmental knowledge and literacy of people, especially women. Based on this, the present survey evaluated and assessed the environmental knowledge of women in Boroujerd in the winter of 2019. The statistical population, 15231 people, of the study included all housewives living in Boroujerd city of Lorestan Province. The statistical sample size using Cochran's formula was 385 people. The sampling method was cluster sampling and data were collected based on a standard questionnaire. SPSS software version 16 was also used to analyze the data. The main hypothesis of the research regarding the relationship between environmental knowledge and awareness with environmental behaviors of housewives was confirmed. The results showed that the environmental behaviors of about half of the housewives in this city were moderate.