List of articles (by subject) Geohydrology
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Open Access Article
1 - Evaluation of Electrical Resistivity Tomography and Electromagnetic with Very Low Frequency Method in Identifying Buried Karst in Shaho Rifts (The Case of Quri Qaleh Cave)
Ronak Shokati Amjad maleki Farzad ShirzaditabarKarst and karst cavities are one of the most challenging subjects. Given that karst areas cover approximately 20% of the land area, Identifying and investigating the location of karst buried cavities can be useful in various usages such as tourism development, subsidenc MoreKarst and karst cavities are one of the most challenging subjects. Given that karst areas cover approximately 20% of the land area, Identifying and investigating the location of karst buried cavities can be useful in various usages such as tourism development, subsidence prevention and karst water resources. In the rifts of Shaho, located in Kermanshah province, karst landforms, including caves and buried cavities, are well stretched. The current study attempted to identify rapid and early karst cavities using an easy and low-cost method in geomorphological studies. To this end, in Shaho rifts (Quri Qaleh cave and its surroundings), two geophysical methods namely Electrical Resistivity Tomography (ERT) and Very Low Frequency Electromagnetism (VLF) were utilized and compared. Initially, by determining the location of the cave on the ground, the profile performing route was designed perpendicular to the cave route. Then, 5 profiles were performed by VLF and 4 profiles by ERT method. Four ERT profiles perpendicular to profiles 2, 4 and 5 of VLF were taken and finally the results of the two methods were compared. In addition to determining the exact location of the cave, the results of both methods revealed anomalies outside the cave. Other findings of the research include the possibility of rapidly achieving the results and the cheaper use of the VLF method compared to other identification methods. Manuscript profile -
Open Access Article
2 - Regional modeling of relationship between sediment yield and vegetation cover in Sabalan mountain catchments
Sayyad Asghari saraskanroud Mahdi Jadidoleslami ghalehnoThe knowledge about spatial relationships of vegetation with sediment yield (S.Y) in watersheds is essential for optimal controlling and managing of water and soil resources. The purpose of this study was to recognize and determine the relationship between vegetation co MoreThe knowledge about spatial relationships of vegetation with sediment yield (S.Y) in watersheds is essential for optimal controlling and managing of water and soil resources. The purpose of this study was to recognize and determine the relationship between vegetation cover and annual S.Y of Sabalan catchments, N.W Iran. In this regard, the possibility of presentation of regional S.Y estimation models based on correlation and regression analysis were considered. Independent variables include average, minimum and maximum NDVI (Normalized Differential Vegetation Index), extracted through the processing of Landsa.t 8 satellite imagery in the ENVI environment. The dependent variable, which was the annual S.Y, was obtained through calculations on sediment load data of 10 sample hydrometric stations. Results of correlation test showed that there was a strong and significant relationship between the average NDVI and the annual S.Y in the catchments (r = -0/758). This inverse relationship emphasizes the importance and apparent role of vegetation in reducing sediment production and transporting in the region. Moreover, the results of regression tests showed that is possible to present the regional estimation models regards to annual S.Y by fitting linear, quadratic and power functions. In this regard, the quadratic model has the highest performance and explain 75% of the annual S.Y variance. The linear relationship was also able to explain 57% of the annual sedimentary variance. Manuscript profile -
Open Access Article
3 - Investigating spatial and temporal changes in the quality of underground water sources in the Izadkhash basin
Maryam Ansari ایرج جباریThe increase in the world's population, the effects of climate change and lifestyle changes have put increasing pressure on water resources and have led to widespread water stress in many countries. An effective way to reduce and control the continuous degradation of gr MoreThe increase in the world's population, the effects of climate change and lifestyle changes have put increasing pressure on water resources and have led to widespread water stress in many countries. An effective way to reduce and control the continuous degradation of groundwater quality is to understand spatial and temporal changes and identify the main sources of pollution. In this research, using the geostatistical method, temporal and spatial changes in the underground water resources of Izadkhasht basin were investigated in a period of 11 years, considering the factors of water quality change. In this regard, different interpolation methods were compared, and the kriging method with exponential variogram showed better results for water quality parameters. The results of these analyzes showed that the most important factors in the salinity of water and soil resources in the region are destructive formations in the basin. So that in the quality maps of water resources, all parameters showed an increase in three points. Manuscript profile -
Open Access Article
4 - Revealing the process of hydrological changes in Armand river basin
Daryosh Saeidi Amir Gandomkar Masoud NasiriThe phenomenon of climate change is considered one of the most important challenges of this century, and in a way, the dimensions of its effects are trans-regional and have overshadowed the earth's ecosystem. Among these effects, we can mention the process of hydrologic MoreThe phenomenon of climate change is considered one of the most important challenges of this century, and in a way, the dimensions of its effects are trans-regional and have overshadowed the earth's ecosystem. Among these effects, we can mention the process of hydrological changes in rivers. The area studied in this research is the Armand river basin in Chaharmahal and Bakhtiari province. The data used were obtained from the information of 4 hydrometric stations located in the study area in a statistical period of 35 years (1986-2020). The method used in this research is Kendall's statistical and graphic test. The results of investigating the trend and changes of runoff in Armand basin hydrometric stations (including Armand, Beheshtabad, Koh Sokhte, and Korebas) indicate the existence of a significant decrease in annual runoff, and in the seasons of winter, spring, summer, and fall. On the other hand, the comparison of the average discharge changes in different seasons showed that the summer season had the most decreasing changes in runoff compared to other seasons. The results of this research also showed that the average annual discharge of the entire basin during the statistical period was equal to 29.3 cubic meters per second. The average minimum and maximum annual discharge of the basin during the same period was recorded as 0.7 and 84.785 cubic meters per second, respectively. Armand station with an average of 137.7 cubic meters per second in the spring season has the highest flow rate, and in the same season Koh Sokhteh station has the lowest flow rate among hydrometric stations in the basin with 6.74 cubic meters per second. Manuscript profile