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Journal Extension and Development of  Watershed Managment
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Journal Extension and Development of  Watershed Managment

Extension and Development of  Watershed Managment

The latest Published Issue
 Volume9،Number33 ،Successive33
 
1
Assessment the impact of Maroon dam on Jarahi river regime
( 18 Visit ) ( 7 Download )  Abstract And Keywords
Publication Information : Volume 9 - Number 33 - Successive Number 33
Auhtors :
Abstract : Dams, as massive hydraulic structures, widely affect the flow of rivers downstream. Assessment of the extent of this impact is one of the most important issues in flood control research. In the present study, the annual and flooding trends of the Jarahi River and the relationship of these changes with the establishment of Maroon Dam was investigated. For this purpose, the diagrams of annual average discharges and flood peak discharges in two hydrometric stations of Idnak (upstream of the dam) and Behbahan (downstream of the dam) were plotted and a pairwise t-test (in SPSS software) was used to analyze the difference. The maximum flow discharge of Jarahi River was used in a period of 17 years before and after the operation of Maroon Dam. The results show the effect of Maroon Dam on peak flood discharges; In the 17-year period after the date of the opening of the Maroon Dam, the peak flood discharges in the downstream station of the dam compared to the 33-year period before that, have decreased significantly (88.9% decrease after Since the opening of the dam). The average maximum flow rate in the two mentioned periods before and after the construction of the dam is 1757.9 and 194 cubic meters per second, respectively, which indicates that the Maroon Dam has restrained the flood peaks. The statistical test also shows that no significant difference between the maximum flood discharge before and after the opening of Maroon Dam is observed in the hydrometric station upstream of the dam; however, at the downstream hydrometric station, a significant difference of 1% is observed between the maximum flood discharges before and after the opening of the Maroon Dam. Also the average annual discharges were coincided in a decreasing trend, given the trends in the two upstream and downstream of the dam, which can be attributed to drought occurrence and climate change.
Area of Expertise : Water resources management, Flood, Khoozestan

2
Evaluation of vegetation valuation and economic functions and estimation of damages caused by construction operations in the country's watersheds (Case Study: Kermanshah province)
( 25 Visit ) ( 1 Download )  Abstract And Keywords
Publication Information : Volume 9 - Number 33 - Successive Number 33
Auhtors :
Abstract : Forest and rangeland cover is important in a watershed as a life-giving system. Also, forest and rangeland cover has multiple functions and capabilities that can affect the survival, improvement, and modification of other living systems in a watershed. In the present study, to evaluate and economic functions of forest and rangeland cover in Kermanshah province, all required statistics and information were collected in the field and by compiling a questionnaire. Data reliability was assessed using the Likert method and Cronbach's alpha coefficient. Also, based on studies and maps of ecological areas of the province, other information has been collected, reviewed, and evaluated. Then, effective factors in the destruction of forest and rangeland cover in the watersheds of the province were obtained. The results of functions and economic evaluation of forest and rangeland cover are presented separately and in the form of calculation tables including the real economic value of the country's forests and rangelands by global figures. The results of this study provide comprehensive information for determining damages and valuation for managers and experts of the forests, rangelands, and watershed management organization and official experts of the judiciary.
Area of Expertise : Assessment points, Cronbach's alpha, Economic value, Likert Rangeland cover, Soil erosion, Vegetation function.

3
Comparing the efficiency of evidential belief function and weight of evidence models for groundwater potential mapping
( 27 Visit ) ( 2 Download )  Abstract And Keywords
Publication Information : Volume 9 - Number 33 - Successive Number 33
Auhtors :
Abstract : The purpose of the current study is comparing the efficiency of evidential belief function and weight of evidence models to delineate the groundwater potential area of Bushehr plain in Bushehr province. First, location of wells were collected. Then, 70% of the wells were used randomly for modeling, and the remaining 30% for model evaluation. Using effective factors, the groundwater potential map was drawn by performing the efficiency of the evidential belief function and Weight of evidence models t in 10.1ArcGIS software. Finally, the resulting groundwater potential maps were validated using ROC. The results showed that the area under the ROC curve in the model of evidential belief function is 80% and in the model of Weight of evidence is 86%. Comparison of these results showed that both models have acceptable accuracy, but the Weight of evidence has a relatively better performance and the resulting map is more accurate than the evidential belief function model. The results of this research can be helpful for future management of water resources.
Area of Expertise : Groundwater, evidential belief function, weight of evidence, Bushehr plain.

4
Long-term trend analysis and the relationship between Meteorological and hydrological series (Case study: Ilam Dam Watershed)
( 39 Visit ) ( 9 Download )  Abstract And Keywords
Publication Information : Volume 9 - Number 33 - Successive Number 33
Auhtors :
Abstract : Rainfall and discharge are the most important climatic and hydrological parameters, the prediction of their behavior is of special importance for water resources management. In this study, the trend of precipitation parameters, maximum, minimum and average temperature and flow over a period of 30 years in Ilam meteorological station and Gol-Gol hydrometric station evaluated. Mann-Kendall and Sen's slope estimator tests were used to determine the trend and Pettitt test was used to determine the change point. To investigate the relationship between discharge and precipitation, SPI and SDI drought indices were calculated and then their relationship in 6 time periods of 3, 6, 9, 12, 24 and 48 months was determined by Pearson correlation method. The results showed that the rainfall trend increased in some months and decreased in others. The average temperature trend and the maximum temperature trend are upward in most months, but the minimum average temperature trend is often downward. Discharge trends are declining in most months. The results of Pearson correlation coefficient showed that there is a significant correlation between SPI and SDI drought indices. According to the results of Pettitt test, the time of change of variables is in the early 80's and the change point in the discharge time series is more than precipitation, which shows that along with climatic factors, human factors have been effective in the discharge rate of the basin.
Area of Expertise : Pettitt test, Man-Kendall test, Sen's slope estimator, SPI Index, Pearson Correlation.

5
Investigating the Role of Rangeland Species in the protection of marl formations from erosion in Ardakan – Yazd
( 34 Visit ) ( 6 Download )  Abstract And Keywords
Publication Information : Volume 9 - Number 33 - Successive Number 33
Auhtors :
Abstract : In some marl outcrops, certain rangeland species grow dramatically, stabilizing soil and controlling erosion and erosion. The purpose of this study was to investigate the role of rangeland species on marine erosion control of desert regions of Ardakan city of Yazd. For this purpose, after separation of marl zones on geological map and field visits, marl boundaries were finalized on the map. Then, a map of percentage of vegetation species and type was prepared. Field visits were conducted to determine the percentage of vegetation and to prepare a list of plant species. To investigate the physical and chemical properties of the soil, sampling from 12 sites and dividing it into four homogeneous groups was performed by means of ANOVA and Duncan test. The results showed that different marl formations in Ardakan desert areas include marl with gypsum, sandstone and conglomerate and lime. Most marl lands are vegetation-free and sometimes rocky. But in some parts of the marl, especially in the waterways, low density rangeland bushes play an effective role in controlling groove erosion and groove fixation. The most consistent species (83% in vegetated plots) is the marshy land of Salsola tomentosa. Comparison of soil chemical properties of marl groups showed that alkalinity, gypsum, salinity, calcium and magnesium and lime variables had significant differences at 1 and 5% probability level. Therefore, it has caused differences in the establishment of vegetation and species.
Area of Expertise : Marni Formation, Erosion, Vegetation, Soil conservation, Desert, Ardakan

6
Prioritization of vulnerability criteria in Azimiyeh (Karaj) against the flood based on the Delphi method
( 43 Visit ) ( 20 Download )  Abstract And Keywords
Publication Information : Volume 9 - Number 33 - Successive Number 33
Auhtors :
Abstract : Iran is among the 10 most vulnerable countries in the world. Among natural disasters which caused this vulnerability, flood has high priority. Paying attention to the vulnerability of the country as well as the vulnerability of cities against the natural disasters threats is one of the most important aspects of development planning. Hence, making decision in urban areas is one of the most important issues in modern management. The purpose of current research is to prioritize urban vulnerability to floods using Delphi method. The statistical population includes specialists who had sufficient knowledge and experience in the field of vulnerability management in urban areas. To carry out this research, initially the factors influencing urban vulnerability to floods was determined through literature review. After that effective indicators were ranked and selected using expert’s opinion and Delphi method. Based on the results, the main channel transmission capacity and flood control operations with 30.2%, drainage density with 29%, topographic conditions and land use of urban area with 28.6% were the most important criteria. The results of this study demonstrated that Delfi method is an appropriate and acceptable tool to development effective indicators in depicting of the cities vulnerability against floods.
Area of Expertise : Urban flood, natural disasters, Decision making, criteria, Karaj

7
Analysis of Spatial-temporal Trend in climatology Variable by using GIS and statistical technic (A case study: Southern-Khorasan province)
( 28 Visit )  Abstract And Keywords
Publication Information : Volume 9 - Number 33 - Successive Number 33
Auhtors :
Abstract : Climate changing and spatial and temporal variation that influences Agricultural productivity efficiency, food security, water quality, and quantity that economics, health, and welfare local community are reduced. Understanding this object is very important in Southern Khorasan with 43% of the rural population. In this research, the spatial (31 Station in southern Khorasan province) - temporal (2027-time series, monthly, seasonal and annual) trend in rainfall, maximum and minimum temperature, number of rainy and frost day, evaporation, sunshine hours, relative humidity, maximum rainfall in a day are studied in 1989-2015 and 1975-2015 periods. Data are analyzed using Standard Index, Mann-Kendall test, linear regression, Sen’s slope estimator, and using ArcGIS10.3 and GS+ software. The results show that slope of variation in rainfall, minimum Temperature, number of frost days, and average rainfall in rainy day variations are more than other parameters. Negative (decreasing) trends and level of significance depending on the parameter type, station position, and length of the statistical period. Spatial and temporal variations in monthly time series have been irregular and complex. The general Trend direction is Drought, warmer summers, and colder winters.
Area of Expertise : Spatial-Temporal, Variation, Standard Index, Mann-Kendall, Sen, South-Khorasan

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