جستجوی مقالات مرتبط با کلیدواژه "water resources management" در نشریات گروه "اکولوژی"

To do this, 31 hydrological variables of streamflow in 16 sub-watersheds of the Gorganroud watershed, which were equipped with hydrometric stations, were calculated using Indicators of Hydrological Change (IHA) software. Shannon's entropy was used to weight the hydrological variables of the streamflow. Finally, four Multi-Criteria Decision-Making Methods (MCDMs) including Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS), VlseKriterijumska Optimizcija I Kaompromisno Resenje (VIKOR), Simple Additive Weighting (SAW) and COmplex PRoportional Assessment (COPRAS) were implemented to prioritize the subwatersheds. The results showed that C23 (zero flow days) and C27 (high pulse count) variables received the highest and lowest weights with values of 0.057 and 0.006, respectively. The results of the subwatersheds prioritization based on the hydrological security showed that subwatershed S11 according to TOPSIS and VIKOR methods and subwatersheds S15 and S2 according to SAW and COPRAS methods have the highest hydrological security score. On the other hand, subwatershed S10 according to TOPSIS, VIKOR and COPRAS methods and subwatershed S14 according to SAW method were given the last priority. Evaluating the efficiency of MCDM methods showed that the VIKOR method provided more accurate results with the least intensity of variations.

Therefore, the purpose of this study is the statistical analysis of the 33 indicators of hydrologic alterations (IHA) in five main groups (magnitude-duration-timing-frequency-rate of change) in stations affected by the Bustan, Golestan and Voshmgir dams in the before and after periods of construction these dams using the IHA software version 7/1 and investigate is the climate variables change. For this purpose, the calibration and validation of the HBV hydrological model in the before period of Bustan, Golestan and Voshmgir dams construction and the amount of daily discharge in the after period of dams construction was simulated. The results of simulation of the affected stations of the dam with HBV model showed that the model has good performance in both periods (calibration and validation) in the before period of dams construction. The results showed that in the calibration period of Oghan, Gonbad, Ghazaghli and Aqqala hydrometric stations with Nash coefficient of 0/52, 0/67, 0/80 and 0/61, respectively, as well as in the validation period of Oghan, Gonbad, Ghazaghli and Aqqala hydrometric stations, respectively have the best performance with Nash coefficient of 0/59, 0/41, 0/58 and 0/54, respectively. According to the results, hydrological indicators of monthly flow show that in Oghan station under the influence of Bustan dam about 30%, in Gonbad and Ghazaghli stations under the influence of Golestan dam about 52% and 30%, respectively, and in Aqqala station downstream of the dam and 49% in the river.

The increasing demand for water has led to the development of various methods for water resources management. Some structural methods include the construction of barriers in the path of surface flows and make water reservoirs, which earth-fill dams are in this category. Efficiency and productivity of a dam depend on many factors, most importantly, the suitable areas for the construction of these dams. This research was conducted with the aim of developing a decision support system based on RS and GIS techniques and identifying and prioritizing suitable areas for the construction of earth-fill dams in the Beheshtabad watershed of the North Karun watershed. For this purpose, previous studies in this field were reviewed and effective criteria in locating the earth fill dams were selected. After selecting the set of criteria, a pairwise comparison questionnaire was made and provided to relevant experts. Then, using the Analytic Hierarchy Process (AHP), prioritization and determination of the relative weight of these criteria were performed. Maps of each factor were prepared and standardized; then weights obtained by AHP method was then applied to them. Finally, the map was prepared with three categories of inappropriate, good, and very good for the construction of the earth-fill dam in the region. The results show that geomorphologic and geological criteria with the highest weight are the most important in determining the suitable location for earth-fill dam construction. This criterion composes of four sub-criteria: Karst, Fault, Landslide and Erosion. After this criterion, topography, investment, land use, distance from groundwater sources, distance from road and soil depth were ranked in order of importance. It was also found that more than four kilometers of the hydrological network of this watershed have a very good capability for the construction of short earth-fill dams in order to manage water resources.

Lack of water, energy and food (WEF) resources due to rapid population growth, climate change, ecosystem imbalances and economic diversity are the biggest challenges for the world today. In this paper the optimal management of WEF resources is investigate with the nexus approach and using the concept of water footprint in the Dez basin located in Khuzestan province. In order, the water footprint of major horticultural crops cultivated calculated in this basin. Also, in order to provide strategic solutions in the optimal management of water resources with regard to the three components of WEF, the TOPSIS analytical method has been used. The results show that the highest index of water footprint of crops was related to mung bean, rice, sugarcane and rapeseed, respectively, which were equal to 4945, 2671, 1462 and 1227 cubic meters per ton, respectively. Finally, according to the analysis and priority of effective strategies on WEF resources management by TOPSIS method, five criteria such as optimal collection and extraction of WEF resources, changing irrigation pattern and implementation of low-demand methods, agricultural water resources quotas, development of risk management and crisis to prevent the loss of quantity and quality of WEF resources in order to improve agricultural products, recycling and reuse of water by emphasizing the replacement of effluents for agricultural use and green space by using new methods for water extraction; They are ranked first to fifth as important and effective strategies.

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Todays, the world development is facing serious water quality issues. Since protect of water quality and ecosystem healthy is an important aspect of ecohydrology. The present research aimed to analyze the temporal trends of water quality parameters of Mashin Zard river station in order to planning long term management approaches. In this research, trend of some significant factors of water quality such as K, Na, Mg, Ca, So42, Cl, HCo3, pH, Ec and TDS during 1970 to 2013 in Iran calendar by the Mann-Kendall nonparametric statistical test, Liu method and Piper diagram has been studied. The results showed that four factors such as K, Ca, Mg and So4 had increasing trends in the study period. Whereas, Na and Cl had decreasing trend. The results of this study showed that there are serious challenges related to water and land management issues. So, these results are essential basis for achieving the important goals of region ecohydrology.