Mohsen Maleki; Habib Hasani; Masoome sadat Hosseininasab
Abstract
Watershed management practices have been implemented to avert land degradation and to enhance people's livelihoods in Iran for several years. The successes of these practices have been quite limited and the rates and intensities of adoption on local people haven’t identified. This study has been ...
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Watershed management practices have been implemented to avert land degradation and to enhance people's livelihoods in Iran for several years. The successes of these practices have been quite limited and the rates and intensities of adoption on local people haven’t identified. This study has been introduced an approach to consider some socioeconomic parameters from the stakeholders aspect which are important for watershed management decisions. Hasan abdal basin in Zanjan Province was selected as the case study area. The field data has completed with questionnaire instrument. The statistic population of this research was all 280 heads of families of stakeholders which living in this area. Among them, using Morgan table, 160 people were randomly asked questions directly. In this research, the Likert scale was used to analyze and measure the effects. The method of exploitation factor analysis was used to determine the factors. The validity of the questionnaire was calculated in KMO of 0.7 percent. The results of factor analysis indicated that effective parameters are in fore group's including improvement stakeholder participatory, flood control, reducing the migration and improving livelihoods. These fore factors, in general, had more than 67 percent of the total variance. The results showed that although watershed management projects in the region have been able to affect the four factors mentioned, but its manifestation in other aspects of life, such as improving the health of the village, the desire of villagers to stay in the region, improve income generation, reduce costs irrigation and dry farming crops have improved.
majid mohammad esmaeili; mohammadreza Mojtahedi; Khironesa Mirnia
Abstract
Flooding is one of the most important environmental stresses that affect the performance of plants. The effects of flooding height on the performance of the two species A.littoralis, J.maritimus were studied. This experiment was carried out the factorial experiment in a completely randomized design with ...
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Flooding is one of the most important environmental stresses that affect the performance of plants. The effects of flooding height on the performance of the two species A.littoralis, J.maritimus were studied. This experiment was carried out the factorial experiment in a completely randomized design with 4 treatments and 8 replications. After 2.5 months of ultimate recovery tests were performed. The number and length of stolons of A. littoralis were counted separately in each treatment. The number and length of rhizome J. maritimus species in each plot (pot) were counted. The total weights of dry matter, shoot dry weight, dry weight of underground organs were measured in each experimental unit. Analysis of variance showed that the effects in controlling the height of flooding on all performance indicators studied (excluding the effects of flooding on root dry weight) of two species A. littoralis and J. maritimus is significant. Comparison of performance indicators A. littoralis species show between the two treatment groups (7 cm below the water level and water treatment) and treatment (treatment without irrigation and 15 cm below the water level) there is a significant difference. Comparison of performance indicators J. maritimus species show a significant difference in the number of rhizome, total length of underground rhizome and dry weight were observed. Comparison of dry pasture species show the highest production of the two types of treatment 7 cm below the water level.
hamed nozari; safar marofi; mahnaz edirsh
Abstract
According to the annual damages of flood in Dez river catchment and the lack of information about water quantity which contribute substantially to the flow of the river in the middle sub-basins, the aim of this study was to determine the contribution of sub-basins flow to total basin flood and to identify ...
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According to the annual damages of flood in Dez river catchment and the lack of information about water quantity which contribute substantially to the flow of the river in the middle sub-basins, the aim of this study was to determine the contribution of sub-basins flow to total basin flood and to identify areas of flooding potential. So, the standard precipitation index was calculated to identify the wettest period in the region. Then, the whole basin was divided into 11 sub-basins and subsequently a rainfall-runoff simulation was carried out by using WMS software. Finally, the contribution of each sub-basin to the outlet flood peak was quantified by successively eliminating sub-basins from the simulation process. The result showed that the Dokouheh sub-basin by decreasing the peak flow (40 percent) is the most effective region in flooding. Then, Hamidabaad with 35 percent and Dez dam with 15 percent are the sub-basins with more flood potential, respectively. In addition, to eliminate the effect of sub-basin area, prioritization was done corresponding to the contribution at the outlet per unit area of sub-basins. Dokouheh with 29 percent, Hamidabaad with 25 percent and Dezful with 15 percent were given first, second, and third rank, respectively
Sadegh Tali-Khoshk; Mohsen Mohseni Saravi; Mahadi Vatakhah; Shahram Khalighi-Sigarodi
Abstract
Because of insufficient factors including facilities, budget, human resources as well as time watershed operation is not applicable throughout the basin. As a result, watershed operation should be performed in the sub-basins in which is more affectionate and the risk frequency of some events such as ...
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Because of insufficient factors including facilities, budget, human resources as well as time watershed operation is not applicable throughout the basin. As a result, watershed operation should be performed in the sub-basins in which is more affectionate and the risk frequency of some events such as destruction, degradation; physical and financial damage and also flooding are considerably high. In addition, due to hydrometric stations, defects or the lack of stations in some areas, some efforts have been made experts recently to assess and consequently introduce some novel and reliable methods for prioritizing on the basis of current data obtained from sub-basins features of different geographical regions. In current study, the utilization possibilities of neuro-fuzzy technique and SCS in HEC-HMS model that have different potential to examine a wide range of advantageous and disadvantageous in making various decisions were studied. To determine the prediction accuracy of these methods, the rate of flow and sediment output of Taleghan sub-basins were taken over one year. The results of these methods were then compared with the maximum two-year return period flow observations. Our results revealed that in making prioritization, neuro-fuzzy as compared with the SCS method can produce the best prediction as long as the coefficients of errors, efficiency compared to the observational data and predictions are taken into account.
