Younes Daghigh; Ali Toloueiyan
Volume 2, Issue 4 , January 2011, , Pages 250-256
Abstract
One of the subjects that should be considered in coastal dykes design is interaction of saltwater and freshwater in the body and under the dykes. This paper evaluates the effect of clayey blanket and vertical cutoff on freshwater and saltwater interaction in the body and under the dyke by using ...
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One of the subjects that should be considered in coastal dykes design is interaction of saltwater and freshwater in the body and under the dykes. This paper evaluates the effect of clayey blanket and vertical cutoff on freshwater and saltwater interaction in the body and under the dyke by using CTRAN/W finite elements model. This model has developed during 2001 at Alberta Canada for studying on movement of contaminants such as salt and polluter particles through porous materials. In this study, five analyses group have been performed. First group was studying on status of salt invasion promotion after the dyke constructing and before filling from river water. Second group was after filling of dyke side to 3.5 meters height. Third group analysis was the same as second group but using clayey blanket instead. Fourth group was analysis was the same as second group but using vertical cutoff instead, and fifth group was using conjointly clayey blanket and vertical cutoff. The study shows that: using clayey blanket, the maximum leaching speed occurred after 5 days, while after 10 days, it remains constant. Also conjunctive use of clayey blanket with vertical cutoff had the maximum effect on prevention of soil salinity.
Alireza Habibi; Samad Shadfar; Younes Daghigh
Volume 2, Issue 1 , May 2010, , Pages 18-24
Abstract
Recognition from coverage amount of country present conditions in a watershed is unavoidable necessity for optimal and permanent development and utilization. In this research, we choose Fashand watershed in north-eastern of Hashtgerd city. First have recognized independent variables to predicting country ...
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Recognition from coverage amount of country present conditions in a watershed is unavoidable necessity for optimal and permanent development and utilization. In this research, we choose Fashand watershed in north-eastern of Hashtgerd city. First have recognized independent variables to predicting country power. Then prepared various weight maps as informational layers using field studies and Geographical Information Systems (GIS), and classified and composed them together using coverage index. In next stage, coverage predicting agriculture power map with present country conditions map and calculate correlation matrix. Results showed that predicted area with much week and week talent include intermediate rangelands with 19.47 percent coverage areas with medium talent for agriculture intensity have 0.3 percent stratification. And good and very good predicted areas for agriculture intensity include 39.7 percent, good rangelands 2 percent, poor rangelands 29 percent. Unfortunately 994 Hectares of very good agriculture rascals have specialized to civic areas that shows having no comprehensive programs in this base. Prediction shows that 9259 ha of rascals with 53.17 percent of total areas include very good agriculture lands and medium, week and very week areas include less than 23 percent of total Fashand area. Finally, we suggest that programmers and propagators present a model for each area regard to ecological power of area and present intensities conditions, to have in mind area with optimal utilization and suitable intensity use.
