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Volume 6, Issue 1 (11-2012)

The Water infiltration rate of a catchment area depends on a number of parameters. Each catchment area has its own peculiar infiltration features, depending on its climate and soil structure This research is a study and comparison of the banks of two permanent rivers of Bushehr Province (Iran), namely, the Mond and the Bahoosh, in the County of Tangestan. In order to determine and check the best penetration model and to calculate the infiltration coefficients of the Kostyakov-Lowese, SCS, and Philip models, the vertical water penetration rate of the soil was measured using field Double Ring tests (repeated for three times) in 60 test pits. Using computing software, the infiltration and aggregate infiltration rates’ curves were drawn and a Visual Basic software program was used for each model to specify the best coefficients, that is, those with the highest correlation with the curves. Results show that, for the Bahoosh riversides, the American SCS infiltration model has less errors than the Philip and Kostyakov-Lowese models, and for the Mond riversides, the Philip model is better than the Kostyakov-Lowese and American SCS models.
, Greza Khanlari, M Heidari, Yazdan Mohebi, Reza Babazadeh,
Volume 7, Issue 2 (3-2014)

Awareness of orphological features of rivers is necessary for recognition of river behavior and optimum application of rivers. Overall catchment physiografy have important role for determination factors such as floods, erodible and sediment mutagenicity. In this study in order to understand the behavior of Gamasiab River in the east of Kermanshah province, geomorphologic features of this river has been considered. Study of engineering geomorphologic properties is done by using existing data from previous studies, site visit and field perceptions, study of geology and topography maps. Physiographic properties of catchment, channels morphologic properties and geology conditions in this region have been studied. In this research, several parameters such as average width, environment, area, hydrogeologic coefficient, catchment form, maximum, minimum and mean high, and longitudinal slope has calculated. Also status of drainage density of this river has been investigated and time to focus calculated. Finally this river review and classified according to various classifications for rivers
Dr. Davood Fereidooni, Dr. Sajeddin Mousavi, Dr. Esmaeil Najafi, Dr. Gholam Reza Khanlari,
Volume 16, Issue 4 (1-2023)

Assessing and understanding the hydromorphological characteristics are necessary to understand the behavior of a river and its active processes. This is useful for understanding the erosion and sedimentation regime and changing the river path, for making correct engineering and human activities in the river's catchment area. The Gian River, with an average annual discharge of 2.3 m3/s, is one of the tributaries of the Gamasiab River in the Hamedan province. From a geological and hydrogeomorphological point of view, the Gian is a small river. It is fully compatible with the geological structures of the region. The calculation of the sinusoidal coefficient has shown that this river is a meandering river whose wavelength, the amplitude of the oscillation and the width of the meander belt are smaller in the mountainous area than in the plain area The gradient of the river bed is relatively low and it is classified as an erosion and sedimentation river in its different sections. The Gian River has a rocky bed in the mountainous part and an alluvial bed in the plain. The Gian River has a small catchment area, and, according to theGravelius' coefficient, its shape is almost elongated. The catchment elevation of the Gian River is between 1455 and 2700 with a weighted average of 1715.20 m.a.s.l. and its area decreases with the increase in the elevation. The concentration time of the catchment is 4.204 hours. The application of the data and results of the research can be very effective in land use planning, engineering and executive applications to predict river changes and protect engineering structures such as roads, bridges, coastal structures and railways, protect agricultural lands in the region and develop tourism.

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