دانلود رایگان مقاله انگلیسی تحلیل مورفومتریک حوزه های آبخیز اوگانپا و اگبر، ایبادان نیجریه به همراه ترجمه فارسی
عنوان فارسی مقاله | تحلیل مورفومتریک حوزه های آبخیز اوگانپا و اگبر، ایبادان نیجریه |
عنوان انگلیسی مقاله | Morphometric Analysis of Ogunpa and Ogbere Drainage Basins, Ibadan, Nigeria |
رشته های مرتبط | جغرافیا، مهندسی عمران، سنجش از راه دور و سیستم های اطلاعات جغرافیایی (GIS)، مهندسی هیدرولیک |
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کیفیت ترجمه | کیفیت ترجمه این مقاله متوسط میباشد |
نشریه | EJESM |
مجله | مجله اتیوپی مطالعات و مدیریت محیطی – Ethiopian Journal of Environmental Studies and Management |
سال انتشار | 2010 |
کد محصول | F884 |
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فهرست مقاله: چکیده |
بخشی از ترجمه فارسی مقاله: مقدمه |
بخشی از مقاله انگلیسی: Introduction orphometry represents the topographical expression of land by way of area, slope, shape, length, etc. These parameters affect catchment streamflow pattern through their influence on concentration time (Jones, 1999). The significance of these landscape parameters was earlier pointed out by Morisawa (1959), who observed that stream flow can be expressed as a general function of geomorphology of a watershed. The assertion still stand valid following Jain and Sinha (2003), Okoko and Olujimi (2003) and Ifabiyi (2004) who reported that the geomorphic characteristics of a drainage basins play a key-role in controlling the basins hydrology. Morphometric analysis of drainage basins thus provides not only an elegant description of the landscape, but also serve as a powerful means of comparing the form and process of drainage basins that may be widely separated in space and time (Easterbrook, 1993). In the early days, most basins were described as well-drained or poorly drained or they were connoted descriptively in the Davisian scheme as being youthful, mature or old (Gregory and Walling, 1973). The mechanics of how river channels actually form within a basin and how water gets into the channels was only understood in vague terms by both geologist and hydrologists. Measurement and quantitative expression of drainage basin began with the work of James Hutton in 1775. Subsequently, a great step forward was made by Horton (1932) when he crystallized previous works added new measures and proposed general methods for the description of drainage basins characteristic (Gregory and Walling, 1973). Since then, mathematical analysis of drainage basin has been a subject of considerable analysis, both in temperate region (Schumm, 1954; Morisawa, 1959; Sokolov, 1969; Gregory and Walling, 1973; Gardiner, 1975) and in humid tropics (Hewlett and Hibbert, 1967; Ebisemiju, 1976; 1979; Nwa, 1979; Adejuwon et. al 1983; Ayandike and Phil-Eze, 1989; Ifabiyi, 2004). However, morphometric characteristics of drainage basin exhibit spatio temporal variation, hence the need for detail investigation of basin characteristics, not only from one area to another, but also from time to time. This is because, the form of a basin in terms of its morphometric characteristics determine the processes operating in such a basin. This form-process relationship according to Gregory and Walling (1973) produced a temporary dilemma in geomorphological investigation either in the study of form or process. In this work, forms of basins were investigated with a view to understanding the processes operating within them. These kinds of efforts are expected, not only to provide understanding for the past, but also to help in estimating the future and for application to hydro-geomorphic phenomena currently operating in the basins (Carlson and Krikby, 1971). Thus, the result from this investigation will aid in suggesting management techniques that can be adopted in ameliorating land degradation problems being caused by processes operating in the studied basins. Study Area The study area in this investigation is Ibadan, the capital city of Oyo State in southwestern Nigeria, using Ogunpa and Ogbere river basins as data collecting points (Fig. 1). Ogunpa drainage basin is located at the southeastern corner of Ibadan city between longitudes 30 52’E and 30 36’E and between latitudes 70 22’N and 70 26’E while Ogbere drainage basins is located in the south-western part of Ogunpa drainage basin between longitude 30 55’E and 30 58’E and between latitude 70 19’N and 70 27’N. The two basins are situated on a rugged relief (Fig. 2) in the tropical rain forest of Nigeria occupying an area of 40.75sqkm and 52.88sqkm respectively. The basins are covered mainly by ferruginous tropical soil on basement complex rock (Areola, 1978). The two basins are builtup as a result of urbanization process, which is fast replacing the natural vegetation in the basins with artificial paved surfaces with consequent effects on runoff production and sediment generation. (Akinola, 1966, Akintola, 1974; Faniran, 1991). |