النظام الهيدرولوجي لنهر دجلة في مدينة بغداد واثره في بعض الخصائص الجيومورفولوجية
Author name:
مروه عبد السلام محمد
Supervisor name:
اسحق صالح العكام
General topic:
Geography
Specific topic:
Geography
Degree:
Master
University:
University of Baghdad
Language:
Arabic
University location:
Baghdad
First pages:
10T1568 - p.pdf
Abstract:
This study examined temporal changes of the Tigris River in the city of Baghdad included hydrological characteristics of the river section length (48 km) extending from the bridge Muthanna, north of Baghdad to the beginning of the confluence of the Tigris River south of Baghdad, Diyala River. Emphasis was placed on the system study hydrology of the river discharge and the level of water and the factors affecting the variability annually and quarterly on a daily basis, it is found that the water discharge of the river rate may disagree a big difference from what it was since the beginning of 1931 until the year 1998 and declined after the water drainage is very large since 1999 2014 has all the features of this period is the dry years, accompanied by a decrease in the water level reached 28 m after it was recorded 29 and 30 m during the previous years. As a result of the low water discharge in the lack of speed of the water current of the Tigris River where it reached the highest rate of speed when Muthanna 1.699 m / s bridge while I found in the south of Baghdad and arrived at the site 1.258 m / s. All of these factors have helped to increase the tonnage of river rates of the weakness of the river energy to transport and disposal, where the annual rate amounted to load outstanding for the year 2013 (29131200 / ton) and the rate of the bottom load for the same year reached (5826240 / ton), and accompanied by a high in concentrations of dissolved load of the river in 2012 and caused back to the Tigris river water pollution. As a result of the high river cargo rates have effect on river islands properties in the stream that have been changed over the years (1985, 2000,2013) in dimensions and forms an area because of the change Algiomorvolgah operations characteristics of the term to the other, and noticed that most of the islands increased area to reach the highest area in in 2013 and some of them turned into a permanent Islands because of the activity and overcome the deposition process of erosion, but did not arrive in the concentration reaches to the point of bifurcation. The results of the study, said the Tigris River in the city of Baghdad with a small decline (almost straight) reached 25 cm per 1 km and has a hydraulic characteristics of semi - regular in the rectum, but thebiggest difference in the other parts, and found to compare cross - sections of the Tigris River for the year 1991 with clips of 2008 The river has seen a significant change in cross - section transverse to become more flatness and few in the presentation of its course with a shallower depth of change in the pattern of erosion and sedimentation in twists river, increasing the sediment that has worked to increase the friction of the clips coefficient reaching friction for the year 2008 the rate is (17.49m), obstruction of traffic flow when the friction rate (2.68m) in the year 1991, all these entry points geomorphological aspects of the Tigris River advanced aging.
