اسم المؤلف:
جميلة فاخر محمد
اسم المشرف:
اسحق صالح العكام
المستخلص:
Alluvial fans are one of the most prominent features of water deposition in the avid and semi avid regions.It separates between the nature of the center flow within the drainage basin runoff which spread easily on the environment of sedimentation.The study of Alluvial fans by two trends; the first of which is geomorphology an independent unit, with characteristics that distinguish the fan floodplains from the rest of the units basin water drainage through the study of the mechanism of formation, growth, the factors affecting it, the characteristics and environmental features, geomorphological processes that take place over it. The other trend was the study of alluvial fans as part of the integrated flood that is influenced by processes that take place with full parts of the basin, where the reached inputs affect geomorphological processes that occur on the surface of the basin. Their effects are shown on all parts of the basin, including the alluvial fan. The study consists of six Alluvial fans with the drainage basins.It contains extends in most AL - Najaf plateau and parts of the provinces of Al - Diwaniya and AL - Muthanna. The extends between (29.49 - 32.9)North Latitudes and between (42.29 - 45.1)east Longitudes. The study area Occupyies (23155)km2 of the surface area of Iraq.It occupied alluvialfans(156.1)km2, of basins (22998.9)km2of the regions of the whole area.The study takes the north - east direction.The emergence of depositions alluvial fans at the end of the canyons, where these sediments formed (156.1 km 2), with a rate of (0.67%) from the area configurations. It is an index of the consecutive periods of deposition and erosion by changes in the time Blaistaseen, These formations have continued in the deposition until the time of the Holocene ,it was reached to the forms of alluvial fans by comparing the geometry where the same model figure fans have included fans (Alkur, Abu doab, Abu Shinan). The fans that have triangle shapes include two fans (hasap, Alheiazi), whereas Valley Faraj fan, has an abnormal shape.It was concluded that the shape or (semi - turbofan). It was concluded that applying Milton coefficient, and the coefficient of the deposition rate (R) fans the study area, that the fans have reached an advanced stage of the surface construction. It has begun to move from construction to demolition. A laboratory quantitative analysis of the sizes of the surface sediments, where it has (18) samples and (3) samples of each fan, through the analysis that the large - scale sediment was deposited at the scope of fans flood peaks. It appeared that the gravels are the types of sediments which are prevalent in the tops of the fans.The results of the analysis of deposits amid fans have shown the medium sand deposits feet fans over silt and clay analysis. Thus, it appears that the volumes of thesediments across its parts.A morphological analysis of surface deposits that exceed the size (2mm), was conducted where pebbles were analyzed. (324) pebbles are of high proportion of round gravel and a good rotation that rates to (26.67%, 28.15%) in samples amid fans. It has adopted a method called (Krombaan) in the extraction spherical surface sediments, where it became clear which spherical sediments are high in general. The study has reached a spherical proportion of deposit peaks fans flood was (0.68%) where the deposits amid fans spherical sediments reached (0.73%), and the forms of sediments depend on (Zing classification was reached through it to the sharp form (roofing) is the dominant form of grit fans tops.It shows that its average rate is (43.78%) of the percentage of forms of gravel in the fans tops, as a square shape is the dominant form in deposits amid fans flood, where the rate stood at an average (37.04%) of the percentage of forms gravel deposits in the center of the fans. It reached to the degree of risk of floods that occur on the surface of the fans, were divided into three levels, and these levels varied in the areas within the fans, reaching high - risk area of land (57.13 km2), and by(36.6%) of the total fan area , while the medium - risk land area (52.17 km 2) and by (33.42%), while the few dangerous land area has reached (46.8 km 2) and by (29.98%) The classification of land use and land cover in the fans flood relying on the US Geological System (U.S.G.S) by drawing classification maps for uses of Alluvial fans, and the field study of these fans, where the uses were identified land down to the third level of the surface of fans.
اسم المؤلف:
بسمة علي عبد الحسين الجنابي
اسم المشرف:
فاضل باقر الحسني
المستخلص:
تناولت هذه الدراسة التقييم الجيومورفولوجي لمنحدرات سلسلة كاره والتي تعد جزءا من نطاق الالتواءات العالية التي تمتاز بالتواءاتها المتعددة وكثرة تراكيبها الجيولوجية فتبلغ مساحتها (1591,378كم2) , اذ ينكشف في منطقة الدراسة تكوينات جيولوجية تمتد في اعمارها من | This study evaluation Geomorphologicaly the slopes of Gara chain , which is part of a high folded zone characterized by multiple folded and frequent geological structures of an area (1591.378 km 2), as revealed in the study geological formations area stretching in ages from the Triassic to the Miocene as well as deposits of returning to Quaternary age include nineteen exposed rock ranged between very extreme rigidity to fragile depositions , so it created a divergence in the nature of the surface of the severe land terrain and cut into plain land, then graded height between (357 - 2169 m) above sea level.the study area Affected by pressure , tensile and folding movement as well as cut off parts of them because of faults impulsivity and also been affected by the Geomorphological operations and prime factors over time, making it divided into (6) folds President and secondary , forming the Gara chain mountain hater, the climatic fluctuating conditions of warmth and humidity during successive time intervals work in the revitalization of erosion and weathering processes and cutting convex folds and concave with the current climate contribute to the erosion of the slopes of these folds fragments and ground materials transport of high convexity and extreme regions of regression to the concave and the less gradient slope , so the consequent availability of soil at the feet of the highlands and is considered one of the rich soils of minerals and elements useful arable despite the presence a few area , and the vegetation is affected clearly by the degree regression of the area being consistent with the presence of soil, higher the degree gradient less the soil and thus less it's presence, and knowledge of the natural characteristics that draw terrain features identified regression characteristics prevailing in the region, according to environmental variables so was applied both rating (Young, Demek, Zink) but it is matched in terms of class regressions differed in terms of topography realism of the area, so we've put a detailed classification of a special study area depends on the basis for determining the topographical nature, so it divided in to six regional slopes , it has been matching those regions later with rocky nature so it result inverse relationship between them.The study proceeded to analyze and interpret landforms associated with slopes and processes affecting them and determine the types of material movement on the slopes of these cliffs and determine the extent of their response to these operations, as the region as a whole strongly water erosion affected as prevailed where the intensity is very high erosion amounted percentage (70.84%) of the total area of the study area, followed by severe erosion, which amounted percentage (16.95%) of the total area, and third place it was the intensity of high erosion, reaching a rate of (9.83%) of the total Gara chain space. The wind erosion was simple impact on the region as erosion susceptibility results showed that it ranged from very few erosion in each of the stations Zakho and Dohuk and medium erosion in Aqra station, making these processes contribute to changing the morphology of the slopes from one place to another over time.The study found that the elected water basins of the Gara chain , which included (22) basin hydraulically taken forms between circular and rectangular as well as basins taken an oval forms , this means lower signify the risk of flooding after heavy rain in the valleys and high in other valleys, particularly those valleys with a circular shape, The terrain characteristics has indicated that variation terrain values and the rate of basin texture as a result of the different nature of the rock formations, that although the majority of basins undergoing maturation, and the amount of sediment derived from each of these basins during the year is inversely proportional to the degree of regression rate.In light of these data, the study summarized by setting a standard takes into account the processes and factors Geomorphological most influential on the slopes of the cliffs as this standard ensures determine the reagon risk based on the nature of the rocks and the degree of regression according to the rating for the detailed study area and intensity of water erosion, which are classified into four reagon of danger which is low - risk represented a percentage (64.32%), and the average risk, which represented (9.17%) the risk represented by percentage (15.47%) and extremely dangerous was (11.04%) of the study area and an area that has been its impact on determine the appropriate parts of the Gara chain for the purpose of human use and benefit as a promising lands possess natural ingredients can be used after a proper planning in the future
