Siavush Shayan; Gholam Reza Zare; Shahram Amiri
Volume 20, Issue 79 , November 2011, , Pages 37-45
Abstract
The science of Geomorphology is the study of ground surface unevenness. Geomorphology provides the best basis for classifying the ground. One of the outcomes of the work of Geomorphologists is the preparation of geomorphologic map, which is the result of long-term research efforts. The preparation of ...
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The science of Geomorphology is the study of ground surface unevenness. Geomorphology provides the best basis for classifying the ground. One of the outcomes of the work of Geomorphologists is the preparation of geomorphologic map, which is the result of long-term research efforts. The preparation of these maps always follows certain principles and methods. Obviously, in recent years, geomorphologic maps have been developed using new techniques and computer manipulations such as GIS. The important issue of geomorphologic maps is the standardization, which has been remarkable, and some action has been taken in this regard. The purpose of the preparation of geomorphologic maps is to record the information on landforms, materials, soil and rock, ground processes and, in some cases, the age of the landforms. In this way, they provide a basis for ground-based assessment that is useful in many environmental issues. Therefore, geomorphologic maps are not only a scientific and research basis for different researchers, but regarded as a tool for sustainable development and advancement. Familiarity with it, the way of drawing and its developments, the necessity and the aspect of its applicability are of significant importance.
Siavush Shayan; Kazem Bahrami; Shahram Bahrami
Volume 19, Issue 76 , February 2011, , Pages 55-60
Abstract
Aggregates are part of building materials including hard materials such as sand, gravel and rubble, which, after being combined with other adhesive materials, can be used in the production of concrete, mortar and plaster, and in the construction of roads and railways, Bridges, tunnels, dams, airports, ...
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Aggregates are part of building materials including hard materials such as sand, gravel and rubble, which, after being combined with other adhesive materials, can be used in the production of concrete, mortar and plaster, and in the construction of roads and railways, Bridges, tunnels, dams, airports, and other construction purposes. The present study investigates the formation, dispersion and distribution of aggregates in relation to landforms and geomorphologic processes. The result of this study is that a large part of aggregate resources are formed in river landforms or alluvial environments such as the current and old river basins, the intersection of the rivers, the new alluvial terraces, and parts of the alluvial fans. In glacial environments, forms such as alluvial ice plains, kames and eskers are considered as among prone areas for the formation and exploration of aggregates. In coastal areas, continental shelf sediments and littoral drift and some ancient geomorphological forms, and dunes in the desert areas are capable of exploring aggregate resources. In erosional anticlines or anticline ridges that are hard at the top and loose at the bottom, there are large zones of debris that, if fresh or poorly weathered, can be a very good source for extraction of aggregates. Also, geomorphologic processes such as weathering, erosion and transportation of materials, physical and chemical degradation, as well as tectonic factors and geomorphologic changes play very important role in the formation, dispersion and quality of aggregates and building materials.
