علوم غیرزیستی دریا
Siavosh Shayan; Zahra Dadashzade; Mojtaba Yamani; r l
Abstract
The importance of scale issues in geomorphic studies is the definition of wide variables in the analysis of levels with different scales that are projected according to goals and abilities. Considering that in sedimentary cell systems, there are processes that operate on a wide range of scales, it is ...
Read More
The importance of scale issues in geomorphic studies is the definition of wide variables in the analysis of levels with different scales that are projected according to goals and abilities. Considering that in sedimentary cell systems, there are processes that operate on a wide range of scales, it is important to determine the appropriate scale for studying these processes and their forms. In this study the coasts of Hormozgan province due to the diversity of landforms and coastal processes in its western and eastern parts was investigated. This coastal is divided into 6 cells and 17 sub cells based on geomorphologic unit and wave and currents pattern. 1: 25000 topographic map, 1: 100000 geology map, LandSat 5 satellite images, hydrodynamic data, wind, hydrology and large port dredging and sedimentology data were used for this purpose. This data was analyzed in ArcGIS 10.2 and coastal environment were classified based on common features of the form and process. Also an appropriate scale was determined for studying littoral cells based on our aim. The results indicated that all of these scales should be considered to determine management strategies. Studies have shown that scales used for coastal study include system scale (large scale), subsystem scale (moderate scale) and landform scale (small scale). temporal and spatial scales in the form of a littoral cell are in a moderate scale. It can be concluded the medium scales are usually of greatest interest for coastal management.
علوم غیرزیستی دریا
Siavosh Shayan; Mohammad Akbarian; Mojtaba Yamani; Mohammad Sharifikia; Mehran Maghsoudi
Abstract
The instability and mobility of sand dunes is a major concern of planning and management in arid coastal plain. Usually, the dune systems are created based on several factors and elements. In order for environmental planning and management in coastal zone, the study of their formation and development ...
Read More
The instability and mobility of sand dunes is a major concern of planning and management in arid coastal plain. Usually, the dune systems are created based on several factors and elements. In order for environmental planning and management in coastal zone, the study of their formation and development process has a major task. The present study is dale with factors identify for sand masses main processes and formed in western part of Makran coastal plain. Data set consist of spatial map of landforms distributions, winds velocities and directions, fetch length as well as dynamic waves were collected and processed. These data along with thematic maps of geology and topography as well as remotely sensed data (satellite images and aerial photographs) were used for further processing and analysis. The Geomorphologic units map was generated as first step. Next wind and wave rose's diagrams were provided. Furthermore, elongation and direction of sand masses movements was extraction form multi-temporal and multisensory data. Main rivers monthly discharges were analysis related to their hydrometric water stations and previous studies. Results indicate that location and distribution of coastal sand masses isn’t functioned by wind; it's more affected by the geomorphologic characteristics of foreshore and coastal hydrodynamics. Also distribution of internal sand masses on coastal plain is more affected by the plain stretches relative to the prevailing wind direction and to the extent of the old beds and floodplain that are exposed along to the prevailing wind nether than wind function.