جستجوی مقالات مرتبط با کلیدواژه "سامانه اطلاعات جغرافیایی" در نشریات گروه "مهندسی آب"

One of the important environmental problems is finding a place suitable for municipal solid waste disposal (Landfill). Choose the wrong place causing damage to the environment, human health and pollution of surface and groundwater. Several factors affect landfill site selection and there are different ways to this issue. In this paper, GIS and analytic hierarchy process (AHP) have been used to identify suitable locations for landfill in the city of Susa. For this purpose, four main factors selected that have a substantial impact on the landfill site selection consisting of technical and operational criteria, ecological and biological, socioeconomic and physical. According to these criteria, 15 information layers prepared. The final score of the parameters were calculated by using the paired comparison. After combining 15 data layer using fuzzy analysis and AHP method and helping ARC GIS software, the final map was prepared for Solid Waste. Based on the results, western parts of the city of Susa were proposed for landfill. Because of the great distance from the city of Susa and lack of proper access road, this section has been ignored as the best place appropriate waste disposal. A closer look at the result, 3 regions, with the suitable level of value, range and access road, were determined.

To determine the hydrologic characteristics of a basin, all factors cannot be taken into consideration, but the key factors that are considered to be more influential than others should be taken into account. Physiographic and hydrologic features of the watershed are important parameters to evaluate the watershed condition. The present study aimed to investigate the physiographic and hydrographic characteristics of Gharesou watershed. Among the features are: area, perimeter, slope, aspect, hypsometry, stream network and stream order using GIS. The results showed that in addition to the vastness of the area, the shape of the watershed was stretched which subsequently will increase the time of concentration and chance of infiltration.this is an important issue in runoff management. GIS is an effective and useful tool in improving the accuracy and speed and reducing the costs of studies.

This cross-sectional study has been conducted to determine the corrosion potential of water in Isfahan drinking water distribution system in 2011. Eighty samples during summer and fall 2011(40 samples for each season) were collected from different parts of the Isfahan drinking water distribution system. The temperature, calcium hardness, alkalinity, total dissolved solids, and pH were measured. Values of Langelier, Ryznar, Corrosiveness, and Puckorius indexes were calculated. Zoning maps were prepared using ArcGIS 9.3 software. The calculated mean values of Langelier, Ryznar, Corrosiveness, and Puckorius indexes in the summer and fall were (-0.52), 8.83, 10.37, 10.84 and (-0.71), 9.27, 10.94, 10.88, respectively. These results indicated that the Isfahan drinking water based on Langelier, Ryznar, and Puckorius indexes had a corrosive tendency and based on aggressiveness index had a moderate corrosivity potential. The corrosiveness of water may be as a basis for gradual deterioration of water distribution and transmission pipeline systems or as a route for contaminant entrance and finally can cause unhealthy impacts. Therefore, remedial measures are necessary to corrosion control of Isfahan drinking water

Geographic information systems and remote sensing techniques have been increasingly applied in watershed runoff estimation in recent years. In this research, the runoff curve number map of Birjand’s Mansourabad watershed, eastern Iran, was prepared using geographic information system (GIS), landsat images, and the Indian remote sensing (IRS) images based on the factors of hydrologic soil group, land use, land cover, and the hydrologic conditions. The land cover map was determined using Normalized Difference Vegetation Index, (NDVI); the watershed land use map was produced by satellite data; and the hydrologic soil group map was produced using field survey and watershed soil, slope, geology, and land use maps. Results showed that during the period of 2002 to 2006, land coverage density has decreased and consequently the curve number of watershed and its runoff production potential has increased.