mahboobeh sarbazi; Sadat Feiznia; Mohammad Mahdavi
Abstract
Water quality is always one of the major challenges for managers and decision makers in water resource management. However, the problems of water quality are more important than quantity. One of the main ways in thorough review and assessment of water quality using multivariate statistical techniques ...
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Water quality is always one of the major challenges for managers and decision makers in water resource management. However, the problems of water quality are more important than quantity. One of the main ways in thorough review and assessment of water quality using multivariate statistical techniques are, the majority of changes to a system, in order to identify important factors that influence could explain. This study classified zone Groundwater Quality Mashhad plain terms of agricultural potential and its quality review process has been carried out in recent decades. Therefore, the quality of groundwater for agricultural use was studied and maps of quality classification for 2001-2011 years were prepared. Then, using geological map, the effect of geological formations on degradation of groundwater quality was assessed. For water quality analyses, 10 important water quality variables in 39 selected wells were measured and they were analyzed using multivariate statistical techniques. The statistical analyses which were used are: Factor analysis for determining the most important variables, cluster analysis for determination of variables homogenous groups and Pearson Correlation for investigation of relationships between variables. The results have shown the best relationship between geological formation and quality factors. Also, the results of Factor Analysis also showed that EC and TDS 71.02 of the total variance explained by factor loading 0.98 and pH 14.91 of the total variance explained by factor loading 0.93 are the most important variables affecting the quality of groundwater in the study area.
sadat Feiz Nia; Mariam Musavian; Zohreh Abdolahian Dehkordi; Khadijeh Ebrahimi Dorche
Abstract
Physical characteristics of drainage basins suchas geological materials, landuse type and vegetation cover, soil type, surfacepermeability, depth of underground water table, topographical conditions anddrainage are important factors in flood occurrence which affect prevailingequations on water movement ...
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Physical characteristics of drainage basins suchas geological materials, landuse type and vegetation cover, soil type, surfacepermeability, depth of underground water table, topographical conditions anddrainage are important factors in flood occurrence which affect prevailingequations on water movement in drainage and determine storage capacity ofdrainage basins. Geology is one of the most important factors affecting floodoccurrence of drainage basin. In this study it is attempted to investigate theeffect of geology factor on flood occurrence in Joneghan drainage basin,Shahr-e – Koord, using a new method. In this respect, after preparing base mapsconsisting of slope amount , geology , landuse , erodibility of geologicalmaterial , soil depth and drainage pattern , studies were performed in twostages as follows: In the first stage, flood occurrence of hill slopes of eachsub- catchment was investigated. For doing so, work unit map was prepared usingslope and infiltration maps. Then in each sub-catchment, land use, erodibilityof geological materials and soil depth were overlaid with work unit map one byone and dually. In the second stage, flood occurrence of drainage wasinvestigated as follows: First, longitudinal profile of main drainage of eachsubcatchment was prepared using GIS. For investigation of flood occurrence ofdrainages, slope and permeability of geological units were used. The results ofthe first stage showed that permeability, slope, erodibility of geologicalmaterials and soil depth have the greatest effect on flood occurrence,respectively. Also based on this four – factor method, subcatchments weredivided into five flood occurrence classes as follow: low, low to medium,medium, relatively high, and high. The results of the second stage showed thatdrainage flood occurrence belongs to two classes of low to medium and medium.By combining slope and drainage flood occurrence, it can be concluded that thethird subcatchment with medium flood occurrence is more susceptible to floodrelative to other subcatchments. With regard to the results of the presentstudy, it can be concluded that geology has high impact on flood occurrence andpermeability of geological materials decrease flood occurrence in the basin.
