Introduction of Three-Dimensional Geology Models and Their Application for Layering of Alluvial Aquifers (Case Study: Bojnourd Aquifer)

فصلنامه آب و توسعه پایدار

Article 12, Volume 4, Issue 2 - Serial Number 9, March 2018, Pages 103-110   

Document Type: review paper

DOI: 10.22067/jwsd.v4i2.52069

Authors

mina tajabadi^{* 1}; ali naghi ziaei²; aziz allah izady³; roh alamin bahrami²; javad meshkiny⁴

¹Ferdowsi

²ferdowsi

³Sultan Qaboos University

⁴--

Abstract

The purpose of this research is the introduction of methods and tools for determination of aquifer stratigraphy and their application. In alluvial aquifers which have extreme changes in sediments, stratigraphy modeling is not suitable, and it is better to use three-dimensional lithology models found in the Rockworks software or T-Progs tools in the GMS software. In this study, using the three-dimensional modeling techniques in the Rockworks software, the three-dimensional lithology model of the Bojnord aquifer lithology of the Bojnourd aquifer, located in the North Khorasan province, with information including logs and geophysical studies has been obtained. Here, the alluvial aquifer consists of three soil textures: coarse, medium, and fine grain which the very fine texture (very fine grain) is considered as the aquifer floor texture in order to solve the lithology modeling problem. Results show that the existence of lens and heterogeneity of sediment in the aquifer influence the accuracy of the estimated hydrodynamic coefficients. Therefore, using three-dimensional lithology modeling techniques, especially in alluvial aquifers, causes changes in the hydraulic conductivities of fine to very coarse-grained sediments. Additionally, the use of three-dimensional alluvial modeling techniques for groundwater flow modeling, especially in aquifers with severe heterogeneity, leads to the identification of an aquifer with an adequate accuracy.

Keywords

Stratigraphy; Alluvial deposit; Lithology modeling; Rockworks; Bojnoord

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