Evaluation of regional fracture properties for groundwater development using hydrolithostructural domain approach in variably fractured hard rocks of Purulia district, West Bengal, India

Journal of Earth system science

Rajesh Prasad1²  Tapas Acharya1²  S Chakrabarti2¹ 

[1] Department of Applied Geology & Environmental Systems Management, Presidency University, 86/1 College Street, Kolkata 700 073 India.$$;Department of Geology, Hooghly Mohsin College, University of Burdwan Chinsurah 712 101, India.$$

关键词: Fractured rocks;    geostatistics;    heterogeneity;    hydraulic properties;    metamorphic rocks.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Estimation of geohydrologic properties of fractured aquifers in hard crystalline and/or metamorphosed country rocks is a challenge due to the complex nature of secondary porosity that is caused by differential fracturing. Hydrologic potentiality of such aquifers may be assessed if the geological controls governing the spatial distribution of these fracture systems are computed using a software-based model. As an exemplar, the Precambrian metamorphics exposed in and around the Balarampur town of Purulia district, West Bengal (India) were studied to find out the spatial pattern and consistency of such fracture systems. Surfer and Statistica softwares were used to characterize these rock masses in terms of hydrological, structural and lithological domains. The technique is based on the use of hydraulically significant fracture properties to generate representative modal and coefficient of variance (𝐶𝑣) of fracture datasets of each domain. The 𝐶𝑣 is interpreted to obtain the spatial variability of hydraulically significant fracture properties that, in turn, define and identify the corresponding hydrolithostructural domains. The groundwater flow estimated from such a technique is verified with the routine hydrological studies to validate the procedure. It is suggested that the hydrolithostructural domain approach is a useful alternative for evaluation of fracture properties and aquifer potentiality, and development of a regional groundwater model thereof.

【 授权许可】

Unknown