A performance evaluation of geophysical methods for detecting underground cavity around sewer

Surface Geophysical Methods for Detection of Underground Mine Workings

Efforts to delineate underground mine workings in the vicinity of tailings impoundments has relied on available maps and confirmatory boreholes. Often the characterization of regions between boreholes remains suspect or entirely unknown. Surface geophysical measurements can be used to supplement the borehole data and better delineate these intermediate zones. Furthermore, geophysics can be used...

Evaluation of Geophysical methods for identifying hidden Quaternary faults in alluvial sediments (case study: Chitgar Park)

Abstract In this research, Geophysical methods Ground Penetration Radar (GPR) and Geoelectric have been used to detect hidden Quaternary faults in alluvial sediments located southwest of Chitgar Forest Park (District 22 of Tehran). The study of profiles (GPR) identified areas such as fault. The results obtained from two Geoelectric profiles indicate that there are two zones with low electrical...

Performance evaluation of different estimation methods for missing rainfall data

There are numerous methods to estimate missing values of which some are used depending on the data type and regional climatic characteristics. In this research, part of the monthly precipitation data in Sarab synoptic station, east Azerbaijan province, Iran was randomly considered missing values. In order to study the effectiveness of various methods to estimate missing data, by seven classic s...

Going Around in Circles? A Qualitative Evaluation of a Proposed Metro Map for Melbourne's Underground System

When cities develop a rail network – above or under ground – this is usually accompanied by the publication of a metro map. The map is an essential adjunct, produced and provided to commuters to facilitate informed use of the system. It is generally agreed that the exemplar metro map is that of the London Underground, designed by Harry Beck, in 1931. Beck’s design principles have been copied, m...

Methods of Sewer Rat Control