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Electronic acquisition of hydrologic data from intensively instrumented hillslopes
Author(s) -
Durham I. H.,
O'Loughlin E. M.,
Moore I. D.
Publication year - 1986
Publication title -
hydrological processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.222
H-Index - 161
eISSN - 1099-1085
pISSN - 0885-6087
DOI - 10.1002/hyp.3360010108
Subject(s) - piezometer , data logger , transducer , acoustics , signal (programming language) , data acquisition , current (fluid) , remote sensing , electronic circuit , hydrology (agriculture) , computer science , environmental science , geology , electrical engineering , engineering , geotechnical engineering , groundwater , physics , aquifer , programming language , operating system
A new concept in recording data from a large network of transducers in the field is described. Each transducer is equipped with an addressable switching unit enabling parallel connection by a single four wire cable and sequential interrogation from a micro‐computer controlled data logger. A simple water level transducer suitable for both large stilling wells and piezometers, which returns an audio frequency signal with pulse width proportional to water level, is described. The use of audio frequency signals enables telephone grade circuits to be used and avoids many of the problems associated with direct current signals, whether current or voltage, commonly used at present. A field installation of 30 piezometers, a tipping bucket raingauge, a weir‐stage recorder and logger controlled water sampler is described and examples given of the data collected from a single piezometer transect during a major storm event.