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Abnormal Strain Induced by Heavy Rainfall on Borehole Strainmeters Observed in Taiwan
- Source :
- Applied Sciences, Volume 11, Issue 3, Applied Sciences, Vol 11, Iss 1301, p 1301 (2021)
- Publication Year :
- 2021
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2021.
-
Abstract
- We found some obvious abnormal strain induced by heavy rainfall from borehole strainmeters deployed in Western Taiwan. The strain induced by rainfall can be divided into two parts, one is the quick response for extra loads of rainwater on the ground, and another one is the slow response for rainwater infiltrating into the strata. The quick and slow rainfall responses of areal strain data are analyzed using the technique of recursive digital filtering. Moreover, the rainfall impact functions of the studied stations are calculated using deconvolution. We found, in most cases, the response strain will reach the maximum in half an hour after heavy rainfall, and then show an exponential decay, it might persist more than 200 h depending on the hydrogeological condition around the station. Whereas the river flowing beside the station will help accelerating the runoff dispersion and reducing rainfall decay time in the hill or mountain region. We also compare the results after calibration in term of isotropic and vertical coupling individually. We found that the response strains are smaller in vertical coupling rather than isotropic coupling. The effects of debris avalanches caused by intensive rainfall in the mountain areas can be viewed as two types of rock deformation: generated only under the influence of rainfall and generated by the increased load in the river channels due to rainfall-induced landslides or debris flow. When the cumulative rainfall exceeds a certain threshold, the strain response curves show a noticeable anomaly likely due to the effects of the debris flow events in places prone to landslides.
- Subjects :
- 010504 meteorology & atmospheric sciences
Borehole
Soil science
010502 geochemistry & geophysics
01 natural sciences
lcsh:Technology
rainfall induced strain
Debris flow
lcsh:Chemistry
debris flow
General Materials Science
rainfall quick response
Dispersion (water waves)
Instrumentation
lcsh:QH301-705.5
rainfall impact function
0105 earth and related environmental sciences
Fluid Flow and Transfer Processes
landslides
Hydrogeology
lcsh:T
Process Chemistry and Technology
Anomaly (natural sciences)
General Engineering
Landslide
Debris
lcsh:QC1-999
Computer Science Applications
lcsh:Biology (General)
lcsh:QD1-999
lcsh:TA1-2040
borehole strainmeter
Surface runoff
lcsh:Engineering (General). Civil engineering (General)
Geology
lcsh:Physics
Subjects
Details
- Language :
- English
- ISSN :
- 20763417
- Database :
- OpenAIRE
- Journal :
- Applied Sciences
- Accession number :
- edsair.doi.dedup.....32b2ee47aa47d3e51b0af5ab36e93e33
- Full Text :
- https://doi.org/10.3390/app11031301