Abnormal Strain Induced by Heavy Rainfall on Borehole Strainmeters Observed in Taiwan
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 rainwate...
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MDPI AG
2021-02-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/3/1301 |
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| author | Chih-Yen Chen Jyr-Ching Hu Chi-Ching Liu Chun-Ying Chiu |
| author_facet | Chih-Yen Chen Jyr-Ching Hu Chi-Ching Liu Chun-Ying Chiu |
| author_sort | Chih-Yen Chen |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T06:15:26Z |
| format | Article |
| id | doaj.art-38fda6d7c46542ffa545fe9a360bb4c5 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T06:15:26Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj.art-38fda6d7c46542ffa545fe9a360bb4c52023-12-03T11:53:31ZengMDPI AGApplied Sciences2076-34172021-02-01113130110.3390/app11031301Abnormal Strain Induced by Heavy Rainfall on Borehole Strainmeters Observed in TaiwanChih-Yen Chen0Jyr-Ching Hu1Chi-Ching Liu2Chun-Ying Chiu3Central Geological Survey, Ministry of Economic Affairs, Taipei 10021, TaiwanDepartment of Geosciences, National Taiwan University, Taipei 10617, TaiwanInstitute of Earth Sciences, Academia Sinica, Taipei 11529, TaiwanDepartment of Geosciences, National Taiwan University, Taipei 10617, TaiwanWe 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.https://www.mdpi.com/2076-3417/11/3/1301borehole strainmeterrainfall induced strainrainfall quick responserainfall impact functiondebris flowlandslides |
| spellingShingle | Chih-Yen Chen Jyr-Ching Hu Chi-Ching Liu Chun-Ying Chiu Abnormal Strain Induced by Heavy Rainfall on Borehole Strainmeters Observed in Taiwan Applied Sciences borehole strainmeter rainfall induced strain rainfall quick response rainfall impact function debris flow landslides |
| title | Abnormal Strain Induced by Heavy Rainfall on Borehole Strainmeters Observed in Taiwan |
| title_full | Abnormal Strain Induced by Heavy Rainfall on Borehole Strainmeters Observed in Taiwan |
| title_fullStr | Abnormal Strain Induced by Heavy Rainfall on Borehole Strainmeters Observed in Taiwan |
| title_full_unstemmed | Abnormal Strain Induced by Heavy Rainfall on Borehole Strainmeters Observed in Taiwan |
| title_short | Abnormal Strain Induced by Heavy Rainfall on Borehole Strainmeters Observed in Taiwan |
| title_sort | abnormal strain induced by heavy rainfall on borehole strainmeters observed in taiwan |
| topic | borehole strainmeter rainfall induced strain rainfall quick response rainfall impact function debris flow landslides |
| url | https://www.mdpi.com/2076-3417/11/3/1301 |
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