Fuzzy Linear Regression of Rainfall-Altitude Relationship

Tzimopoulos, Christos; Evangelides, Christos; Vrekos, C.; Samarinas, Nikiforos

doi:10.3390/proceedings2110636

“…Our rainfall data are taken from lower altitudes than that of the study site, while debris flows usually form at higher elevations. Studies show that higher rainfall occurs at higher elevations (Zhou et al 2019, Tzimopoulos et al 2018. Therefore, our rainfall data cannot represent the actual rainfall that triggered the "8.20" debris flow.…”

Section: Parameter Calculatingmentioning

confidence: 87%

Characteristics of the Disastrous Debris Flow of Chediguan Gully in Yinxing Town, Sichuan Province, on August 20, 2019

Li

¹

,

Tang

²

,

Zhang

³

et al. 2021

Preprint

0

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On August 20, 2019, at 2 a.m., a disastrous debris flow occurred in Chediguan gully in Yinxing town, China. The debris flow destroyed the drainage groove and the bridge at the exit of the gully. In addition, the debris flow temporarily blocked the Minjiang River during the flood peak, flooding the Taipingyi hydropower station 200 m upstream and leaving two plant workers missing. To further understand the activity of the debris flow after the Wenchuan earthquake, the characteristics of this debris flow event were studied. Eleven years after the Wenchuan earthquake, a disastrous debris flow still occurred in the Chediguan catchment, causing more severe losses than those of earlier debris flows. In this paper, the formation mechanism and dynamic characteristics of this debris flow event are analysed based on a drone survey, high-definition remote sensing interpretations and other means. The catastrophic debris flow event indicates that debris flows in the Wenchuan earthquake area are still active. A large amount of dredging work in the main gully could effectively reduce the debris flow risk in the gully. In addition, it is also important to repair or rebuild damaged mitigation measures and to establish a real-time monitoring and early warning system for the high-risk gully.

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“…Our rainfall data are taken from lower altitudes than that of the study site, while debris flows usually form at higher elevations. Studies show that higher rainfall occurs at higher elevations 22 , 23 . Therefore, our rainfall data cannot represent the actual rainfall that triggered the "8.20" debris flow.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of the disastrous debris flow of Chediguan gully in Yinxing town, Sichuan Province, on August 20, 2019

Li

¹

,

Tang

²

,

Zhang

³

et al. 2021

Sci Rep

View full text Add to dashboard Cite

On August 20, 2019, at 2 a.m., a disastrous debris flow occurred in Chediguan gully in Yinxing town, China. The debris flow destroyed the drainage groove and the bridge at the exit of the gully. In addition, the debris flow temporarily blocked the Minjiang River during the flood peak, flooding the Taipingyi hydropower station 200 m upstream and leaving two plant workers missing. To further understand the activity of the debris flow after the Wenchuan earthquake, the characteristics of this debris flow event were studied. Eleven years after the Wenchuan earthquake, a disastrous debris flow still occurred in the Chediguan catchment, causing more severe losses than those of earlier debris flows. In this paper, the formation mechanism and dynamic characteristics of this debris flow event are analysed based on a drone survey, high-definition remote sensing interpretations and other means. The catastrophic debris flow event indicates that debris flows in the Wenchuan earthquake area are still active. A large amount of dredging work in the main gully could effectively reduce the debris flow risk in the gully. In addition, it is also important to repair or rebuild damaged mitigation measures and to establish a real-time monitoring and early warning system for the high-risk gully.

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“…In general, fuzzy methodology has already been recognized as an innovative approach to handling problem uncertainties with several works in different scientific fields [59][60][61][62][63] but to our knowledge, a limited number of studies have been published recently concerning fuzzy FEM models and are mainly in structural mechanics [31,[64][65][66][67].…”

Section: Introductionmentioning

confidence: 99%

Fuzzy Finite Elements Solution Describing Recession Flow in Unconfined Aquifers

Tzimopoulos,

Papadopoulos,

Samarinas

et al. 2024

Hydrology

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In this work, a novel fuzzy FEM (Finite Elements Method) numerical solution describing the recession flow in unconfined aquifers is proposed. In general, recession flow and drainage problems can be described by the nonlinear Boussinesq equation, while the introduced hydraulic parameters (Conductivity K and Porosity S) present significant uncertainties for various reasons (e.g., spatial distribution, human errors, etc.). Considering the general lack of in situ measurements for these parameters as well as the certain spatial variability that they present in field scales, a fuzzy approach was adopted to include the problem uncertainties and cover the disadvantage of ground truth missing data. The overall problem is encountered with a new approximate fuzzy FEM numerical solution, leading to a system of crisp boundary value problems. To prove the validity and efficiency of the new fuzzy FEM, a comparative analysis between the proposed approach and other well-known and tested approximations was carried out. According to the results, the proposed FEM numerical solution agrees with Karadinumerical method for the crisp case and is in close agreement with the original analytical solution proposed by Boussinesq in 1904 with the absolute reduced error to be 4.6‰. Additionally, the possibility theory is applied, enabling the engineers and designers of irrigation, drainage, and water resources projects to gain knowledge of hydraulic properties (e.g., water level, outflow volume) and make the right decisions for rational and productive engineering studies.

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Fuzzy Linear Regression of Rainfall-Altitude Relationship

Cited by 7 publications

References 18 publications

Characteristics of the Disastrous Debris Flow of Chediguan Gully in Yinxing Town, Sichuan Province, on August 20, 2019

Characteristics of the Disastrous Debris Flow of Chediguan Gully in Yinxing Town, Sichuan Province, on August 20, 2019

Characteristics of the disastrous debris flow of Chediguan gully in Yinxing town, Sichuan Province, on August 20, 2019

Fuzzy Finite Elements Solution Describing Recession Flow in Unconfined Aquifers

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