Vulnerability analysis method of vegetation due to groundwater table drawdown induced by tunnel drainage

Gokdemir, Cagri; Rubin, Yoram; Li, Xiaojun; Li, Yandong; Xu, Hao

doi:10.1016/j.advwatres.2019.103406

Cited by 18 publications

(5 citation statements)

References 57 publications

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“…Por otra parte, la extracción de agua implica una reducción del nivel de la napa freática (Elmore et al, 2006;Guirado et al, 2019), ocasionando la reducción de la cobertura vegetal (Huang et al, 2019), particularmente de las especies con raíces superficiales (Elmore et al, 2006). Sin embargo, este efecto se ve afectado por la textura de los suelos; de modo que, texturas finas de suelo implican una mayor retención de agua proveniente de las precipitaciones (Gokdemir et al, 2019); y, por lo tanto, un menor efecto de la disminución de la nata freática. Por otra parte, la disminución de la napa freática desencadena un proceso de oxidación de la biomasa que típicamente se acumula en los bofedales, conllevando al incremento de la emisión de gases de efecto invernadero (Humpenöder et al, 2020).…”

Section: Discussionunclassified

Análisis multitemporal de la laguna Suches y del vigor de la vegetación del bofedal de Huaytire, Tacna

Franco

Bahamontes

2021

C&D

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La laguna Suches y el bofedal de Huaytire, ubicados en la provincia de Candarave del departamento de Tacna, son ecosistemas importantes que brindan diversos servicios ecosistémicos. En esta investigación, se determinó el cambio del área del espejo de agua de la laguna Suches y el cambio de los valores de NDVI del bofedal de Huaytire entre los años 1975 a 2020, mediante el análisis de imágenes satelitales obtenidas del Servicio Geológico de los Estados Unidos – USGS (Landsat 2, Landsat 5, Landsat 7 y Landsat 8). Se calculó el Índice Normalizado Diferencial de Vegetación (NDVI) y el Índice Diferencial de Agua Normalizado (NDWI). Los resultados evidencian una disminución notable del área de la laguna Suches y del vigor de la vegetación, este último indicando una disminución de la cobertura del bofedal de Huaytire. Aunque, no fue posible establecer una relación causal con los factores que estarían ocasionando tal disminución, la evidencia científica revisada sugiere que el cambio climático, la derivación y extracción de agua superficial y subterránea; así como, el pastoreo de ganado camélido, serían las causantes de los resultados encontrados.

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Section: Discussionunclassified

Análisis multitemporal de la laguna Suches y del vigor de la vegetación del bofedal de Huaytire, Tacna

Franco

Bahamontes

2021

C&D

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“…Its root width exceeds twice the crown diameter, and more than 85% of fine roots are distributed in the soil layer of 10.00-60.00 cm. Therefore, in the calculation, the root zone of the plant was distributed within 0-70.00 cm below the surface [40], b was taken as 2, R avg was taken as 0.1 [41], and the canopy interception constant 4.…”

Section: Model Parameter Determinationmentioning

confidence: 99%

Effect of groundwater decline on plant induced by tunnel excavation and calculation of ecological water level based on SPAC model

Liu,

Zhuang,

Zhou

et al. 2024

Journal of Intelligent Construction

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Keywordsgroundwater decline ecological water level SPAC model plant wiltDuring the excavation of tunnels in mountainous areas, groundwater may be lost, which affects the surface plants and ecology. In this article, taking Hengwu Tunnel in China as an example, based on the soil-plant-atmosphere continuum (SPAC) model, the relevant parameters were obtained by field test first, and then from the perspective of soil water matrix potential (SWMP) and soil water migration (SWM), the effect of groundwater level decline induced by mountain tunnel excavation on plant growth was studied, and the calculation method of ecological water level was put forward. The results show the following: (1) The wilting of plant roots is a dynamic process of gradual expansion from the middle of the root to both ends, and the response of SWMP in the root region to changes in atmosphere and groundwater level is lagging and non-uniform; (2) SWMP can be used to predict the degree of wilting of plant roots, while the final distribution and value of SWMP are only related to the position of the groundwater level, but not related to the decline rate of the groundwater level; (3) groundwater level and rainfall (P) will affect the value and proportion of each flux in the SPAC model, in which the relative transpiration ratio can be used to evaluate the growth of the plant and calculate the ecological water level of the plant.

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“…e Gongbei tunnel is close to the sea with a large cross section and poor engineering geology. If the drainage principle or the limited drainage principle is adopted, the water will carry away the fine soil particles, which will lead to a cavity behind the tunnel lining, affect the long-term safety of the tunnel, and also have a certain impact on the surrounding environment of the tunnel [26][27][28]. In addition, if the drainage principle or the limited drainage principle is adopted, the tunnel drainage capacity should be higher; however, the water discharge of the tunnel is large and the water source is stable, so the underground water in the tunnel cannot be drained [29,30].…”

Section: Waterproof and Drainage System Of The Gongbei Tunnelmentioning

confidence: 99%

Discussion on the Waterproof and Drainage System of the Coastal Tunnel and Analysis of Water Pressure Law outside Lining: A Case Study of the Gongbei Tunnel

Zhao

Tan

Zhou

2021

Advances in Civil Engineering

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With the orderly promotion of the infrastructure construction in China, the number of coastal tunnels is increasing, but the coastal environment is accompanied by a large amount of groundwater and the designs of the waterproof and drainage system of coastal tunnels have always been a hot topic in the industry. If the waterproof and drainage system designs of the coastal tunnels are improper, the tunnel structure will easily be damaged and the stability and service life of the whole project will be affected. Based on the Gongbei tunnel project of the Hong Kong-Zhuhai-Macao Bridge, this paper discusses the designs of the waterproof and drainage system, and the waterproof detail structures of the Gongbei tunnel. Indoor similarity tests were carried out to study the law of the free water discharge of the tunnel under variable water heads, the relationship between the water pressure outside the lining and the water discharge, the relationship between the water pressure outside the pipe roof and the water discharge, and the distribution of water pressure around the tunnel. The reliability of the indoor similarity test was verified by the field test. The results show that the whole waterproof system should be adopted in the Gongbei tunnel, that is, grouting ring + pipe roof freezing ring + initial lining + waterproof board + tertiary lining. In a certain range, the greater the water head, the greater the free water discharge of the tunnel. When the water head is large, the free drainage tends to a fixed value. When the tunnel is completely plugged, the water pressure outside the tunnel is distributed from the hydrostatic pressure. When the tunnel adopts drainage measures, the water pressure outside the lining will be reduced to a certain extent even the water discharge is very small. The above research can provide a reference for the design of the waterproof and drainage system similar to the coastal tunnel in the future.

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Vulnerability analysis method of vegetation due to groundwater table drawdown induced by tunnel drainage

Cited by 18 publications

References 57 publications

Análisis multitemporal de la laguna Suches y del vigor de la vegetación del bofedal de Huaytire, Tacna

Análisis multitemporal de la laguna Suches y del vigor de la vegetación del bofedal de Huaytire, Tacna

Effect of groundwater decline on plant induced by tunnel excavation and calculation of ecological water level based on SPAC model

Discussion on the Waterproof and Drainage System of the Coastal Tunnel and Analysis of Water Pressure Law outside Lining: A Case Study of the Gongbei Tunnel

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