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Article ; Online: Spatiotemporal Impact on Vegetation by Tunnel Discharging in the Jinping II Hydropower Station

Ci Song / Runqiu Huang / Xiaolu Tang

Frontiers in Earth Science, Vol

Evidence From the NDVI and GPP Monitoring Dataset of 2001–2019

2022 Volume 10

Abstract: An impact on vegetation by tunnel discharging has been a critical point for underground constructions around the world. The Jinping II hydropower station in China possesses the world’s largest karst diversion tunnel group and discharged massive ... ...

Abstract	An impact on vegetation by tunnel discharging has been a critical point for underground constructions around the world. The Jinping II hydropower station in China possesses the world’s largest karst diversion tunnel group and discharged massive groundwater during the construction period. This study assessed the effects on vegetation in the karst and non-karst areas at different stages before construction (2001–2003, BC), during construction (2004–2014, DC), and after construction (2015–2019, AC) based on the Normalized Difference Vegetation Index (NDVI) and the gross primary productivity (GPP) dataset of the moderate resolution-imaging spectroradiometer (MODIS). The regional median results of the NDVI and GPP showed that the whole vegetation was little changed by massive tunnel drainage throughout BC, DC, and AC. The NDVI and GPP were locally decreased in the first 3 years, and then recovered to the original level within next several years. Notably, the NDVI and GPP of the karst area (20 and 50% in the total area) were decreased more significantly than those of the non-karst area (8 and 20% in the total area). The factors controlling vegetation change are the development of karst and fractures, which are the conduits of groundwater flow. Therefore, massive groundwater discharge is the primary influence leading to the vegetation deterioration in the Jinping II hydropower station. The research would provide a vital reference for vegetation protection of large-scale underground construction in the world.
Keywords	groundwater discharging ; karst ; fracture ; vegetation ; spatiotemporal impact ; Jinping II hydropower station ; Science ; Q
Subject code	910
Language	English
Publishing date	2022-05-01T00:00:00Z
Publisher	Frontiers Media S.A.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Multi-Temporal Landslide Inventory-Based Statistical Susceptibility Modeling Associated With the 2017 Mw 6.5 Jiuzhaigou Earthquake, Sichuan, China

Luguang Luo / Xiangjun Pei / Chuangui Zhong / Qingwen Yang / Xuanmei Fan / Ling Zhu / Runqiu Huang

Frontiers in Environmental Science, Vol

2022 Volume 10

Abstract: The 2017 Mw 6.5 Jiuzhaigou earthquake (Sichuan, China) is the first strong ground motion that struck the famous world heritage site, causing widespread landslides and severe rock mass damage effects and landscapes undergoing rapid evolution in the ... ...

Abstract	The 2017 Mw 6.5 Jiuzhaigou earthquake (Sichuan, China) is the first strong ground motion that struck the famous world heritage site, causing widespread landslides and severe rock mass damage effects and landscapes undergoing rapid evolution in the Jiuzhaigou National Geopark. However, the understanding of the variability of pre- and post-earthquake landslide susceptibility and landslide conditioning factor effects over time remains limited. This study aims to carry out multi-temporal statistical landslide susceptibility modeling at the slope-unit level related to this event. To achieve this, we initially used a set of remote sensing imageries in GIS to obtain systematic landslide inventories across the pre-, co-, and post-seismic periods. Based on three landslide inventory datasets, we developed three statistical models by incorporating 14 landslide conditioning (seismic, topographic, and geologic) factors into a binary logistic regression (BLR) model. Finally, we utilized the area under the receiver operating characteristic (AUC) (QA) curve to assess each model’s calibration and validation performance. The results show that the BLR model has good prediction applicability for both normal and seismic landslides in the study area with outstanding to excellent predictive accuracy for Mod1 (pre-seismic, AUC = 0.801), Mod2 (co-seismic, AUC = 0.942), and Mod3 (post-seismic, AUC = 0.880) periods. There are variations in both the importance of landslide conditioning factors and susceptibility maps through time, and the number of slope units with a mean probability over 0.8 from only one (pre-seismic) increased to 21 (post-seismic). The dynamic susceptibility maps are of great significance for identifying potentially unstable slopes and providing references for hazard and risk assessment, which could provide new insights into geo-environmental protection and regional landslide evaluation in scenery spots, even for those world heritage sites in the tectonic active mountainous region. Moreover, more frequent or extended ...
Keywords	multi-temporal landslide inventory ; jiuzhaigou earthquake ; landslide susceptibility ; binary logistic regression ; slope unit ; world heritage site ; Environmental sciences ; GE1-350
Subject code	550
Language	English
Publishing date	2022-03-01T00:00:00Z
Publisher	Frontiers Media S.A.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Molecular simulation for the relationship between the functional groups of chemical admixtures and cement hydration product Ca (OH)2 in the grouting process

Zhihao He / Xiangjun Pei / Jiaxing Zhang / Runqiu Huang / Miao Deng / Yang Gao / Meiben Gao / Lin Xie

Ecological Indicators, Vol 153, Iss , Pp 110404- (2023)

2023

Abstract: Complex geological problems caused by natural environment have emerged constantly, causing serious damage to the land use and groundwater ecological environment in the western region. How to deal with the relationship between the above factors and ... ...

Abstract	Complex geological problems caused by natural environment have emerged constantly, causing serious damage to the land use and groundwater ecological environment in the western region. How to deal with the relationship between the above factors and ecological environment protection is a new research topic at present. Broken rock mass, cracks and water inrush during construction can be blocked and reinforced by grouting to achieve environmental protection. Therefore, to develop accurate quantitative models for the hydration of cement and predict the properties of grouting materials plays a crucial role during the protection process. In this study, the hydration product Ca(OH)2 is taken as an example, and the adsorption processes of different functional groups on the surface of Ca(OH)2 were investigated using DFT. The adsorption energy of the (101) surface was −0.38 Ha in sulfonic group, the lowest on different crystal planes of Ca(OH)2, while the adsorption energy of different functional groups is sulfonic group > carboxyl group > amide group > benzene ring. The adsorption energy was the lowest when the hydroxyl and carboxyl ratio was 1:1, suggesting that the adsorption energy and hydration performance in different ratios of hydroxyl and carboxyl groups will also be discrepant. After the adsorption of functional groups with Ca(OH)2, the electron clouds and orbitals rearranged, new characteristic peaks of the s orbital were present in the vicinity of −15 eV, −13 eV, and −10 eV, respectively. Since the relationship between functional groups and cement hydration process of chemical admixtures was explored, the mechanism of the cement hydration reaction and the influence of cement-based admixtures was revealed from an electronic view, also to extract the key influencing factors for the grouting and develop accurate quantitative models to predict and tackle various geo-environmental hazards.
Keywords	Land use ; Environment protection ; Hydrological response ; Hydration products ; Molecular simulation ; Ecology ; QH540-549.5
Subject code	541
Language	English
Publishing date	2023-09-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Recent Evolution of Coastal Tidal Flats and the Impacts of Intensified Human Activities in the Modern Radial Sand Ridges, East China

Yifei Zhao / Qing Liu / Runqiu Huang / Haichen Pan / Min Xu

International Journal of Environmental Research and Public Health, Vol 17, Iss 3191, p

2020 Volume 3191

Abstract: The coastal tidal flats of the modern Radial Sand Ridges (RSRs) are typical silt-muddy tidal flats in Central Jiangsu Province. These tidal flats play a critical role in coastline protection and biodiversity conservation, and against storm surges, but ... ...

Abstract	The coastal tidal flats of the modern Radial Sand Ridges (RSRs) are typical silt-muddy tidal flats in Central Jiangsu Province. These tidal flats play a critical role in coastline protection and biodiversity conservation, and against storm surges, but have recently been displaying drastic changes in geomorphic dynamics because of human activities. However, a comprehensive understanding of spatiotemporal changes in tidal flats in RSRs remains lacking. Hence, we employed a novel remote sensing method by obtaining the instantaneous high/low tide line positions from over 112 scenes of Landsat satellite images of the study area from 1975 to 2017, which were used to track the recent evolution of the coastal tidal flats in the modern RSRs over the past four decades. We found that the shoreline of the tidal flats showed an advanced seaward trend, and the waterline of the tidal flat presented a gradual process during different periods. The total tidal flat area in the study area showed an obviously decreasing trend overall, and approximately 992 km 2 of the tidal flat was lost. We also found that the coastal tidal flats in the modern RSRs were generally undergoing erosion in the low tidal flats, especially in the Northern Swing and Southern Swing areas, while the high tidal flats showed a slowed accretionary change. Land reclamation was the main factor affecting the reduction in the tidal flat area, as the reclamation area has increased by 1300 km 2 , with an average of 35.14 km 2 /year. In addition, the erosion of the tidal flats was associated with a reduced sediment supply. Our findings will provide useful information for local managers and researchers to support future environmental management because increasing demand for land and rising sea levels are expected in the future.
Keywords	tidal flats ; coastal revolution ; human activities ; modern radial sand ridges ; Medicine ; R
Subject code	710 ; 333
Language	English
Publishing date	2020-05-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Rainfall infiltration performance and its relation to mesoscopic structural properties of a gravelly soil slope

Dong, Hui / Qian-Feng Gao / Runqiu Huang

Engineering geology. 2017 Nov. 29, v. 230

2017

Abstract: Soil infiltration performances under rainfall affect shear strengths and play a crucial role in landslide problems. In this paper, the infiltration performances of gravelly soils under different rainfall conditions were investigated by 1D and 2D seepage ... ...

Abstract	Soil infiltration performances under rainfall affect shear strengths and play a crucial role in landslide problems. In this paper, the infiltration performances of gravelly soils under different rainfall conditions were investigated by 1D and 2D seepage tests. Computed tomography (CT) scans were adopted to identify the mesoscopic structural properties of gravelly soils. The significances of mesoscopic properties on the saturated coefficient of permeability (ks) were subsequently analyzed. The results showed a temporal and spatial variation of infiltration performances of a gravelly soil slope. The infiltration performances measured by 1D infiltration tests were different from those obtained from 2D tests. An exponential relationship between 1D and 2D infiltration rates was observed. The results further highlighted that void area ratio, uniformity coefficient, and gravel content were three most significant factors to ks. Three permeability formulas that respectively expressed by gravel content, initial dry density and two mesoscopic properties were proposed in this paper.
Keywords	computed tomography ; engineering ; gravel ; gravelly soils ; infiltration rate ; landslides ; permeability ; rain ; seepage
Language	English
Dates of publication	2017-1129
Size	p. 1-10.
Publishing place	Elsevier B.V.
Document type	Article
ISSN	0013-7952
DOI	10.1016/j.enggeo.2017.09.005
Database	NAL-Catalogue (AGRICOLA)

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Article: Some catastrophic landslides since the twentieth century in the southwest of China

Runqiu, Huang

Landslides. 2009 Mar., v. 6, no. 1

2009

Abstract: Landslides occur frequently in China. Especially, in the western part of China, large-scale landslides are notable for their scale, complex formation mechanism, and serious destruction. This paper presents some typical large-scale landslides that ... ...

Abstract	Landslides occur frequently in China. Especially, in the western part of China, large-scale landslides are notable for their scale, complex formation mechanism, and serious destruction. This paper presents some typical large-scale landslides that occurred in the southwest of China since the beginning of the twentieth century but were rarely reported worldwide. These cases represent different geological conditions and different triggering factors and mechanisms. The analysis shows that about 80% of large-scale landslides occurred in the first slope-descending zone along the eastern margin of Tibet Plateau, which is tectonically very active. The intensive interactions between the endogenic and epigenetic geological process cause serious dynamic change on the high steep slope and then result in the development of large-scale landslides. Strong earthquakes are also common in this area, and repetitive seismic activities make the slopes unstable and more vulnerable to failures. Besides earthquake, the area also experiences high rainfall, which is also responsible for triggering some of the large landslides.
Keywords	case studies ; China
Language	English
Dates of publication	2009-03
Size	p. 69-81.
Publisher	Springer-Verlag
Publishing place	Berlin/Heidelberg
Document type	Article
ZDB-ID	2141883-4
ISSN	1612-5118 ; 1612-510X
ISSN (online)	1612-5118
ISSN	1612-510X
DOI	10.1007/s10346-009-0142-y
Database	NAL-Catalogue (AGRICOLA)

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Article: Mechanics of the earthquake-induced Hongshiyan landslide in the 2014 Mw 6.2 Ludian earthquake, Yunnan, China

Luo, Jing / Runqiu Huang / Stephen G. Evans / Xiangjun Pei

Engineering geology. 2019 Mar. 09, v. 251

2019

Abstract: The Hongshiyan landslide, the largest landslide (volume ~ 12.24 Mm3) triggered by 2014 Mw 6.2 Ludian earthquake, blocked the Niulan river forming a rockslide dam; the failure potential of the dam created an elevated risk to population and infrastructure ... ...

Abstract	The Hongshiyan landslide, the largest landslide (volume ~ 12.24 Mm3) triggered by 2014 Mw 6.2 Ludian earthquake, blocked the Niulan river forming a rockslide dam; the failure potential of the dam created an elevated risk to population and infrastructure downstream. We provide insight into the failure mechanics of the Hongshiyan landslide using data obtained by means of remote sensing techniques and traditional in-situ surveys. Geological data obtained by these methods was then used for kinematic and numerical analyses. Our study shows that failure of the Hongshiyan landslide involved a high rock slope with an average slope of 55° and aspect of 185° SSW, in which the geological setting consists of an upper strong limestone slab and an underlying weak silty mudstone. The geological setting allowed the landslide to develop, as follows: i) the silty mudstone, due to its poor mechanical properties, was subject to ductile deformation under the compressive loading from the overlying strong limestone slabs; ii) a large number of release fractures in the limestone developed as a consequence of pre-failure progressive deformation in the underlying weak mudstone; iii) the oxidation and solution along steep joint walls in the upper limestone indicates that the joints are pathways that allow water ingress into the mudstone, further promoting the degradation of shear strength in this layer. Distinct element modelling (UDEC) was used to back analyse the failure mechanism and develop the geological model that best reproduced the Hongshiyan failure geometry. Results show that the failure surface consisted of two elements. The upper steeply dipping release surface formed along the slope-parallel steep cross joints defining a jointed, strong limestone slab, and the toe of the failure formed a curved failure surface through the ductile weak silty mudstone, underlying the limestone slab, independent of any discontinuities within it. The pre-failure observations and numerical analysis suggest that the Hongshiyan slope was in a state of marginal static stability prior to the earthquake as a result of pre-failure progressive deformation controlled by the shear strength of the underlying mudstone. Overall, the marginal pre-earthquake stability of the Hongshiyan slope, coupled with the strongest seismic loading, which the Hongshiyan slope has been historically subjected to, are the reasons why this moderate earthquake induced a large-scale catastrophic rock slope failure.
Keywords	deformation ; dipping ; earthquakes ; geometry ; geophysics ; infrastructure ; landslides ; limestone ; models ; mudstone ; oxidation ; remote sensing ; risk ; rivers ; rockfalls ; shear strength ; slabs ; surveys ; China
Language	English
Dates of publication	2019-0309
Size	p. 197-213.
Publishing place	Elsevier B.V.
Document type	Article
ISSN	0013-7952
DOI	10.1016/j.enggeo.2018.11.011
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: A Coupled Thermo-Hydro-Mechanical Model of Jointed Hard Rock for Compressed Air Energy Storage

Xiaoying Zhuang / Runqiu Huang / Chao Liang / Timon Rabczuk

Mathematical Problems in Engineering, Vol

2014 Volume 2014

Keywords	Mathematics ; QA1-939 ; Science ; Q ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Technology ; T
Language	English
Publishing date	2014-01-01T00:00:00Z
Publisher	Hindawi Publishing Corporation
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A Coupled Thermo-Hydro-Mechanical Model of Jointed Hard Rock for Compressed Air Energy Storage

Xiaoying Zhuang / Runqiu Huang / Chao Liang / Timon Rabczuk

Mathematical Problems in Engineering, Vol

2014 Volume 2014

Keywords	Mathematics ; QA1-939 ; Science ; Q ; DOAJ:Mathematics ; DOAJ:Mathematics and Statistics ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Technology ; T ; DOAJ:General and Civil Engineering ; DOAJ:Technology and Engineering
Language	English
Publishing date	2014-01-01T00:00:00Z
Publisher	Hindawi Publishing Corporation
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A Coupled Thermo-Hydro-Mechanical Model of Jointed Hard Rock for Compressed Air Energy Storage

Xiaoying Zhuang / Runqiu Huang / Chao Liang / Timon Rabczuk

Mathematical Problems in Engineering, Vol

2014 Volume 2014

Keywords	Mathematics ; QA1-939 ; Science ; Q ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Technology ; T
Language	English
Publishing date	2014-01-01T00:00:00Z
Publisher	Hindawi Publishing Corporation
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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