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The impact of gold mining activities: understanding the dynamics of cyanide in river ecosystems in Ecuador

Environmental Science and Pollution Research 2024年第56期31卷 64509-64523页

作者： Arellano-Yasaca, Diana Victoria Chu, Chen-Yeon Hoang, Thanh-Van Program for Infrastructure Planning and Engineering Feng Chia University Taichung40724 Taiwan Program for Civil Engineering Water Resources Engineering and Infrastructure Planning Feng Chia University Taichung40724 Taiwan Institute of Green Products Feng Chia University Taichung40724 Taiwan

Understanding the behavior of cyanide in rivers is of utmost importance as it has a direct impact on the health of people who depend on these water sources. Cyanide contamination from gold mining activities poses a significant environmental threat to river ecosystems, particularly in southern Ecuador. This study aimed to investigate the behavior of cyanide when it enters contact with other metals in these rivers. Simulations were conducted to determine the speciation of cyanide, mercury, arsenic, lead, and manganese in a study area, taking into account the water temperature and pH at four locations. The findings revealed that CN−and HCN(aq) species were present in the research area. Additionally, mercury-cyanide (Hg(CN)2(aq), Hg(CN)3−), and manganese-cyanide (MnCN+) complexes were identified 3 km downriver from the site where the mining activity is higher. These metal-cyanide complexes tend to dissociate quickly under weak acidic conditions, making them hazardous to the environment. This research is crucial, not only for the environment but also for human health, as it allows to predict toxicity risks for people supplied with this water source, emphasizing the potential harm to human health. This study highlights the importance of stringent regulations and effective monitoring practices to mitigate cyanide contamination and safeguard environmental and occupational health. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： River pollution

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NUMERICAL ANALYSIS OF SHAPE AND DEPTH FACTORS OF PERFECTLY ROUGH OR SMOOTH SHALLOW FOOTINGS ON AN INHOMOGENEOUS SINGLE LAYER OR INTERFACE OF TWO-LAYERED COHESIVE SOILS

Journal of GeoEngineering

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Journal of Geoengineering 2023年第2期18卷 59-69页

作者： Chi, Chao-Ming Lin, Zheng-Shan Department of Civil Engineering Feng Chia University Xitun Dist Taichung Taiwan Program for Infrastructure Planning and Engineering Feng Chia University Xitun Dist Taichung Taiwan

This study utilizes an explicit finite difference program to investigate the effect of circular shape, embedment depth, and footing roughness to the bearing capacity of large shallow foundations placed on an inhomogeneous cohesive single layer soil deposit or set on the interface of a two-layered cohesive soil system. Because the dimensions of offshore foundations are in general larger than those of onshore footings, the inhomogeneous and layered soil effect to the bearing capacity would be more significant. Moreover, many large foundations are usually circular metal footings, such as spudcan footings of jack-up barges, so the considerations of shape and roughness effect are necessary. In this study, the soil is modelled by a perfectly plastic material with Tresca yield criterion and the associated flow rule. When a kinematically admissible velocity field which satisfies the constraints imposed by compatibility, velocity boundary and the flow rule is determined, the numerically collapse load can be obtained. The results from numerical simulations indicate that the bearing capacity is associated with the pattern of soil plastic flow and affected by the foundation shape, footing roughness, embedment ratio, soil strength ratio, and inhomogeneity factor. According to the numerical simulation results, several regression equations are recommended for the circular shape factor and depth factor with footing roughness consideration, so engineers can utilize those to fast calculate the bearing capacity of a footing on an inhomogeneous single layer soil deposit or a two-layered cohesive soil system. The results also indicate that even though the embedment depth benefits the bearing capacity, the effectiveness of stronger top soil layer is more significant because the associated soil plastic flow range enlarges. © 2023, Journal of Geoengineering. All Rights Reserved.

关键词： Soils

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Streets, density, and the superblock: neighborhood planning units and street connectivity in Abu Dhabi

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Journal of Urbanism 2023年第2期16卷 168-195页

作者： Alawadi, Khaled Hong Nguyen, Ngoc Alrubaei, Eiman Scoppa, Martin Department of Civil Infrastructure and Environmental Engineering Sustainable Critical Infrastructure Program Khalifa University Abu Dhabi United Arab Emirates Faculty of Architecture The University of Danang-University of Science and Technology Danang Viet Nam Sustainable Critical Infrastructure Program Department of Civil Infrastructure and Environmental Engineering Khalifa University Abu Dhabi United Arab Emirates Architecture Engineering Department College of Engineering United Arab Emirates University Alain United Arab Emirates

This article studies the efficiency of street networks of Neighborhood Planning Units. Pedestrian Route Directness quantified the NPUs’ efficiency. The sample includes ten Abu Dhabi NPUs built during two periods: pre-1990 and post-1990. Two scenarios are assessed. First, as-built streets are evaluated based on the PRD test. Second, PRD values of NPUs with different plot densities are compared. Results show that plot density does not affect efficiency. A good network design produces high efficiency regardless of its plot density. The effects of streets on efficiency were further revealed by Betweenness. Combining PRD and Betweenness yields important principles of network design. This method can be applied to assess the connectivity of streets in different contexts. Future research should focus on: How do alleys contribute to the efficiency of NPUs? How do street configurations influence the behavior of movement? And how should NPUs be evaluated as local street systems with global implications?. © 2021 Informa UK Limited, trading as Taylor & Francis Group.

关键词： betweenness density neighborhood planning units pedestrian route directness Street connectivity

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Enhanced fish species classification using dynamic multilayer perceptron and transformer encoders with extra distribution data

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Multimedia Tools and Applications 2024年 1-30页

作者： Chen, Mei-Hsin Lai, Ting-Hsuan Chen, Yao-Chung Chou, Tien-Yin Ph.D. Program for Infrastructure Planning and Engineering Feng Chia University Taichung40724 Taiwan GIS Research Center Feng Chia University Taichung40724 Taiwan

This study introduces an innovative integrative framework for fine-grained fish species classification, significantly enhancing recognition accuracy by leveraging multimodal features. We combine Transformer Encoder and Dynamic Multilayer Perceptron to fuse image features with geospatial information. Utilizing data from the Taiwan Fish Database, our method not only utilizes photographs of fish and their capture locations but also incorporates non-photo extra fish distribution survey data. Initially, using only photographs, the model achieved an accuracy of 0.7433. By adding geospatial data, accuracy increased to 0.7731, marking a 3.93% improvement over the baseline. The integration of additional fish distribution data further boosted accuracy to 0.8000, an overall enhancement of 6.2% compared to the baseline. This approach underscores the potential of combining photo-included geospatial information with extra distribution data in fine-grained image classification tasks, thereby making a significant contribution to both scientific research and practical applications in the field. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

关键词： Photography

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Rockfall Mitigation for Highway in Vietnam: A Case Study on the Hoang Sa Road, Da Nang City 4th

Rockfall Mitigation for Highway in Vietnam: A Case Study on ...

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Proceedings of the 4th International Conference on Sustainability in Civil engineering - ICSCE 2022

作者： Naing, Cho Thu Thu Nguyen, Lan Chau Nguyen, Tien Dung Infrastructure Engineering Program VNU Vietnam Japan University Hanoi Viet Nam University of Transportation and Communications/UTC Hanoi Viet Nam

ISBN: (纸本)9789819923441

This paper presents a study on mitigating the impacts of rockfall on the Hoang Sa road, a coastal route to Son Tra peninsula, Da Nang city. Son Tra peninsula is very well-known for tourist attraction places. The Hoang Sa road is located in mountainous terrain. Rockfall events had occurred along this highway several times in the past. As a result, it affected the tourism sector and damaged the road infrastructure in Da Nang city. In this study, UAV was used to investigate the rockfall-prone area. According to the field survey, there were many large tectonic fractures and unstable blocks on the rock cliff along the Hoang Sa road. This paper focused on the mechanism of rockfall in a high-risk rockfall area on the Hoang Sa road and determined a suitable barrier location and height using parameters such as run-out distance, bounce height, velocity, and kinetic energy of the falling rock blocks with the RocFall software. The numerical analysis indicated that the appropriate barrier location and height for this area were at 14.5 and 5 m, with a kinetic energy of 590 kJ. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Slope stability

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Remedy Solutions for a Deep-Seated Landslide on Road No. 155, Section Km 12 + 667.85–Km 12 + 711.57, Sapa Town, Lao Cai Province, Vietnam 4th

Remedy Solutions for a Deep-Seated Landslide on Road No. 155...

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Proceedings of the 4th International Conference on Sustainability in Civil engineering - ICSCE 2022

作者： Aung, Thu Zar Nguyen, Lan Chau Nguyen, Tien Dung Infrastructure Engineering Program VNU Vietnam Japan University Hanoi Viet Nam University of Transportation and Communications UTC Hanoi Viet Nam

ISBN: (纸本)9789819923441

Landslide hazards are geological disasters caused by heavy rainfall and debris flow, mainly occurring in mountainous regions. This paper presents remedy solutions for a deep-seated landslide on Road No. 155, section Km 12 + 667.85–Km 12 + 711.57, near a new Mong Sen bridge in Sapa town, Lao Cai province. In October 2020, two deep-seated landslides occurred in this area with some serious cracks. The landslide area was divided into two zones: zones 1 and 2, and up to date, these two zones have still been under reinforcement. While these two zones were reinforced with the retaining structure, soil nails, and grounded anchor system, a landslide (named Zone 3) happened in the area between Zones 1 and 2, where soil erosion and water erosion appeared serious because of heavy rainfall and cutting slopes. In this study, geological investigations, laboratory tests, topographical features, hydrological features, and stability analysis (Geo-Slope/W software) were studied and analyzed to understand the failure mechanism. Then, mitigation solutions such as the retaining wall with the ground anchors, drainage pipe, and soil nails were proposed for the reinforcement. The analysis results showed that the sliding surface of the entire landslide body and the behavior of the new cut slope, with and without reinforcement structures, were based on the numerical analysis by Geo-Slope/W software. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Landslides

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Navigating Legal Frameworks for National Resilience: A Comparative Analysis of Key Disaster Management Laws in Thailand and Japan 4

Navigating Legal Frameworks for National Resilience: A Compa...

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4th International Symposium on Instrumentation, Control, Artificial Intelligence, and Robotics, ICA-SYMP 2025

作者： Laosunthara, Ampan Thongthip, Ratchaneekorn Krutphong, Kodchakorn School of Environment and Society Institute of Science Tokyo Tokyo Japan Disaster Preparedness Mitigation and Management Department of Civil & Infrastructure Engineering Pathumthani Thailand Environmental Engineering and Disaster Management Program Mahidol University Kanchanaburi Thailand

ISBN: (纸本)9798331505400

This study compares the disaster management laws of Thailand and Japan. The research reveals significant differences in legislative approaches, reflecting each country's unique historical, and governance contexts. Japan's law demonstrates a more comprehensive approach to the disaster management cycle and stakeholder involvement, with integrated financial provisions. Thailand's law emphasizes organizational aspects. Both prioritize response measures but show potential gaps in addressing preparedness and mitigation phases. The study identifies areas for further investigation, including financial measures, and international cooperation approaches. This comparative analysis offers valuable insights into both countries' ongoing development of disaster management systems and highlights potential areas for mutual learning and improvement in disaster risk reduction strategies. Creating resilience in the society through the core of the government working and stakeholders' given authorities. © 2025 IEEE.

关键词： Disaster prevention

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Syntactic analysis of traditional houses in urban kampung

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Built Heritage 2024年第3期8卷 156-174页

作者： Nova Asriana Rendy Perdana Khidmat Meldo Andi Jaya Verarisa Anastasia Ujung Widi Dwi Satria Riza Andriani Architecture Study Program Faculty of Infrastructure and Regional TechnologyInstitut Teknologi SumateraJalan Terusan RyacuduKecamatan Jati AgungKabupaten Lampung SelatanLampung 35365Indonesia Architecture Study Program Faculty of EngineeringUniversitas Muhammadiyah PalembangPalembang 30263Indonesia Heritage Community Palembang 30151Indonesia

This research investigates a syntactical study and comparative analysis of the statistical and spatial characteristics of traditional houses in an urban kampung settlement,focusing on a selected case study built by a participatory Arabic community in Palembang,South Sumatra,*** research aims to determine a formal rule basis for spatial confgurations to reveal identical sociospatial structures based on syntactical *** experiment measures spatial layout variation through space syntax analysis to provide a better understand of how the correlation between spatial confguration and sociospatial structures in traditional houses can be *** syntactical analysis applies four distinctive procedures:a selected case study,data collection,statistical and graphical analysis,and graph *** results indicate that the spatiality of all traditional houses in this kampung settlement highlights the spatial hierarchy order as a formal rule-based system,and approximately an average of 10%of this community is concerned with designing intelligible *** Batu and other dwellings have a similarity and *** main dwelling’s function involves more steps to separate public and private functional rooms,but a functional transformation from a dwelling into a public facility creates a short distance for easy access by ***,this separation afects occupants,especially in terms of spatial distribution activities,movement fows,and other social *** approach provides practical and tangible benefts for preservation values related to buildings;this strategy may also change how buildings are perceived in other built environments.

关键词： Syntactical analysis Traditional housing Urban kampung Space syntax

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Mechanical Performance Improvement by Carbon Dioxide Curing of Cement Concrete Incorporating Oil Shale Residue 1st

Mechanical Performance Improvement by Carbon Dioxide Curing ...

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1st International Conference on Emerging Smart Cities, ICESC 2022

作者： Syuhada, Syahidus Al Salaheen, Marsail Alaloul, Wesam Salah Alzubi, Khalid Mhmoud Civil Engineering Study Program Department of Infrastructure Technology and Planning Institut Teknologi Sumatera Sumatera Indonesia Department of Civil and Environmental Engineering Universiti Teknologi PETRONAS Seri Iskandar Malaysia Department of Civil and Environmental Engineering Al-Husun University College Irbid Jordan

ISBN: (纸本)9789819911103

The influence of carbon dioxide (CO2) curing on the compressive strength of oil shale ash (OSA) concrete as partial cement replacement was investigated. 15 cm cubes with a 30% replacement percentage were tested after seven days of conventional curing and carbonation curing at 4 bar CO2 pressure. Research results demonstrate that CO2 curing influences the compressive strength of concrete significantly. There is a linear relationship between CO2 pressure and the duration of curing, as well as the compressive strength of OSA-based concrete. A sample of ordinary Portland cement was used as the control sample. The replacement of 30% cement by OSA increased the 7-day compressive strength from 48.5 to 55.5 MPa for plain cement samples and from 36.5 to 42.3 MPa for ash-based samples. From a technical standpoint, OSA-based concrete carbonation curing is still too immature for widespread application. Nonetheless, it is continuously developing in response to greenhouse gas reduction and paving the path for a more sustainable construction materials business. © 2024, Institute of Technology PETRONAS Sdn Bhd.

关键词： Carbon dioxide

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Controlled diesel-mixed soils for roadway embankments: laboratory and ultrasonic characterization

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Arabian Journal of Geosciences 2023年第5期16卷 1-12页

作者： AbdelSalam, Sherif S. Hasan, Ahmed M. M. Civil and Infrastructure Engineering and Management Program School of Engineering and Applied Science Nile University Giza Egypt

Soils contaminated with hydrocarbons is a repetitive site condition that may occur at locations adjacent to underground fuel tanks and other facilities. The main purpose of this study is to characterize and assess possibilities of reusing contaminated soil in useful applications such as roadway embankments. Accordingly, controlled amounts of diesel were mixed with clays and sands using percentages ranging from 0 to 13.5%. Unconfined compression, direct shear, California bearing ratio, and other tests were conducted on the diesel-mixed soil, along with the ultrasonic test. The ultrasonic test provided measures for the pulse wave velocity and received frequency, which was correlated with other soil parameters such as elastic modulus, resilient modulus, and California bearing ratio. From the main outcomes, it was found that small amounts of diesel can help improved soil shear strength. For instance, adding 5% diesel increased the soil cohesion by 63% and the unconfined compressive strength from 0.14 to 0.21 N/mm2. In sands, the California bearing ratio increased by almost double by adding 5% diesel, which is essential for roadway embankments especially in remote locations. Damping coefficient of soil was determined at different levels of diesel using the ultrasonic wave decay envelops. The ultrasonic waves were analyzed using fast Fourier transform to determine useful correlations between the wave frequency and the diesel content starting from 0 to 13.5%, and it was realized that an uncomplicated ultrasonic test can be acceptably used to assess static and dynamic properties of clean as well as contaminated soils.

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