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Assessing the Performance of Machine Learning Algorithms for Water Level Prediction in the Chao Phraya River and its Tributaries: A Focus on Low and High Water Levels

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SSRN 2024年

作者： Priyasiri, Wilmat D.S.M. Rittima, Areeya Kraisangka, Jidapa Sawangphol, Wudhichart Phankamolsil, Yutthana Talaluxmana, Yutthana Graduate Program in Environmental and Water Resources Engineering Department of Civil and Environmental Engineering Faculty of Engineering Mahidol University Thailand Faculty of Information and Communication Technology Mahidol University Thailand Environmental Engineering and Disaster Management Program Mahidol University Kanchanaburi Campus Thailand Department of Water Resources Engineering Faculty of Engineering Kasetsart University Thailand

High precision of hydrological prediction is crucial for real–time operation of flood and drought risk mitigation and strategic planning. This study assessed the predictive performances of three Machine Learning (ML) algorithms;XGBoost, Random Forest (RF), and Multi–Layer Neural Networks (MLNNs) for water level prediction with a focus on low and high water levels. The one–day and one–week water level prediction models for six key gauged stations along the Chao Phraya River and its major tributaries were accordingly developed. Selecting the combination of input features was carried out and structured in the prediction model at all gauged stations based on the physical river–reservoir system using past water level, rainfall, controlled reservoir outflow, and upstream discharges with different travel times. The statistical evaluation indicated that both XGBoost and RF, the tree–based ML models, with rainfall input robustly outperformed than MLNNs, as it strongly achieved higher R2 from 0.957 to 0.999 for model training and from 0.743 to 0.995 for model testing and lower MAE, MSE, and RMSE values for all prediction scenarios. Among these three ML algorithms applied for daily prediction, RF demonstrated the superior performance for low water level prediction exhibiting the smallest percentage error of overestimating lying between +0.0088% and +0.9380%. XGBoost, RF, and MLNNs, demonstrated acceptable performance level for high water level prediction as it shows small percentage error of both overestimating and underestimating lying between –2.2696% and +1.1587%. Additionally, it can capture the entire testing dataset with high precision than weekly model. © 2024, The Authors. All rights reserved.

关键词： Rain

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Projection of climate change effects on flood inundation in the Gin River basin, Sri Lanka 9

Projection of climate change effects on flood inundation in ...

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9th International Conference on Flood Management, ICFM 2023

作者： Jayapadma, Jayapadma Mudalige Miyuru Uthpala Souma, Kazuyoshi Ishidaira, Hiroshi Magome, Jun Wickramaarachchi, Thushara Navodani Special Educational Program on River Basin Environmental Science Integrated Graduate School of Medicine Engineering and Agricultural Sciences University of Yamanashi 4-3-11 Takeda Yamanashi Kofu400-8511 Japan Interdisciplinary Centre for River Basin Environment University of Yamanashi 4-3-11 Takeda Yamanashi Kofu400-8511 Japan Department of Civil and Environmental Engineering Faculty of Engineering University of Ruhuna Galle Hapugala Sri Lanka

Human-induced climate change has altered the frequency and severity of heavy precipitation, droughts, and floods worldwide. Sri Lanka, a developing country in the Indian Ocean, has suffered frequent floods, affecting over 64 % of the population in the past decade. The Gin River, the primary drinking water source of the densely populated Galle district with over 1 million residents, faces recurrent flood disasters. Therefore, this study employed a multi-model ensemble to simultaneously simulate the impact of climate change on both river flow and inundation extent in the frequently flooded Gin River basin located in humid tropical monsoon region. Bias-corrected climate projections of an ensemble of five General Circulation Models (GCMs) from the Coupled Model Inter-comparison Project Phase 5 (CMIP5) under Representative Concentration Pathway (RCP) 4.5 emission scenario were used to project future river flow and flood inundation in the Gin River basin, Sri Lanka. The validated Rainfall-Runoff-Inundation (RRI) model projected a 5 % increase in high flows (flows exceeding a 5 % probability of exceedance ( Copyright © 2024 Jayapadma Mudalige Miyuru Uthpala Jayapadma et al.

关键词： Floods

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Benoxacor is enantioselectively metabolized by microsomes and cytosol from the human liver

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Emerging Contaminants 2023年第1期9卷 10-19页

作者： Derek Simonsen Jacob Heffelfinger David M.Cwiertny Hans-Joachim Lehmler Department of Occupational and Environmental Health The University of IowaIowa CityIA52242United States Interdisciplinary Graduate Program in Human Toxicology The University of IowaIowa CityIA52242United States IIHR Hydroscience and Engineering The University of IowaIowa CityIA52242United States Department of Civil and Environmental Engineering The University of IowaIowa CityIA52242United States Center for Health Effects of Environmental Contamination The University of IowaIowa CityIA52242United States

Benoxacor is a safener added to current-use herbicide formulations to protect the target crop from herbicidal *** is an emerging environmental contaminant that has been detected in surface waters,raising the possibility of human exposure via drinking *** it is not subject to the same regulations as active pesticide ingredients,its metabolism and toxicity in humans have not been *** we investigate the enantioselective metabolism of benoxacor in human subcellular *** human liver microsomes(pHLM)and cytosol(pHLC)were incubated with racemic benoxacor for up to *** chromatographic analyses were used to measure the enantioselective depletion of *** with and without nicotinamide adenine dinucleotide phosphate(NADPH,co-factor for cytochrome P450 enzymes[CYPs])and pHLC with glutathione(GSH,co-factor for glutathione Stransferases[GSTs])metabolized *** results demonstrate that microsomal CYPs,microsomal carboxylesterase(CESs),and cytosolic GSTs metabolize *** were predicted to have a higher clearance of benoxacor by GSTs than *** and female pHLM incubations with NADPH showed enrichment of the first eluting benoxacor enantiomer(E1-benoxacor).pHLM incubations without NADPH and pHLC incubations with GSH showed an enrichment of the second eluting enantiomer of benoxacor(E2-benoxacor).Our results indicate that human hepatic microsomal and cytosolic enzymes enantioselectively metabolize benoxacor,a fact that needs to be considered when investigating human exposures and toxicities of benoxacor.

关键词： cor metabolism depletion

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Microscopic Investigation on Interfacial Transition Zone in Fly Ash Cement Hydrates Using Roof-Tile Waste Aggregate 2nd

Microscopic Investigation on Interfacial Transition Zone in ...

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2nd International Conference on Sustainable Civil engineering and Architecture, ICSCEA 2021

作者： Okamoto, Kazuma Huynh, Phat Tan Ogawa, Yuko Kawai, Kenji Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kaganiyama Higashihiroshima Japan Depertment of Civil and Environmental Engineering Graduate School of Engineering Hiroshima University 1-4-1 Kaganiyama Higashihiroshima Japan 268 Ly Thuong Kiet Street District 10 Ho Chi Minh Viet Nam Vietnam National University Ho Chi Minh City Linh Trung Ward Thu Duc District Ho Chi Minh Viet Nam

ISBN: (纸本)9789811933028

Previous studies reported that the strength reduction in fly ash concrete (FAC) can be improved by internal curing with roof-tile waste aggregate (RWA). However, how much the internal curing by RWA improved the compressive strength of FAC was different, and there was no clear explanation on it. The purpose of this study is to clarify the effect of the internal curing in the FAC by examining the range of the internal curing effect with RWA in the interfacial transition zone (ITZ) around coarse aggregate. Paste and concrete specimens in which part of cement was replaced with fly ash were prepared. For paste specimens, one aggregate particle was placed in the center of the specimen. Vickers hardness around the aggregate in the paste specimen and the compressive strength of the concrete specimen were investigated. As a result, the range of Vickers hardness improvement around RWA changed depending on the replacement ratio of fly ash. This indicates that the internal curing effect differs depending on the mixture proportion of paste matrix such as the replacement ratio of fly ash. Furthermore, it was observed that the compressive strength of concrete increased as the thickness of ITZ around RWA decreased. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Compressive strength

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Nanoconfinement effect of nanoporous carbon electrodes for ionic liquid-based aluminum metal anode

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Journal of Energy Chemistry 2022年第11期31卷 121-127,I0005页

作者： Juhee Yoon Seongbak Moon Son Ha Hyung-Kyu Lim Hyoung-Joon Jin Young Soo Yun Program in Environmental and Polymer Engineering Inha UniversityIncheon 22212South Korea Department of Polymer Science and Engineering Inha UniversityIncheon 22212South Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841South Korea Division of Chemical Engineering and Bioengineering Kangwon National UniversityGangwon-do 24341South Korea Department of Integrative Energy Engineering Korea UniversitySeoul 02841South Korea

Rechargeable aluminum batteries(RABs),which use earth-abundant and high-volumetric-capacity metal anodes(8040 m Ah cm-3),have great potential as next-generation power sources because they use cheaper resources to deliver higher energies,compared to current lithium ion ***,the mechanism of charge delivery in the newly developed,ionic liquid-based electrolytic system for RABs differs from that in conventional organic ***,targeted research efforts are required to address the large overpotentials and cycling decay encountered in the ionic liquid-based electrolytic *** this study,a nanoporous carbon(NPC)electrode with well-developed nanopores is used to develop a high-performance aluminum *** negatively charged nanopores can provide quenched dynamics of electrolyte molecules in the aluminum deposition process,resulting in an increased collision *** fast chemical equilibrium of anionic species induced by the facilitated anionic collisions leads to more favorable reduction reactions that form aluminum *** nanoconfinement effect causes separated nucleation and growth of aluminum nanoparticles in the multiple confined nanopores,leading to higher coulombic efficiencies and more stable cycling performance compared with macroporous carbon black and 2D stainless steel electrodes.

关键词： Nanoconfinement effect Nanoporous carbon Ionic liquid electrolyte Metal anode Aluminum batteries Multivalent batteries

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Photocatalytic degradation of perfluorooctane sulfonic acid and perfluorooctanoic acid using titanium dioxide/graphene oxide nanocomposite immobilized on polyvinyl alcohol film

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Case Studies in Chemical and environmental engineering 2024年 10卷

作者： Boonchata, Putthicha Boontanon, Narin Jindal, Vinod Aung, Humm Kham Zan Zan Visvanathan, Chettiyappan Fujii, Shigeo Boontanon, Suwanna Kitpati Graduate Program in Environmental and Water Resources Engineering Department of Civil and Environmental Engineering Faculty of Engineering Mahidol University Research Center and Technology Development for Environmental Innovation Faculty of Environment and Resource Studies Mahidol University Department of Chemical Engineering Faculty of Engineering Mahidol University Graduate School of Global Environmental Studies Kyoto University

In full-scale units, the real application of nanoparticles photocatalytic degradation is still challenging due to the requirement of post separation for recovery of fine particles. This work investigated the removal efficiencies of perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) using titanium dioxide (TiO₂) nanoparticles coupling with graphene oxide (GO) sheets immobilized in polyvinyl alcohol (PVA) matrix via solution-casting and a heat-treatment process to achieve the TiO₂/GO/PVA nanocomposite film as a photocatalyst. The operative parameters were focused on initial solution pH value, GO concentration, and heat-treatment time, which subsequently determined the optimal indices for the catalyst film. The structure characterization of the Ti–O–C bond indicated that a strong interaction between GO and TiO₂ had been formed at the hydrolysis process while TiO₂/GO nanoparticles were chemically embedded in PVA matrix by the heat-treatment method. The photocatalytic degradation of PFOS and PFOA produced a nanocomposite film with 25 wt% TiO₂/GO that was treated at 120 °C for 3 h and exhibited a remarkable removal activity in acidic solution with a pH of 3. This condition efficiently degraded PFOS and PFOA by approximately 95.99 % and 96.89 %, respectively, through a photocatalytic reaction. This research presents a straightforward method to synthesize TiO₂/GO/PVA catalyst that influences persistent organic pollutants (POPs) under ultraviolet irradiation, which is of practical significance for environmental applications. © 2024 The Authors

关键词： Graphene oxide PFOA PFOS Photocatalytic Polyvinyl alcohol Titanium dioxide

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Human-nature relationships and its implications on the management of eastern arc water catchments of Tanzania

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Water Science 2023年第1期37卷 11-17页

作者： Lema, M.W. Kapinga, A.G. Madamombe, G.T. Kwawuvi, D. Department of Environmental Engineering and Management University of Dodoma Dodoma Tanzania Department of Environmental Management Pan Africa University Life and Earth Sciences Institute (PAULESI) University of Ibadan Ibadan Nigeria Environmental Management Renewable Energy and Climate Change Research Centre Harare Institute of Technology Harare Zimbabwe Graduate Research Program on Climate Change and Water Resources University of Abomey-Calavi du Benin Abomey Benin

This study is aimed at understanding the Human–Nature Relationships (HNRs) in the Lower Mngeta and Upper Zigi catchments, as parts of Eastern Arc water catchment areas, in the United Republic of Tanzania. This study employed the Theory of Planned Behavior (TPB) and Norm-Activation Model (NAM) to understand the position of humans in the two catchments’ ecosystems. The study design involved Focus Group Discussions, Key Informant Interview, and Household Questionnaire Surveys. A total of 310 (185 males and 125 females) villagers were involved in this study. Furthermore, four HRN typologies, master over nature, partner with nature, a participant in nature, and steward of nature, were adopted. The study findings indicated that there was no significant difference (X ² test, p > 0.05) in HNRs between the two catchments. Moreover, master over nature typology was dominant in both catchments, with values of 59.4% (n = 200) and 59.5% (n = 85) in Lower Mngeta and Upper Zigi, respectively. The main reason is that HNR is dependent on the nature of the livelihood activities and the mode of subsistence of a particular community. It was also found that the communities in Lower Mngeta and Upper Zigi catchments are mostly dependent on agricultural and hunting activities that highly depended on the two catchment resources. This study, therefore, recommends an increase in the level of community participation in all decision-making activities, as well as an increase in environmental education for sustainable utilization and management of the two catchment resources. © 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

关键词： Catchment master Mngeta participant Zigi

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Influence of rice husk ash and hybrid fiber on engineering properties of densified high-performance fiber-reinforced concrete

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Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 2023年第11期237卷 2845-2857页

作者： Vo, Duy-Hai Nguyen, Minh-Hieu Nguyen, May Huu Hwang, Chao-Lung Huynh, Trong-Phuoc The University of Danang University of Technology and Education Danang Viet Nam Vinh Long Department of Construction Vinh Long Viet Nam Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima Japan Department of Bridge and Tunnel Faculty of Civil Engineering University of Transport Technology Hanoi Viet Nam Taiwan Building Technology Center National Taiwan University of Science and Technology Taipei Taiwan Faculty of Civil Engineering College of Engineering Can Tho University Can Tho Viet Nam

Conventional concrete significantly affects the environment due to high CO2 emission into the atmosphere during the production process. In order to improve concrete performance and arrest the incidence of global warming, the use of additive materials for cement replacement has been promoted worldwide. This study was designed to investigate the mechanical properties of high-performance fiber-reinforced concrete (HFRC) produced using rice husk ash (RHA) and hybrid fiber (HF) in accordance with the densified mixture design algorithm (DMDA) mix design method. Samples were produced using RHA as a direct replacement for cement at 10%, 20%, and 30%. HF, comprising steel and polypropylene fibers, was added (by volume) to the 20% RHA group mixture to improve the HFRC sample properties. Based on the experimental results, higher RHA contents had a generally negative effect on the fresh properties of the HFRC mixtures. Compressive strength values ranged from 53 to 72 MPa with various RHA and HF content. RHA replacement levels up to 20% had an insignificant effect on the strength development and dynamic modulus of the HFRC samples. However, the addition of HF improved splitting tensile strength, flexural strength, and dynamic modulus remarkably at all curing ages. Furthermore, the 91-day drying shrinkage was in the ranges of 0.032%–0.039% and 0.023%–0.034% using different RHA and HF levels, respectively. Increasing both RHA and HF contents significantly reduced drying shrinkage in the samples. Multivariable regression was also performed, clarifying that all tested results were consistent and had good correlations. The results of this study also provide a potentially effective use for abundantly available industrial waste products such as fly ash (FA) and RHA to promote the production of greener and more sustainable concrete. © IMechE 2023.

关键词： Bending strength

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Kinetic Behaviors and Nitrite Accumulation of Thiosulfate Autotrophic Denitrification Process

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SSRN 2024年

作者： Chang, Jenting Septiariva, Iva Yenis Yang, Youren Chuang, Shun-Hsing Graduate Institute of Environmental Engineering National Central University Taoyuan City32001 Taiwan Civil Engineering Study Program Sebelas Maret University Surakarta57126 Indonesia

Exploration of the effects of different S/N ratios on the accumulation of NO2-N in the autotrophic denitrification process is crucial due to no need for an external organic carbon supply. Herein, thiosulfate-driven autotrophic denitrification (SADN) was established in a sequencing batch reactor treating nitrate-containing wastewater. The long-term and batch tests observed that when sufficient thiosulfate was present, the branched thiosulfate oxidation (BTO) reaction occured. Therefore, the sulfur-to-nitrogen (S/N) molar ratio had to be maintained over 2.19 to provide enough electron donors for complete denitrification with SNaRR of 13.13 mg NO3-N/g ***. If the S/N molar ratio declined to 1.75, some nitrite accumulation would utilize the stored elemental sulfur. SNiRR increased from 0.4 – 20.1 mg NO2-N/g *** when the S/N ratio rose from 1.46 to 4.38. Under a sufficient S/N ratio, the change in nitrogen concentration followed a zero order reaction. The microbial analysis identified Desulfobacterota as key microbes, with autotrophic denitrifying bacteria accounting for more than 70%. © 2024, The Authors. All rights reserved.

关键词： Denitrification

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The dependence in microcystin removal with powdered activated carbon on variant properties, carbon properties, and dissolved organic matter

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Chemosphere 2024年 351卷 141205页

作者： Huang, Yuzhou Lenhart, John J. Environmental Science Graduate Program The Ohio State University United States Department of Civil Environmental and Geodetic Engineering The Ohio State University United States

Powdered activated carbon (PAC) is commonly used by water treatment plants to remove harmful cyanotoxins such as microcystins (MCs) produced during seasonal harmful algal blooms. MC removal by PAC depends upon the properties of the PAC, the properties of the MC variant, and the presence and properties of dissolved organic matter (DOM). To identify which of these factors has the greatest impact on the removal of MC by PAC, we evaluated the removal of four different MC variants (MC-LR, MC-LA, MC-RR and desmethylated MC-RR) by three different PAC types (wood-based, coal-blend and coal-based). The role of DOM properties was evaluated using DOM isolated from two different sources, a terrestrial source (Suwannee River Fulvic Acid, SRFA) and a microbial source (Grand Lake St Marys DOM, GLSM). The results of adsorption experiments conducted over a period of 72 h demonstrated the wood-based PAC, which had the highest surface area and mesopore volume of the PAC tested, had the highest adsorption rate and capacity for all four MC variants. Of the variants studied, neutrally charged MC-RR was adsorbed more rapidly and to a greater extent on all of the PAC types than were the other variants. Although MC-LA and MC-LR had the greatest hydrophobicity, their negative charges resulted in their being adsorbed the least. As expected, DOM inhibited microcystin adsorption to PAC. The degree of inhibition, however, did not significantly vary for the two DOM types evaluated, indicating the properties of the DOM on MC adsorption to PAC was less important than the PAC properties or MC variant properties. Overall, PAC properties were a more important factor in MC removal than were the MC properties or DOM conditions. © 2024 Elsevier Ltd

关键词： Adsorption DOM Kinetic Mesopores Microcystin PAC

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