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11th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2022

作者： Yamazaki, R. Ono, K. Takeshima, N. Okada, S. Kitane, Y. Matsumura, M. Department of Civil and Environmental Engineering Waseda University Tokyo Japan IHI Infrastructure Systems Co. Ltd Tokyo Japan Department of Civil and Earth Resources Engineering Graduate School of Engineering Kyoto University Kyoto Japan Center for Water Cycle Marine Environment and Disaster Management Kumamoto University Kumamoto Japan

ISBN: (纸本)9781032345314

In 2017, SBHS (Steels for Bridge High-performance Structure) has been specified in "Specifications for Highway Bridges" in Japan. In order to investigate local buckling strength of welded box stub-column made of SBHS500 under axial compression, finite element analyses were conducted, covering a wide range of width-to-thickness ratio (RR). The validity of the analysis models was examined by comparing the experiment results in previous study and reproduction analysis results. Then, the local buckling strength obtained from analysis results were compared with existing ultimate strength curves. As a result, the ultimate strength values obtained from parametric analysis were slightly lower than values given by existing ultimate strength curves around RR = 0.7. In the end of this study, another ultimate strength curve which can evaluate local buckling strength of welded box stub column made of SBHS500 more accurately was proposed based on the analysis results. © 2022 the Author(s).

关键词： Axial compression

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Tracing crop water demand in the lower ping River Basin, Thailand using cloud-based irrisat application 22

Tracing crop water demand in the lower ping River Basin, Tha...

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22nd Congress of the International Association for Hydro-Environment engineering and Research-Asia Pacific Division: Creating Resilience to water-Related Challenges, IAHR-APD 2020

作者： Kyaw, Khin Muyar Rittima, Areeya Phankamolsil, Yutthana Tabucanon, Allan Sriratana Sawangphol, Wudhichart Kraisangka, Jidapa Talaluxmana, Yutthana Vudhivanich, Varawoot Department of Civil and Environmental Engineering Faculty of Engineering Mahidol University Nakhon Pathom Thailand Environmental Engineering and Disaster Management Program Diversion of Engineering Mahidol University Kanchanaburi Thailand Faculty of Environment and Resource Studies Mahidol University Thailand Faculty of Information and Communication Technology Mahidol University Department of Water Resources Engineering Faculty of Engineering Kasetsart University Bangkok Thailand Department of Irrigation Engineering Faculty of Engineering at Kamphaengsaen Kasetsart University Nakhon Pathom Thailand

Estimating and tracing actual crop water demands during the growing season are necessarily essential as it can be the basic and useful information for achievement of irrigation water management and reservoir operation practices. The crop water demand (ETcrop) is commonly determined by multiplying the crop coefficient (Kc) and reference crop evapotranspiration (ETo) calculating from meteorological data at the nearby stations. In this study, the planting area and growth stage of crops in the Tortongdang, Wangbua, Wangyang and Nongkhwan Operation and Maintenance Projects, which are located in the Lower Ping River Basin, were tracked and crop coefficient was evaluated using weather based irrigation scheduling (IrriSAT) application for estimation of crop water requirement. IrriSAT provides the satellite images processing of Normalized Difference Vegetation Index (NDVI) of planting area of crop and uses empirical relationship to find Kc. Kc values of season and off-season crops planting in four irrigation area during 2000-2019 were traced by IrriSAT and the results were compared with average Kc-RID values which were calculated as a function of Kc from field observation for the different types of crop and accumulated area of crops monitored by the remote sensing. The results showed the similar patterns of average Kc over the growth stages of crops. However, the Kc values calculated by IrriSAT for four irrigation area were slightly deviated from Kc-RID values in some growing periods. Therefore, calibrating Kc values calculated by IrriSAT was then conducted in this study to estimate actual crop water use and benchmark with the filed observation data. This study also revealed that applying cloud-based IrriSAT could be greatly supportive for irrigators and reservoir operators to enhance the efficiency of irrigation water management. © 2020 22nd Congress of the International Association for Hydro-Environment engineering and Research-Asia Pacific Division, IAHR-APD 2020: "Creati

关键词： Evapotranspiration

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Comprehensive assessment of water and sediment quality to support sustainable management practices and mitigate potential risks of trace metal pollution in the Johor River Basin, South Peninsular Malaysia

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Ecohydrology and Hydrobiology 2024年第2期25卷 315-329页

作者： Mazilamani, Lelavathy S. Annammala, Kogila V. Martin, Patrick Qi, Liang Y. Sugumaran, Dhinesh Ling, Yong E. Reynard, P.S. Nurhidayat, Agus Syawal, Muhamad S. Sutapa, Ignasius D.A. Department of Water & Environmental Engineering Faculty of Civil Engineering Universiti Teknologi Malaysia Johor Bahru Malaysia Disaster Preparedness and Prevention Centre Universiti Teknologi Malaysia Kuala Lumpur Malaysia Asian School of the Environment Nanyang Technological University Singapore Centre of Environmental Sustainability & Water Security (IPASA) Research Institute for Sustainable Environment (RISE) Universiti Teknologi Malaysia Johor Bahru Malaysia Faculty of Engineering – Industrial Engineering International Study Program University of Indonesia Indonesia Asia Pacific Centre for Ecohydrology (APCE) – UNESCO C2C Indonesia Research Centre for Limnology and Water Resources – NRIA Indonesia Faculty of Environmental Science and Technology – Soegijapranata Catholic University (SCU) Semarang Indonesia

Human activities have caused concerns over the contamination of trace elements in aquatic systems due to their toxicity, long-lasting nature, and ability to accumulate in living organisms. This study evaluated the spatial pattern, environmental hazard, and potential health hazard of 13 trace metals in water and sediment samples collected from the Johor River basin using multivariate statistical techniques in order to identify the impact of both natural and human-related factors on the presence of trace metals in the area. The increased levels of metals in Station S1 indicated a significant impact from municipal, domestic, and industrial waste. The Geo-accumulation Index (I_geo) values for pollution and ecological indices in the sediment of the Johor River Basin ranged from -9.44 to 6.27. The Pollution Load Index (PLI) values ranged from 0.05 to 0.18, and the Potential Ecological Risk Assessment (RI) values ranged from 2.15 to 11.18. These results indicate that the sediments in the Johor River Basin have a low risk of contamination from trace metals. The water's hazard quotient (HQ) had an average value of 0.0001, while the hazard index (HI) had an average value of 0.0003. It is important to increase stakeholders' understanding and concerns regarding the potential long-term human health and ecological implications associated with trace metals in Johor River water. The results of this study offer essential initial information for government entities to implement sustainable management strategies, reducing the likelihood of future trace metal contamination issues in the Johor River basin and similar regions. © 2024 European Regional Centre for Ecohydrology of the Polish Academy of Sciences

关键词： Health assessment Johor river basin Multivariate analysis Sediment quality Trace metals water quality

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Computational simulation and comparison of the effect of different surroundings on wind loads on domed structures

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Tamkang Journal of Science and engineering 2006年第3期9卷 291-297页

作者： Lin, Jin-Shian Chang, Cheng-Hsin Shang, Neng-Chou Department of Water Resources and Environmental Engineering Tamking University Tamsui 251 Taiwan Department of Civil Engineering Tamking University Tamsui 251 Taiwan Graduate Institute of Environmental Engineering National Taiwan University Taipei 106 Taiwan

Mean surface pressures and overall wind loads on domes immersed in a boundary layer were obtained by computational fluid dynamics simulation. The effects of alternative turbulence models, upwind area roughness were examined and compared with wind tunnel studies. Surface pressures on dome structures were calculated in two cases by numerical simulation. One is with surrounding structures to calculate the wind comes from east and west direction, another one is no surrounding structure existing. The results will be evaluated the accuracy of numerical simulation with different roughness types of upwind area and effect of surroundings. Calculated values were compared to wind-tunnel measurements made in equivalent flow conditions.

关键词： Wind effects

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Comparison of Taylor Galerkin and FTCS models for dam-break simulation 5

Comparison of Taylor Galerkin and FTCS models for dam-break ...

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5th International Seminar on Sustainable Urban Development, ISoSUD 2020

作者： Hafiyyan, Q. Adityawan, M.B. Harlan, D. Natakusumah, D.K. Magdalena, I. Graduate School of Civil Engineering Bandung Institute of Technology Jawa Barat Bandung Indonesia Center for Coastal and Marine Development Bandung Institute of Technology Jawa Barat Bandung Indonesia Study Program of Water Resouces Engineering and Management Bandung Institute of Technology Jawa Barat Bandung Indonesia Study Program of Water Resources Engineering Bandung Institute of Technology Jawa Barat Bandung Indonesia Industrial and Financial Mathematics Research Group Bandung Institute of Technology Jawa Barat Bandung Indonesia

The aim of this paper is to compare the ability of two numerical models to simulate two-dimensional dam-break flows. Dam-break modelling is important in reducing the high-risk of dam failure by determining the water flow movement and its effect on buildings downstream. In this study, the Taylor Galerkin and Forward Time Central Space method is presented to simulate 2-D dam-break flow. The Hansen filter is applied to both methods to reduce numerical instability oscillations in the model. The filters were used for each time step at each computing point. The model is verified by comparing the result simulation with numerical results from previous studies. The result show that Taylor Galerkin numerical scheme with Hansen filter is successful to simulate the problem of 2-D dam-break. Also, the Taylor Galerkin model has better results than the FTCS model. Studies like this are needed for mitigation efforts in the event of dam failure. © Published under licence by IOP Publishing Ltd.

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Classification of groundwater chemistry in Shimabara, using self-organizing maps

Classification of groundwater chemistry in Shimabara, using ...

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作者： Nakagawa, Kei Amano, Hiroki Kawamura, Akira Berndtsson, Ronny Graduate School of Fisheries and Environmental Sciences Nagasaki University 1-14 Bunkyo-machi Nagasaki852-8521 Japan Graduate School of Urban Environmental Sciences Tokyo Metropolitan University 1-1 Minami-Oshawa Hachioji Tokyo192-0397 Japan Division of Water Resources Engineering Center for Middle Eastern Studies Lund University Box 118 LundSE-221 00 Sweden

Shimabara City in Nagasaki Prefecture, Japan, is located on a volcanic peninsula that has abundant groundwater. Almost all public water supplies use groundwater in this region. For this reason, understanding groundwater characteristics is a pre-requisite for proper water supply management. Thus, we investigated the groundwater chemistry characteristics in Shimabara by use of selforganizing maps (SOMs). The input to SOM was concentrations of eight major groundwater chemical components, namely Cl-, NO3-, SO42-, HCO3-, Na+, K+, Mg2+, and Ca2+ collected at 36 sampling locations. The locations constituted private and public water supply wells, springs, and a river sampled from April 2012 to May 2015. Results showed that depending on the chemistry, surface water and groundwater could be classified into five main clusters displaying unique patterns. Further, the five clusters could be divided into two major water types, namely, nitrate-and nonpolluted water. According to Stiff and Piper trilinear diagrams, the nitrate-polluted water represented Ca-(SO4+ NO3) (calcium sulfate nitrate) type, while the non-polluted water was classified as Ca-HCO3 (calcium bicarbonate) type. This indicates that recharging rain water in the upstream areas is polluted by agricultural activities in the mid-slope areas of Shimabara. © 2017 IWA Publishing.

关键词： Cluster analysis

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Land Response to Atmosphere at Different Resolutions in the Common Land Model over East Asia

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Advances in Atmospheric Sciences 2016年第3期33卷 391-408页

作者： Daeun KIM Yoon-Jin LIM Minseok KANG Minha CHO Department of Civil and Environmental Engineering Hanyang University222 Wangsimni-roSeongdong-guSeoul 04763Republic of Korea Applied Meteorological Research Division National Institute of Meteorological ResearchKorean Meteorological Administration61 Yeouidaebang-ro16-gilDongjak-guSeoul 63568Republic of Korea National Center for AgroMeteorology Bid.#36(RM.#109)Seoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea Department of Water Resources Graduate School of Water ResourcesSungkyunkwan University2066 Seobu-roJangan-guSuwonGyeonggi-do 16419Republic of Korea

Towards a better understanding of hydrological interactions between the land surface and atmosphere, land surface mod- els are routinely used to simulate hydro-meteorological fluxes. However, there is a lack of observations available for model forcing, to estimate the hydro-meteorological fluxes in East Asia. In this study, Common Land Model （CLM） was used in offline-mode during the summer monsoon period of 2006 in East Asia, with different forcings from Asiaflux, Korea Land Data Assimilation System （KLDAS）, and Global Land Data Assimilation System （GLDAS）, at point and regional scales, separately. The CLM results were compared with observations from Asiaflux sites. The estimated net radiation showed good agreement, with r = 0.99 for the point scale and 0.85 for the regional scale. The estimated sensible and latent heat fluxes using Asiaflux and KLDAS data indicated reasonable agreement, with r = 0.70. The estimated soil moisture and soil temperature showed similar patterns to observations, although the estimated water fluxes using KLDAS showed larger discrepancies than those of Asiaflux because of scale mismatch. The spatial distribution of hydro-meteorological fluxes according to KLDAS for East Asia were compared to the CLM results with GLDAS, and the GLDAS provided online. The spatial distributions of CLM with KLDAS were analogous to CLM with GLDAS, and the standalone GLDAS data. The results indicate that KLDAS is a good potential source of high spatial resolution forcing data. Therefore, the KLDAS is a promising alternative product, capable of compensating for the lack of observations and low resolution grid data for East Asia.

关键词： Common Land Model Korea Land Data Assimilation System Global Land Data Assimilation System Asi-aflux hydro-meteorological fluxes

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Flood hydrograph simulation to estimate peak discharge in Ciliwung river basin 2

Flood hydrograph simulation to estimate peak discharge in Ci...

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2nd International Conference on Disaster and Management 2020, ICDM 2020

作者： Pratama, M.I. Rohmat, F.I.W. Farid, M. Adityawan, M.B. Kuntoro, A.A. Moe, I.R. Graduate School of Civil Engineering Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung Indonesia Water Resources Engineering Research Group Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung Indonesia Center for Coastal and Marine Development Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung Indonesia Center for Water Resources Development Institute for Research and Community Services Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung Indonesia Directorate General of Water Resources Ministry of Public Works and Housing 12110 20th Pattimura Street Kebayoran Baru Jakarta Selatan Indonesia

Ciliwung River Basin is one of 13 watersheds located in the Special Capital Region of Jakarta (DKI Jakarta), one of the most vulnerable cities facing flood disaster. Modeling hydrographs in a flood computer model is a crucial process in understanding the hydraulic processes in floods;however, more often than have adequately not studied watersheds do not available observed data. Well-calibrated hydrographs serve as the basis for a basin-wide flood model. In this study, the Snyder, ITB, and SCS Unit Hydrograph are constructed in the study case of flooding in the Ciliwung River Basin, with West Java rainfall distribution method and Alternating Block Method as the adopted rainfall distributions, providing six combinations of approaches. Calibration and validation analysis show a combination of West Java rainfall distribution and SCS UH with a lag time of 5.5 gives the smallest deviation, with an accuracy of 83.3%, therefore it is recommended for use to estimate design future flood hydrograph. © Published under licence by IOP Publishing Ltd.

关键词： watersheds

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FIELD TRAPPING OF SUBSURFACE VAPOR-PHASE PETROLEUM-HYDROCARBONS

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GROUND water MONITORING AND REMEDIATION 1994年第1期14卷 110-119页

作者： MOYER, EE OSTENDORF, DW KAMPBELL, DH XIE, YF Ellen E. Moyer (ENSR Consulting and Engineering 35 Nagog Park Acton MA 01720) is a senior environmental engineer at ENSR Consulting and Engineering in Acton Massachusetts. Her research interests include bioremediation air sparging soil venting and analytical modeling of subsurface contamination. Moyer is a registered Professional Engineer with an M.S. in environmental engineering and a Ph.D. in civil engineering from the University of Massachusetts at Amherst and a member of the National Ground Water Association and the American Society of Civil Engineers. David W. Ostendorf (Civil Engineering Department University of Massachusetts Amherst MA 01003) is an associate professor in the environmental engineering program of the Civil Engineering Department of the University of Massachusetts at Amherst. His research interests include unconfined aquifer contamination hazardous waste site remediation and analytical modeling of problems in environmental fluid mechanics. Ostendorf is a registered Professional Engineer and a member of the American Geophysical Union American Society of Civil Engineers Soil Science Society of America Water Pollution Control Federation and Association of Environmental Engineering Professors as well as the National Ground Water Association. Don H. Kampbell (Robert S. Kerr Environmental Research Laboratory Ada OK 74820) is a research chemist at the U.S. EPA Robert S. Kerr Environmental Research Laboratory in Ada Oklahoma. His research interests include gas chromatog- raphy GC/mass spectrometry industrial waste processes soil bioreactor systems aquifer biorestoration and soil gas measurements. Kampbell is a certified Professional Soil Scientist and a registered Professional Engineer as well as a member of the Soil Science Society of America and the American Chemical Society. Yuefeng Xie (Civil Engineering Department University of Massachusetts Amherst MA 01003) is a postdoctoral research associate in the environmental engineering program of the Civil Engineering Depart

Soil gas samples from intact soil cores were collected on adsorbents at a field site, then thermally desorbed and analyzed by laboratory gas chromatography (GC). Vertical concentration profiles of predominant vapor phase petroleum hydrocarbons under ambient conditions were obtained for the zone directly above the capillary fringe. water and residual phase weathered aviation gasoline were present in this region of the profile. The sampling, trapping, and GC methodology was effective in most respects. Reproducibility, trapping, and desorption efficiency were generally satisfactory, and different sorbent tubes gave similar results. A minor shortcoming of the method occurred with the most volatile compound, 2,3-dimethylbutane, which was poorly retained during several weeks of storage time and was also poorly desorbed. Vapor phase concentrations of predominant hydrocarbon compounds all increased with depth at one sampling location. At a more highly contaminated location, concentrations of highly volatile compounds increased with depth while concentrations of less volatile compounds remained constant or decreased, possibly indicating distillation effects. Scatter in the data was attributed to heterogeneities in water and residual phase distribution.

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Release of chemicals from contaminated soils

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Soil and Sediment Contamination 1998年第5期7卷 543-558页

作者： Williamson, Derek G. Loehr, Raymond C. Kimura, Yosuke Environmental and Water Resources Engineering Program University of Texas at Austin Austin TX 78712 United States

At sites that contain contaminated soils, there can be questions about the magnitude of risk posed by the chemicals in the soils and about the cleanup levels that should be achieved. Knowledge about the rate of release of chemicals is important to answers to such questions. This article: (1) describes a laboratory protocol to obtain rate of release information for chemicals in soils, and (2) provides estimates of the rate of release of individual polyaromatic hydrocarbon (PAH) compounds from several manufactured gas plant (MGP) site soils. The data were analyzed using an empirical two-site model. Different fractions of PAH were released rapidly from these soils. For one soil, this fraction was less than 20%, for others, the fraction ranged from 36 to 85%. The first-order rate constant (k2) of PAH released during the slow phase of chemical release ranged from 0.0001 to 0.01 per hour. © 1998 by AEHS.

关键词： Availability Chemical release MGP sites PAH Remediation Soils

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