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Evaluation of alternative surface runoff accounting procedures using SWAT model

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International Journal of Agricultural and Biological Engineering 2015年第3期8卷 54-68页

作者： Haw Yen Michael J.White Jaehak Jeong Mazdak Arabi jeffrey g.arnold Department of Civil and Environmental Engineering Colorado State UniversityFort Coll insColorado 80523USA Blackland Research&Extension Center Texas A&M Agrilife ResearchTempleTexas 76502USA grassland Soil&Water Research LaboratoryUSDA-ARSTempleTexas 76502USA

For surface runoff estimation in the Soil and Water Assessment Tool(SWAT)model,the curve number(CN)procedure is commonly adopted to calculate surface runoff by dynamically updating CN values based on antecedent soil moisture condition(SCSI)in *** SWAT2005 and onward,an alternative approach has become available to apply the CN method by relating the runoff potential to daily evapotranspiration(SCSII).While improved runoff prediction with SCSII has been reported in several case studies,few investigations have been made on its influence to water quality output or on the model uncertainty associated with the SCSII *** objectives of the research were:(1)to quantify the improvements in hydrologic and water quality predictions obtained through different surface runoff estimation techniques;and(2)to examine how model uncertainty is affected by combining different surface runoff estimation techniques within SWAT using Bayesian model averaging(BMA).Applications of BMA provide an alternative approach to investigate the nature of structural uncertainty associated with both CN *** showed that SCSII and BMA associated approaches exhibit improved performance in both discharge and total NO3 predictions compared to *** addition,the application of BMA has a positive effect on finding well performed solutions in the multi-dimensional parameter space,but the predictive uncertainty is not evidently reduced or ***,we recommend additional future SWAT calibration/validation research with an emphasis on the impact of SCSII on the prediction of other pollutants.

关键词： Soil and Water Assessment Tool(SWAT),curve number method,Bayesian model averaging,uncertainty analysis hydrology,water quality

Impacts of climate change on hydrology,water quality and crop productivity in the Ohio-Tennessee River Basin

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International Journal of Agricultural and Biological Engineering 2015年第3期8卷 36-53页

作者： Yiannis Panagopoulos Philip W.gassman Raymond W.Arritt Daryl E.Herzmann Todd D.Campbell Adriana Valcu Manoj K.Jha Catherine L.Kling Raghavan Srinivasan Michael White jeffrey g.arnold Center for Agricultural and Rural Development(CARD) Iowa State UniversityAmesIA 50011-1070USA Department of Agronomy 2104 Agronomy HallIowa State UniversityAmes IA 50011-1010USA Department of Civil Architectural and Environmental Engineering456 McNair HallNorth Carolina A&T State UniversityGreensboroNC 27411USA Departments of Ecosystem Sciences and Management and Biological and Agricultural Engineering 1500 Research ParkwaySuite B223220 TAMUTexas A&M UniversityCollege StationTX 77843-2120USA grassland Soil and Water Research Laboratory U.S.Department of Agriculture-Agricultural Research Service808 East Blackland RoadTempleTX 76502USA

Nonpoint source pollution from agriculture is the main source of nitrogen and phosphorus in the stream systems of the Corn Belt region in the Midwestern *** eastern part of this region is comprised of the Ohio-Tennessee River Basin(OTRB),which is considered a key contributing area for water pollution and the Northern gulf of Mexico hypoxic zone.A point of crucial importance in this basin is therefore how intensive corn-based cropping systems for food and fuel production can be sustainable and coexist with a healthy water environment,not only under existing climate but also under climate change conditions in the *** address this issue,a OTRB integrated modeling system has been built with a greatly refined 12-digit subbasin structure based on the Soil and Water Assessment Tool(SWAT)water quality model,which is capable of estimating landscape and in-stream water and pollutant yields in response to a wide array of alternative cropping and/or management strategies and climatic *** effects of three agricultural management scenarios on crop production and pollutant loads exported from the crop land of the OTRB to streams and rivers were evaluated:(1)expansion of continuous corn across the entire basin,(2)adoption of no-till on all corn and soybean fields in the region,(3)implementation of a winter cover crop within the baseline *** effects of each management scenario were evaluated both for current climate and projected mid-century(2046-2065)climates from seven global circulation models(gCMs).In both present and future climates each management scenario resulted in reduced erosion and nutrient loadings to surface water bodies compared to the baseline agricultural management,with cover crops causing the highest water pollution *** and soybean yields in the region were negligibly influenced from the agricultural management *** the other hand,both water quality and crop yield numbers under climate change deviated considerably f

关键词： agricultural management scenarios corn-based systems global circulation models hydrology water quality crop yields SWAT Ohio-Tennessee River Basin

Simulation of rice paddy systems in SWAT:A review of previous applications and proposed SWAT+rice paddy module

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International Journal of Agricultural and Biological Engineering 2022年第1期15卷 1-24页

作者： Philip W.gassman Jaehak Jeong Julien Boulange Balaji Narasimhan Tasuku Kato Hiroaki Somura Hirozumi Watanabe Sadao Eguchi Yuanlai Cui Atsushi Sakaguchi Le Hoang Tu Rui Jiang Min-Kyeong Kim jeffrey g.arnold Wei Ouyang Center for Agricultural and Rural Development Iowa State UniversityAmesIowa 50011-1070USA Blackland Research&Extension Center Texas A&M AgriLifeTempleTexas 76502USA Department of International Environmental and Agricultural Sciences Tokyo University of Agriculture and TechnologyFuchuTokyo 183-8509Japan Department of Civil Engineering Indian Institute of Technology MadrasChennai 600036India graduate School of Environmental and Life Science Faculty of EngineeringOkayama UniversityOkayama 700-8530Japan Institute for Agro-Environmental Sciences National Agriculture and Food Research OrganizationTsukuba 305-8604Japan State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China Department of Biological&Environmental Sciences Faculty of AgricultureYamaguchi UniversityYamaguchi 753-8515Japan Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of AgricultureCollege of Natural Resources and EnvironmentNorthwest A&F UniversityYangling 712100ShaanxiChina Rural Development Administration Jeonju54875Republic of Korea grassland Soil and Water Research Laboratory U.S.Department of Agriculture-Agricultural Research ServiceTempleTexas 76502USA School of Environment State Key Laboratory of Water Environment SimulationBeijing Normal UniversityBeijing 100875China

The Soil and Water Assessment Tool(SWAT)is an ecohydrological watershed-scale model which was initially developed in the early 1990s to simulate the impacts of land use,management systems,and climate on hydrology and/or water *** adopted in the U.S.,the use of the model then spread to Europe and then later to Asia and other *** range of applications that SWAT has been applied to have also expanded dramatically,which influenced ongoing model development which has been virtually continuous over the past two decades.A key component of many SWAT applications in Asia is accounting for rice paddy production that is common in some subregions within the ***,most of these studies do not provide explicit details of how rice production was simulated in *** research has revealed that significant problems occur when trying to represent rice paddy systems in standard versions of SWAT,due to limitations in algorithms based on the runoff curve number approach or the pothole *** response,key modifications have been made to SWAT in recent studies that have resulted in more accurate representation of rice paddy *** developments point to the need for the incorporation of an enhanced rice paddy module within SWAT to better capture rice paddy hydrological and pollutant dynamics,which would support improved use of the model in Asia and other rice production *** related to simulating rice production in SWAT are discussed as follows:1)an overview of global rice production;2)history of SWAT development;3)typical approaches for simulating rice production;4)problems associated with the typical approaches;5)recent code modifications to address deficiencies in replicating rice paddy systems;6)recommendations for developing a standard rice paddy module for future SWAT codes.

关键词： SWAT rice paddies potholes hydrology pollutants modified SWAT models

Hepatocellular carcinoma recurrence after liver transplant:An Australian single-centre study

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World Journal of Transplantation 2025年第1期15卷 105-114页

作者： Matthew g garas Luis Calzadilla-Bertot Briohny W Smith Luc Delriviere Byron Jaques Lingjun Mou Leon A Adams gerry C MacQuillan george garas gary P jeffrey Michael C Wallace Medical School University of Western AustraliaNedlands 6009Western AustraliaAustralia Department of Hepatology Sir Charles Gairdner HospitalNedlands 6009Western AustraliaAustralia Department of Surgery Sir Charles Gairdner HospitalNedlands 6009Western AustraliaAustralia

BACKgROUND Hepatocellular carcinoma(HCC)is a leading cause of cancer-related deaths *** transplantation(LT)offers the most effective *** recurrence is the strongest risk factor that decreases post-LT survival in patients transplanted for *** rate of HCC recurrence is generally reported as 8%-20%in the *** predictors of HCC have already been researched,however,to our knowledge there are no published studies on this topic using Australian *** To determine the rate and identify predictors of HCC recurrence in a contemporary Western Australian LT *** We performed a retrospective cohort study of all liver transplants in patients with HCC at Sir Charles gairdner Hospital between 2006 and *** was collected from various health record databases and included recipient demographics,serum biochemistry,radiology,operation notes,explant histopathology and details of *** survival of HCC patients post-LT,stratified for recurrence,was calculated by Kaplan Meier *** and multivariate Cox regression was used to determine predictors of HCC recurrence *** Between 1/1/2006 and 12/31/2021,119 patients were transplanted with HCC.8.4%of subjects developed recurrent HCC after LT with median follow-up time of 5.4 *** median time to recurrence was 2.9 years±0.75 *** comparing baseline characteristics,a greater proportion of subjects with recurrence had common characteristics on explant histopathology,including>3 viable nodules(P=0.001),vascular invasion(P=0.003)and poorly differentiated HCC(P=0.03).Unadjusted survival curves showed lower 1-year,3-year,5-year and 10-year survival rates in subjects with HCC recurrence compared to those without HCC recurrence(90%vs 92%,70%vs 88%,42%vs 80%,14%vs 76%,respectively;log rank Pgnificantly impacted post-LT *** studies are requir

关键词： Liver cancer Recurrence Liver transplantation Hepatocellular carcinoma Predictors Post-transplant survival Australian data

COHESIVE ZONE FINITE ELEMENT-BASED MODELINg OF HYDRAULIC FRACTURES

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Acta Mechanica Solida Sinica 2009年第5期22卷 443-452页

作者： A.P.Bunger Robert g.jeffrey CSIRO Petroleum Resources Bayview AvenueClaytonVIC 3168Australia

Hydraulic fracturing is a powerful technology used to stimulate fluid production from reservoirs. The fully 3-D numerical simulation of the hydraulic fracturing process is of great importance to the efficient application of this technology, but is also a great challenge because of the strong nonlinear coupling between the viscous flow of fluid and fracture propagation. By taking advantage of a cohesive zone method to simulate the fracture process, a finite element model based on the existing pore pressure cohesive finite elements has been established to investigate the propagation of a penny-shaped hydraulic fracture in an infinite elastic medium. The effect of cohesive material parameters and fluid viscosity on the hydraulic fracture behaviour has been investigated. Excellent agreement between the finite element results and analytical solutions for the limiting case where the fracture process is dominated by rock fracture toughness demonstrates the ability of the cohesive zone finite element model in simulating the hydraulic fracture growth for this case.

关键词： hydraulic fracture cohesive zone model finite element method

Coupled Inversion of Pressure and Tiltmeter Data for Mapping Hydraulic Fracture geometry

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Acta Mechanica Solida Sinica 2024年第3期37卷 396-405页

作者： Zuorong Chen Xiaofang Jiang Zhejun Pan Robert g.jeffrey National Key Laboratory of Continental Shale Oil Northeast Petroleum UniversityDaqing163318China SCT Operation Pty.Ltd. PO Box 824WollongongNSW2520Australia

Pressure and tilt data are jointly inverted to simultaneously map the orientation and dimensions of a hydraulic *** deformation induced by a fracture under internal pressure is modeled using the distributed dislocation *** planar fracture is represented by four quarter ellipses,joined at the center and sharing *** configuration provides a straightforward model for characterizing asymmetric fracture *** inverse problem of mapping the fracture geometry is formulated using the Bayesian probabilistic method,combining the a priori information on the fracture model with updated information from pressure and tilt *** the nonlinear inverse problem is achieved by pseudo-randomly sampling the posterior probability distribution through the Markov chain Monte Carlo *** resulting posterior probability distribution is then explored to assess uncertainty,resolution,and correlation between model *** experiments are conducted to verify the accuracy and validity of the proposed analysis method in mapping the fracture geometry using synthetic pressure and tilt data.

关键词： Hydraulic fracture mapping Coupled inversion Tilt Treating pressure

Comparison of international mine reclamation bonding systems with recommendations for China

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International Journal of Coal Science & Technology 2017年第2期4卷 67-79页

作者： Linlin Cheng jeffrey g. Skousen Department of Surveying and Land Use School ofGeoscience and Surveying Engineering China University ofMining and Technology (Beijing) D11 Xueyuan RoadHaidian District Beijing 100083 China Division of Plant and Soil Sciences West VirginiaUniversity Morgantown WV 26506-6108 USA

Mine reclamation bonds are used in countries with mineral mining to ensure that reclamation of the mined area is completed. The United States, Canada, and Australia are countries with established mine reclamation bond programs, with the United States coal system having been in place since 1977. China implemented a bonding system in 1998 and by 2013 all 31 provinces had established a system. An effective bonding system must be conditioned on fair and enforceable nationwide reclamation standard, stimulate companies to conduct reclamation by forming economic incentives rather than penalties that become a liability, and allow for full public participation. Based on these principles, this paper compares seven important factors for a successful reclamation bonding system： laws and regulations, administrative authority, bond types, bond size, calculation method, bond release, and public participation. The results show variation in policies and procedures for bonding among countries. Using principles and policies primarily from the United States, China should establish a national reclamation bonding system with legislation that forms a national authority to oversee and enforce reclamation standards and bond requirements. In addition, China can expand bond financial types and strategies, set the size of reclamation bonds at the level of a third-party reclamation cost, and set unified standards for calculation. Phased bond release should be established with specific reclamation criteria for each phase of release. Finally, bonding regulations should clearly identify opportunities for full public participation in the process.

关键词： Mining legislation Administrative authority Bond types Size of bond Calculation method Bond release Public participation

Inherent Anharmonicity of Harmonic Solids

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Research 2022年第3期2022卷 409-419页

作者： Matthias T.Agne Shashwat Anand g.jeffrey Snyder Department Materials Science and Engineering Northwestern UniversityEvanstonILUSA

Atomic vibrations,in the form of phonons,are foundational in describing the thermal behavior of *** possible frequencies of phonons in materials are governed by the complex bonding between atoms,which is physically represented by a spring-mass model that can account for interactions(spring forces)between the atoms(masses).The lowest-order,harmonic,approximation only considers linear forces between atoms and is thought incapable of explaining phenomena like thermal expansion and thermal conductivity,which are attributed to nonlinear,anharmonic,***,we show that the kinetic energy of atoms in a solid produces a pressure much like the kinetic energy of atoms in a gas *** vibrational or phonon pressure naturally increases with temperature,as it does in a gas and therefore results in a thermal *** thermal expansion thermodynamically defines a grüneisen parameterγ,which is a typical metric of anharmonicity,we show that even a harmonic solid will necessarily have some anharmonicity.A consequence of this phonon pressure model is a harmonic estimation of the grüneisen parameter asγ≈(3/2)(3−4x^(2))/(1+2x^(2)),where x=vt/vl is the ratio of the transverse and longitudinal speeds of *** demonstrate the immediate utility of this model by developing a high-throughput harmonic estimate of lattice thermal conductivity that is comparable to other state-of-the-art *** linking harmonic and anharmonic properties explicitly,this study provokes new ideas about the fundamental nature of anharmonicity,while also providing a basis for new material engineering design metrics.

关键词： harmonic phonon linking

Thermal conductivity of complex materials

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National Science Review 2019年第3期6卷 380-381页

作者： g.jeffrey Snyder Matthias T.Agne Ramya gurunathan Department of Materials Science and Engineering Northwestern University

In the discussion and analysis of thermal properties (e.g. heat capacity, thermal conductivity) the Debye approximation is typically used to describe the collective behavior of lattice vibrations (phonons) in solid ma... 详细信息

关键词： Thermal conductivity of complex materials