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Impact of temperature and precipitation lapse rate on hydrological modelling over Himalayan Gandak River Basin

Journal of Mountain Science 2022年第12期19卷 3487-3502页

作者： Brijesh KUMAR Dipankar ROY Venkataraman LAKSHMI Department of Hydraulic and Water Resource engineering Bule Hora UniversityBule Hora 144Ethiopia Department of Civil engineering Madanapalle Institute of Technology&ScienceMadanapalle 517325India engineering systemsand environment Universityof VirginiaCharlottesvilleVA22904USA

The hydrology of Himalayan region is influenced by temperature lapse rate(TLAPS)and precipitation lapse rate(PLAPS).Therefore,hydrological modeling considering TLAPS and PLAPS is crucial to manage the water resources in these *** this research,Himalayan Gandak River basin is considered as the study area where TLAPS and PLAPS vary significantly due to high altitude of *** assess the impact of TLAPS and PLAPS on water balance components,Soil Water Assessment Tool(SWAT)model was calibrated(2000-2007)and validated(2008-2014)on daily time step for three projects i.e.,Reference Project(RP),Snowmelt Project(SP)and distributed elevation band snowmelt project(SWAT-ETISM).The analysis discloses that SWAT-ETISM model(which has TLAPS and PLAPS parameters)outperforms the RP and the SP models in predicting streamflow with improved statistical indicators R2=0.88,NSE=0.84 and PBIAS=***,it was observed that SWAT-ETISM model comprehensively improved the streamflow statistics by improving the snow water equivalent and water balance components through the consideration of TLAPS and PLAPS values for the ***,the proposed SWAT-ETISM model can be used for estimation of the water budget at the high-altitude and data scarce alpine Himalayan regions and worldwide,where PLAPS and TLAPS are substantial due to altitudinal variation.

关键词： Streamflow SWAT-ETISM Himalayan Regions Water balance Temperature lapse rate Precipitation lapse rate

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Low-cycle fatigue behaviour of Mg-9Gd-4Y-2Zn-0.5Zr alloys with different structures

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Journal of Magnesium and Alloys 2023年第9期11卷 3382-3393页

作者： Jinsheng Ji Jie Zheng Leichen Jia Yong Zhang Yunfei Jia Yusha Shi Heng Zhang Yong Xue School of Materials Science and engineering North University of ChinaTaiyuan 030051China Key Laboratory of Pressure systemsand Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China

The strain-controlled cyclic deformation behaviour of Mg-9Gd-4Y-2Zn-0.5Zr with different structures was investigated. Alloys were prepared by solution, extrusion and pre-ageing extrusion, and the microstructures before and after the fatigue tests were *** results indicated that the bimodal structure owned the better performance in fatigue test, which was attributed to the higher yield strength. For the equiaxed structure, cyclic hardening induced stress concentration until the failure. Stable cyclic deformation and persistent cyclic softening played an important role at the low and high strain amplitudes, respectively. This was attributed to the formation of fine grains relieving the stress concentration during cyclic loading. In addition, residual twins were observed in equiaxed structure to induce crack, and the bimodal structure effectively restrain it.

关键词： Strain-controlled fatigue Bimodal structure Fractography Mg-Gd-Y-Zn-Zr alloy

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