An assessment of uncertainties in VS profiles obtained from microtremor observations in the phased 2018 COSMOS blind trials     

Asten  Michael W.  Yong  Alan  Foti  Sebastiano  Hayashi  Koichi  Martin  Antony J.  Stephenson  William J.  Cassidy  John F.  Coleman  Jacie  Nigbor  Robert  Castellaro  Silvia  Chimoto  Kosuke  Cornou  Cécile  Cho  Ikuo  Hayashida  Takumi  Hobiger  Manuel  Kuo  Chun-Hsiang  Macau  Albert  Mercerat  E. Diego  Molnar  Sheri  Pananont  Passakorn  Pilz  Marco  Poovarodom  Nakhorn  Sáez  Esteban  Wathelet  Marc  Yamanaka  Hiroaki  Yokoi  Toshiaki  Zhao  Don 《Journal of Seismology》2022,26(4):757-780

Journal of Seismology - Site response is a critical consideration when assessing earthquake hazards. Site characterization is key to understanding site effects as influenced by seismic site...  相似文献   

Site flatfile of Korea meteorological administration’s seismic stations in Korea     

Cho  Hyung-Ik  Lee  Moon-Gyo  Ahn  Jae-Kwang  Sun  Chang-Guk  Kim  Han-Saem 《Bulletin of Earthquake Engineering》2022,20(11):5775-5795

Bulletin of Earthquake Engineering - This study constructed a flatfile with the information useful to satisfy the site characterization requirements of Korea Meteorological Administration’s...  相似文献   

Practical considerations for the segmented-flow analysis of nitrate and ammonium in seawater and the avoidance of matrix effects     

Tae Keun Rho  Stephen Coverly  Eun-Soo Kim  Dong-Jin Kang  Sung-Hyun Kahng  Tae-Hee Na  Sung-Rok Cho  Jung-Moo Lee  Cho-Rong Moon 《Ocean Science Journal》2015,50(4):709-720

In this study we describe measures taken in our laboratory to improve the long-term precision of nitrate and ammonia analysis in seawater using a microflow segmented-flow analyzer. To improve the nitrate reduction efficiency using a flow-through open tube cadmium reactor (OTCR), we compared alternative buffer formulations and regeneration procedures for an OTCR. We improved long-term stability for nitrate with a modified flow scheme and color reagent formulation and for ammonia by isolating samples from the ambient air and purifying the air used for bubble segmentation. We demonstrate the importance of taking into consideration the residual nutrient content of the artificial seawater used for the preparation of calibration standards. We describe how an operating procedure to eliminate errors from that source as well as from the refractive index of the matrix itself can be modified to include the minimization of dynamic refractive index effects resulting from differences between the matrix of the samples, the calibrants, and the wash solution. We compare the data for long-term measurements of certified reference material under two different conditions, using ultrapure water (UPW) and artificial seawater (ASW) for the sampler wash.  相似文献   

Evaluation of a regional ocean reanalysis system for the East Asian Marginal Seas based on the ensemble Kalman filter     

Seo  Gwang-Ho  Choi  Byoung-Ju  Cho  Yang-Ki  Kim  Young Ho  Kim  Sangil 《Ocean Science Journal》2015,50(1):29-48

Ocean Science Journal - This study introduces the East Asian Marginal Seas (EAMS) reanalysis system and evaluates its products from 1982 to 2006. The EAMS reanalysis system consists of an ocean...  相似文献   

Development of the Operational Oceanographic System of Korea     

Park  Kwang-Soon  Heo  Ki-Young  Jun  Kicheon  Kwon  Jae-Il  Kim  Jinah  Choi  Jin-Yong  Cho  Kyoung-Ho  Choi  Byoung-Ju  Seo  Seung-Nam  Kim  Young Ho  Kim  Sung-Dae  Yang  Chan-Su  Lee  Jong-Chan  Kim  Sang-Ik  Kim  Seonjeong  Choi  Jung-Woon  Jeong  Sang-Hun 《Ocean Science Journal》2015,50(2):353-369

Ocean Science Journal - The Korea Operational Oceanographic System (KOOS) was developed at the Korea Institute of Ocean Science and Technology (KIOST) to produce real-time forecasting and...  相似文献   

A note on linear dispersion and shoaling properties in extended Boussinesq equations   总被引：1，自引：0，他引：1  

C. Lee  Y. -S. Cho  S. B. Yoon 《Ocean Engineering》2003,30(14):1849-1867

A set of optimum parameter α is obtained to evaluate the linear dispersion and shoaling properties in the extended Boussinesq equations of [Madsen and Sorensen, 1992 and Nwogu, 1993], and [Chen and Liu, 1995]. Optimum α values are determined to produce minimal errors in each wave property of phase velocity, group velocity, or shoaling coefficient relative to the analytical one given by the Stokes wave theory. Comparisons are made of the percent errors in phase velocity, group velocity, and shoaling coefficient produced by the Boussinesq equations with a different set of optimum α values. The case with a fixed value of α = −0.4 is also presented in the comparison. The comparisons reveal that the optimum α value tuned for a particular wave property gives in general poor results for other properties. Considering all the properties simultaneously, the fixed value of α = −0.4 may give overall accuracies in phase velocity and shoaling coefficient for all the types of Boussinesq equations selected in this study.  相似文献   

Two-dimensional wave-current interaction with a locally enriched quadtree grid system     

Koo-Yong Park  Alistair G.L. Borthwick  Yong-Sik Cho   《Ocean Engineering》2006,33(2):247-263

Wave-induced currents may drive nearshore mixing and transport processes, including coastal pollutant dispersion, littoral drift, and long-term morphological changes through beach erosion and accretion. In this study, a numerical model is newly developed to simulate wave climate and localized currents in complicated coastal environments. The model developed is based on a quadtree grid system. The two-dimensional hydrodynamic governing equations are solved by using an explicit Adams-Bashforth finite difference scheme. Effects of wave breaking, shoaling, refraction, diffraction, wave-current interaction, set-up and set-down, turbulent mixing, bed friction, and shoreline movement are incorporated in the model. Results are presented for set-up at a beach in a flume due to normally incident waves, and longshore currents generated by oblique waves on a plane beach.  相似文献   

Changes in spatial variations of sap flow in Korean pine trees due to environmental factors and their effects on estimates of stand transpiration     

Minkyu Moon  Taekyu Kim  Juhan Park  Sungsik Cho  Daun Ryu  Sanguk Suh  Hyun Seok Kim 《山地科学学报》2016,13(6):1024-1034

It is difficult to scale up measurements of the sap flux density (Js) for the characterization of tree or stand transpiration (E) due to spatial variations in JS and their temporal changes. To assess spatial variations in the sap flux density of Korean pine (Pinus koraiensis) and their effects on E estimates, we measured the Js using Granier-type sensors. Within trees, the Js decreased exponentially with the radial depth, and the Js of the east aspects were higher than those of the west aspects. Among trees, there was a positive relationship between Js and the tree diameter at breast height, and this positive relationship became stronger as the transpiration demand increased. The spatial variations that caused large errors in E estimates (i.e., up to 110.8 % when radial variation was ignored) had varied systematically with environmental factors systematic characteristics in relation to environmental factors. However, changes in these variations did not generate substantial errors in the E estimates. For our study periods, the differences in the daily E (E _D) calculated by ignoring radial, azimuthal and tree-to-tree variations and the measured E _D were fairly constant, especially when the daily vapor pressure deficit (D__D) was higher than 0.6 kPa. These results imply that the effect of spatial variations changes on sap flow can be a minor source of error compared with spatial variations (radial, azimuthal and tree-to-tree variations) when considering E estimates.  相似文献   

A study on the predictability of the transition day from the dry to the rainy season over South Korea     

Sang-Min Lee  Ji-Eun Nam  Hee-Wook Choi  Jong-Chul Ha  Yong Hee Lee  Yeon-Hee Kim  Hyun-Suk Kang  ChunHo Cho 《Theoretical and Applied Climatology》2016,125(3-4):449-467

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Ambient air metallic elements (Mn,Fe, Zn,Cr, Cu,and Pb) pollutants sources study at a rural resident area near Taichung Thermal Power Plant and Industrial Park: 6-month observations     

Guor-Cheng Fang  Yuan-Jie Zhuang  Yu-Chen Kuo  Meng-Hsien Cho 《Environmental Earth Sciences》2016,75(7):587

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