The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
W. Moon - One of the best experts on this subject based on the ideXlab platform.
-
Surface Displacement Monitoring on Reclaimed Land Using PSInSAR Technique
2006 IEEE International Symposium on Geoscience and Remote Sensing, 2006Co-Authors: S.-e. Park, W. MoonAbstract:Large portion of western coast of Korean peninsular has been Reclaimed. Because the Reclaimed Land stands on weak foundation, the subsidence monitoring is required for civil protection. Newly developed PSInSAR technique is applied to monitor surface deformation on Reclaimed Land in Incheon Port. There was long lasting subsidence on test area up to 30 mm/year. APS and DEM error are also analyzed for the confirmation of the result.
S.-e. Park - One of the best experts on this subject based on the ideXlab platform.
-
IGARSS - Surface Displacement Monitoring on Reclaimed Land Using PSInSAR Technique
2006 IEEE International Symposium on Geoscience and Remote Sensing, 2006Co-Authors: S.-e. Park, Wooil M. MoonAbstract:Large portion of western coast of Korean peninsular has been Reclaimed. Because the Reclaimed Land stands on weak foundation, the subsidence monitoring is required for civil protection. Newly developed PSInSAR technique is applied to monitor surface deformation on Reclaimed Land in Incheon Port. There was long lasting subsidence on test area up to 30 mm/year. APS and DEM error are also analyzed for the confirmation of the result.
-
Surface Displacement Monitoring on Reclaimed Land Using PSInSAR Technique
2006 IEEE International Symposium on Geoscience and Remote Sensing, 2006Co-Authors: S.-e. Park, W. MoonAbstract:Large portion of western coast of Korean peninsular has been Reclaimed. Because the Reclaimed Land stands on weak foundation, the subsidence monitoring is required for civil protection. Newly developed PSInSAR technique is applied to monitor surface deformation on Reclaimed Land in Incheon Port. There was long lasting subsidence on test area up to 30 mm/year. APS and DEM error are also analyzed for the confirmation of the result.
K-s Kwon - One of the best experts on this subject based on the ideXlab platform.
-
Monitoring of Fugitive Dust Emission in Saemanguem Reclaimed Land
2020Co-Authors: H-s Hwang, S N Hong, Jp Bitog, K-s KwonAbstract:A study on fugitive dust dispersion was conducted in a 40,100ha Reclaimed Land located at the west coastal part of Korea. It was strongly suspected that during the dry months from March to May, dusts are generated in the Reclaimed Land and dispersed to the nearby surrounding areas. The dusts are composed mainly of minerals with high salinity that is very harmful to human's health such as skin and eye irritations. If these dusts are frequently inhaled, respiratory disease can arise. More so, the highly concentrated salty dusts can be very harmful to farms located nearby. In this study, a 3-year field experiment was conducted to regularly measure the locally suspended dust particles its dispersion mechanism. The collected dust samples were analysed to determine the dust concentration, size and components. The SPSS statistical program was used to establish a correlation between the collected dust particles in the selected measuring points and the collected dust particles at the Reclaimed Land. Results from this study in 2006, 2007 and 2008 showed that the changes in dust source are highly connected with the changes of dust concentration. The dust concentration shows a decreasing trend in 2008, and it is expected to decrease further as more dust source areas are being covered by plants. The chloride content, Na+ and Cl- ions were measured using SEM-EDX analysis and it was found out that significant amount was present in measuring points located in close proximity to the Reclaimed Land; lesser chloride content was detected in other measuring points. In Kim-je area, Cl- element was also very notable. The samples analyzed through SEM showed that most dust particles are large in size with and irregularity of dimension.
-
Simulation of an Array of Fences in Saemangeum Reclaimed Land Using CFD Technology
2020Co-Authors: Jp Bitog, S N Hong, K-s Kwon, H S Hwang, J-s. ChoiAbstract:This paper discusses about the quantitative effect of windbreak fences on wind velocity in the Reclaimed Land at Saemangeum semi-arid desert in South Korea. Windbreak fences were constructed in the Reclaimed Land purposely to prevent the generation and diffusion of dust. Using CFD simulations, the effects of fence porosity, fence height, and the distance between the adjacent fences were investigated. A wind tunnel experiment was initially conducted and data gathered were used to develop the CFD models. From the experiments and CFD simulations, the overall percentage difference of the measured velocities was 7.81% which is generally acceptable to establishing the reliability of the CFD models. The reduction effect on wind velocity was measured in between the adjacent fences up to a height of 0.6m from the ground surface. In terms of porosity (e= 0, 0.2, 0.4, 0.6), 0.2 was found to be the optimum value. Conversely, the effect of fence height (0.6, 0.8 and 1.0m) showed no significant difference; therefore, 0.6m height is recommended. In addition, the effect of distance between the adjacent fences (2, 4 and 6m) having a 0.2 porosity has decreased to about 75% regardless of the distance. In the case of the Reclaimed Land in Saemangeum, a decrease of 75% can prevent the generation and diffusion of dusts. However, the source of dusts is very large. Therefore, constructing an array of windbreak with 6m distance between them is deemed necessary.
-
Monitoring and CFD prediction for fugitive dust dispersion in the Reclaimed Land in Korea
2011 Louisville Kentucky August 7 - August 10 2011, 2020Co-Authors: H-s Hwang, Jessie P Bitog, Sewoon Hong, K-s KwonAbstract:Fugitive dust dispersion was studies in Saemangeum Reclaimed Land which developed 40,100 ha and located at the west coastal part of Korea. The salty dusts can affect to nearby farms. A computational fluid dynamics (CFD) model was developed to predict the dispersion of fugitive dust considering the topography of the area. Results showed that the dust concentrations are highly connected with the changes of dust source area. The dust concentration has been decreased from 2006 to 2010, and it is expected to decrease further as more dust source areas are being covered by plants. Dust dispersion ranges of CFD result were compared with that of field experiment at the same measuring points for the CFD validity, and the results at stable weather condition were very acceptable with a 6.8% error. On the basis of 10 µm particle size, the dispersion distance of fugitive dust resulted in about 2,500m with the wind velocity of 5.0m/s.
-
Development of a CFD Model to Predict the Dispersion of Fugitive Dust at the Reclaimed Land
2020Co-Authors: H S Hwang, S N Hong, Jp Bitog, K-s KwonAbstract:A computational fluid dynamics (CFD) model was developed to predict dispersion of fugitive dust from Saemangeum Reclaimed Land located in the western coast, Korea using topographical information. Though field experiment is ideal to understand real aerodynamic phenomenon, it is very difficult to find a correlation between weather condition and dust dispersion because of limited measuring points, labor and time. Moreover, the weather condition is unstable and unpredictable as well as cannot be controlled artificially. To overcome these limitations, CFD simulation has been used to analyze the dust dispersion phenomenon according to various weather conditions both quantitatively and qualitatively. The great effort was needed to improve CFD accuracy with topographical design, mesh structure, particle generation, and computational process. Dust dispersion ranges were compared between field experiment and CFD results at the same measuring points for the CFD validation, and the results were very acceptable at the stable weather condition with the error of 6.8% in average. The vertical dust concentration of the CFD results was also very similar with the general log-profile of fugitive and suspended dust presented by Gillies et al. (2004). The results showed that the dispersion of fugitive dust was mainly affected by particle size, wind speed, and wind direction. On the basis of 10 μm particle size, the diffused distance of fugitive dust resulted in 3,100m with the wind speed of 1.7m/s at 10m height from the ground while 6,300m with the wind speed of 3.9m/s.
-
Aerodynamic modeling of windbreaks in saemangeum Reclaimed Land
2010Co-Authors: Jp Bitog, S N Hong, K-s Kwon, H S Hwang, J-s. Choi, S-y. SongAbstract:This paper discusses the quantitative effect of windbreaks on wind velocity in the Reclaimed Land at Saemangeum in South Korea. The effectiveness of windbreaks to reduce the velocity to prevent the generation and diffusion of dust are very critical. Using CFD simulations, the effects of porosity, height, and distance between the adjacent fences as well as the effect of tree windbreaks were investigated. A wind tunnel test was conducted and data gathered were used to develop and validate the CFD models. From the experiments and CFD simulations, the overall percentage difference of the measured velocities was 7.20% which is acceptable to validate the CFD models. In the case of tree windbreak simulation, the methodologies to model the real effect of tree windbreak were conducted and compared such as the application of tree porosity, inertial resistance and input velocity. Results have shown that a windbreak fence with porosity of 0.2 and a height of 0.6 m and constructed in array at 6 m distance between them is necessary. Initial simulation of tree windbreak also has shown that the effect of trees on flow fields using inertial resistance can be appropriate to model the real condition, although this should still be strongly validated in field studies or in wind tunnels. This study proved that CFD can be an effective tool to investigate wind flow affected by windbreaks.
Jae-hyeok Jeong - One of the best experts on this subject based on the ideXlab platform.
-
change of vegetation characteristics and soil chemical properties at saemangeum Reclaimed Land in korea
Weed&Turfgrass Science, 2013Co-Authors: Jae-hyeok Jeong, Weon-young Choi, Ilbin ImAbstract:This study was conducted to investigate changes of vegetation and soil characteristics to tidal Land of Saemangeum Reclaimed Land from 2010 to 2012. Soil salinity was 0.16-22.3 dS m -1 in the first survey, while the three years later, it was decreased to 0.12-4.22 dS m -1 . Vegetations were classified as 6 families and 26 species but it was increased to 8 families and 31 species after three years. Numbers of average species in survey site were increased from 7.1 species to 10.6 species. Numbers of vegetation were increased at each survey sites except for survey site 7 : there was decreased halophyte according to decrease in the soil salinity. Biomass production was increased at low production site, and showed highest production in area of dominant vegetation as Phragmites communis. Simpson's dominance ratio(SDR) of main vegetation as Phragmites communis, Calamagrostis epigeios were increased but Suaeda maritima, Salicornia europaea, Puccinellia nipponica and Zoysia sinica were decreased.
-
Optimum Salinity Concentration and Nitrogen Fertilization for Salicornia herbaecea Growth in Reclaimed Land
The Journal of the Korean Society of International Agriculture, 2013Co-Authors: Jae-hyeok Jeong, Weon-young Choi, Nam-hyun Baek, Changhyu YangAbstract:Now in Korea, halophytes such as Salicornia herbacea and Spergularia marina are being cultivated as new income crops in southwestern coastal regions. So basis studies on halophytes’ growth characteristics is needed for developing a standard cultural practices of them. This study was carried out to investigate on cultivation of Salicornia herbacea, representative halophytes at new Reclaimed Land. First, in order to examine the characteristics of Salicornia herbacea germination by salinity (NaCl concentration 0 ~ 3%), germination tests were carried out. At the low-temperature 10C, germination of Salicornia herbacea was slow but lasted for 15 days at all salinities, and final germination rates were of 78 ~ 90%. At higher than 20C, maximum germination rate was showed within four days. Germination inhibition by salt was showed at NaCl concentration 3% and 30C. The second, to investigate on the growth characteristics of Salicornia herbacea by nitrogen fertilization, port experiments were conducted at the greenhouse. Salicornia herbacea’s buds began to be found after five days after sowing. Salicornia herbacea growth such as plant height, number of braches, etc. increased with increasing nitrogen fertilization. In order to investigate the growth characteristics by salinities, cultivation test of Salicornia herbacea was conducted in nutriculture with different salinities. In the plot without NaCl, the growth of Salicornia herbacea was very low, and it began to wither within one month. In plots with NaCl, the growth of Salicornia herbacea was well until concentrations of NaCl 500mM, and optimum NaCl concentration was 200mM for growth of Salicornia herbacea. Field verification experiments about the effect of nitrogen fertilization on transplanted Salicornia herbacea were conducted at the Saemangeum Reclaimed Land in Korea. There was a tendency to increase number of branches and plant length with increasing nitrogen fertilization. Amount of P2O5 and mineral element such as CaO, Na2O, K2O and MgO tended to increase with increasing nitrogen fertilization. However, there was no statistically significant difference.
-
incorporation effect of green manure crops on improvement of soil environment on saemangeum Reclaimed Land during sorghum sudangrass hybrid cultivation
Korean Journal of Soil Science and Fertilizer, 2012Co-Authors: Changhyu Yang, Nanhyun Baek, Jae-hyeok JeongAbstract:This study was carried out to investigate the incorporation effect of green manure crops (GMC) such as the hairy vetch on improvement of soil environment in Reclaimed Land during sorghumsudangrass hybrid (SSH) cultivation over the past three years from 2009 to 2011. Plots consisted of conventional fertilization (CF) and incorporation of GMC were divided by rates of additional nitrogen fertilizer () and decreased percentage of 30 50 70 100 fertilization in addition to non nitrogen fertilization (NNF). Soil physico-chemical properties, growth and yield potential were examined. The results were as follows. The testing soil was showed strong alkaline saline soil with low organic matter contents and less available phosphate while exchangeable sodium and magnesium were higher. Soil salinity was increased during cultivation of summer crop. However, SSH was not affected by salt content. The fresh weight of GMC at incorporation time was . Content of total nitrogen at incorporation time was 3.09% and the C/N ratio was 12.8. Fresh and dry matter yield of SSH were higher in the order of 30%, CF, N50%, N70%d, N100%, and NNF. Fresh and dry matter yield of SSH increased in the order of CF (, ), N contents from 30% to 9%. Soil physical properties, such as bulk density were decrease with incoporation of GMC, while porosity was increased. Soil chemical properties, such as pH was decreased while content of exchangeable calcium, available phosphate, and organic matter were increased. Also contents of exchangeable sodium and potassium were decreased with incorporation of GMC than those before experiment. Thus, we assumed that incorporation of hairy vetch was more effective that can lead to reduce chemical nitrogen fertilizer and to improve soil environment in cultivating SSH on Saemangeum Reclaimed Land.
-
Incorporation Effect of Green Manure Crops on Improvement of Soil Environment on Saemangeum Reclaimed Land during Sorghum×Sudangrass Hybrid Cultivation
Korean Journal of Soil Science and Fertilizer, 2012Co-Authors: Changhyu Yang, Nanhyun Baek, Jae-hyeok JeongAbstract:This study was carried out to investigate the incorporation effect of green manure crops (GMC) such as the hairy vetch on improvement of soil environment in Reclaimed Land during sorghumsudangrass hybrid (SSH) cultivation over the past three years from 2009 to 2011. Plots consisted of conventional fertilization (CF) and incorporation of GMC were divided by rates of additional nitrogen fertilizer () and decreased percentage of 30 50 70 100 fertilization in addition to non nitrogen fertilization (NNF). Soil physico-chemical properties, growth and yield potential were examined. The results were as follows. The testing soil was showed strong alkaline saline soil with low organic matter contents and less available phosphate while exchangeable sodium and magnesium were higher. Soil salinity was increased during cultivation of summer crop. However, SSH was not affected by salt content. The fresh weight of GMC at incorporation time was . Content of total nitrogen at incorporation time was 3.09% and the C/N ratio was 12.8. Fresh and dry matter yield of SSH were higher in the order of 30%, CF, N50%, N70%d, N100%, and NNF. Fresh and dry matter yield of SSH increased in the order of CF (, ), N contents from 30% to 9%. Soil physical properties, such as bulk density were decrease with incoporation of GMC, while porosity was increased. Soil chemical properties, such as pH was decreased while content of exchangeable calcium, available phosphate, and organic matter were increased. Also contents of exchangeable sodium and potassium were decreased with incorporation of GMC than those before experiment. Thus, we assumed that incorporation of hairy vetch was more effective that can lead to reduce chemical nitrogen fertilizer and to improve soil environment in cultivating SSH on Saemangeum Reclaimed Land.
-
establishment of perfect drainage period for reduction of salt injury and improvement of grain filling ratio in the newly Reclaimed Land
The Korean Journal of Crop Science, 2011Co-Authors: Weon-young Choi, Changhyu Yang, Jae-hyeok JeongAbstract:This research was carried out to establish perfect-drainage time in order to stabilize rice yield and improve rice quality. Treatments of perfect-drainage were conducted 5 days interval during 25 days to 50 days after heading date in the field of Saemangeum Gyehwa, newly Reclaimed Land. Accumulated temperature after heading date in 2010 increased about and precipitation amount decreased a little compared to normal year harvesting time. Average panicle number was 16.5 and spikelet per panicle was 88. Perfect drainage time treatment after 40~50 days was 3% higher in percent ripened grain and 0.6 g heavier in 1,000 grain weight than treatment after 25~35 days. There was no difference of rice yield between perfect drainage time treatment after 25 days and 30~35 days, but rice yield was 7~8% higher in treatment after 40~50 days than 25 days. Head rice ratio in treatment after 35 days was the highest and the sooner perfect drainage time, the lower protein content. Soil moisture negatively correlated with soil hardness and EC in this result. With this results, we proposed that the time of perfect drainage in newly Reclaimed Land to stable rice production is 40~50 days after heading date.
Gihong An - One of the best experts on this subject based on the ideXlab platform.
-
Growth of Bioenergy Crop Miscanthus sacchariflorus cv. Geodae 1 on Barren Reclaimed Land Applied with Solidified Sewage Sludge in Landfill Sites
The Korean Journal of Crop Science, 2015Co-Authors: Gihong An, Yun-hui Jang, Kyoung Ran Um, Gyeong-dan Yu, Yun-ho MoonAbstract:This study firstly provides basic data for selection of cultivatable bioenergy grass in barren Reclaimed Lands applied with solidified sewage sludge. The experimental plots consisted of a plot containing Reclaimed Land mixed with solidified sewage sludge (MSS 50), a plot covered by solidified sewage sludge (CSS 100), and an original Reclaimed soil plot (ORS). The growth, biomass production of bioenergy grasses and soil chemical properties were investigated in each experimental plot for 5 years. The organic matter (OM) and total nitrogen (T-N) content in both MSS 50 and CSS 100 were considerably higher than those in ORS. In bioenergy grasses, M. sacchariflorus cv. Geodae 1 showed an excellent growth and adaptability on Reclaimed Land applied with solidified sewage sludge. The application of solidified sewage sludge may provided soil nutrition in the Reclaimed Land due to the fact that bioenergy crops grew better in soils applied with solidified sewage sludge than in untreated soils, and treated soils had higher OM and T-N content than untreated soils. This study suggests that M. sacchariflorus cv. Geodae 1 is the most suitable biomass feedstock crop for biomass production and that solidified sewage sludge may be used as a soil material for cultivation of bioenergy grass on Reclaimed Lands.
-
Transitional Patterns of Vegetation in Reclaimed Land Applied with Solidified Sewage Sludge
The Korean Journal of Crop Science, 2015Co-Authors: Kyoung Ran Um, Gihong An, Yun-hui Jang, Gyeong-dan Yu, Younho MoonAbstract:This study was firstly conducted to investigate changes of vegetation and soil characteristics in Reclaimed Land applied with solidified sewage sludge for the cultivation of bioenergy crops. Each vegetation survey site was approximately on the inside of each experimental plot that consisted of 50% (A-1), 30% (A-2), 15% (A-3), and 5% (A-4) mixture of solidified sewage sludge, and original Reclaimed soil (ORS). After the application of solidified sewage sludge, we monitored the changes of vegetation and soil properties for three years. In first year, soil pH, electrical conductivity (EC) and exchangeable content was 9.4~10.8, , and , respectively, while three years later, it decreased to 8.1~8.4, , and , respectively. These results indicated that several of soil chemical elements which have nagative impacts on the plant growth in the plots of mixtures of solidified sewage sludge, steadily declined as the years go by. The vegetations in each survey site were recorded as 6 families and 12 species in 2014, while the vegetations were not occurred at all survey sites in 2012, and only halophytes as Phragmites australis and Suaeda asparagoides were observed in 2013. Diversity of vegetation, which was calculated by shannon index (H'), increased as the season progressed at each experimental plot applied with solidified sewage sludge. In original Reclaimed soil, however, there was showed the high community similarity of vegetation due to the fact that P. australis and S. asparagoides were only occurred for survey periods.
-
the effects of solidified sewage sludge as a soil cover material for cultivation of bioenergy crops in Reclaimed Land
The Korean Journal of Crop Science, 2012Co-Authors: Gihong An, Yonghwan Choi, Younho Moon, Surnteh Bark, Yong Mi Yoon, Kwang Guen ParkAbstract:ABSTRACT To determine the possibility of solidified sewage sludge for use as a soil cover material in Reclaimed Land, the growth of energy crops and soil chemical properties investigated in each experimental plots during 2 years (2010and 2011). The experimental plots consisted of the mixing with solidified sewage sludge plot (SS50), the covering with solidified sewage sludge plot (SS100), and the original re-claimed Land plot (ORL) on Reclaimed Land for the intended Landfill in Sudokwon Landfill Site Management Corporation (SLC). Plant height, measured in the second year (2011), was highest in the Geodae 1 grown at plots treated with solidified sewage sludge. The growth of energy crops cul-tivated in both SS50 and SS100 were better than in ORL. The contents of organic matter (OM) and total nitrogen (T-N) at both SS50 and SS100 were considerably higher than that of the ORL over 2 years. However, the soil from ORL showed higher salinity with high contents of exchange-able Na + cation than that of SS50 and SS100 over 2 years. We consider that soil chemical and physical properties on Reclaimed Land used in this study could be improved by the application of solidified sewage sludge due to following reasons. Firstly, the application of solidified sewage sludge may provide soil nutrients on Reclaimed Land i.e. the growth of energy crops better than in ORL, resulted in more OM and T-N contents in SS50 and SS100. Secondly, the top layers mixed or covered with solidified sewage sludge on Reclaimed Land may be prevented the salinity accumulation due to capillary rise to surface soil, and improved the cultivation layer for effectively propagating the rhizomes of energy crops. Thus the solidified sewage sludge may be a great soil cover materials for cultivation of bioenergy crops in Reclaimed Land.
-
effects of application of solidified sewage sludge on the growth of bioenergy crops in Reclaimed Land
The Korean Journal of Crop Science, 2011Co-Authors: Gihong An, Yonghwan Choi, Younho Moon, Surnteh BarkAbstract:This study was carried out to obtain the basic data for selecting the cultivatable bioenergy crops through application of solidified sewage sludge in Reclaimed Lands. The experimental plots consisted of the mixing with solidified sewage sludge plot (SS50), the covering with solidified sewage sludge plot (SS100), and the original Reclaimed Land plot (ORL) on Reclaimed Land for the intended Landfill in Sudokwon Landfill Site Management Corporation (SLC). The growth of energy crops (Geodae-Uksae 1, Miscanthus sacchariflorus, and Phragmites australis) were investigated from May to October, 2010 in each experimental plot. The soil from ORL showed higher salinity with high contents of exchangeable cation than that of SS50 and SS100. Soil properties on Reclaimed Land used in this study must be improved by increasing the buffering capacity of saline with the treatment of solidified sewage sludge due to the fact that the contents of organic matter (OM) in both of SS50 and SS100 were higher than that of the ORL. Thus the growth of energy crops cultivated in the solidified sewage sludge plots were better than in ORL. Geodae-Uksae 1 which showed an excellent adaptability on Reclaimed Land treated with the solidified sewage sludge has considerably higher biomass than those of other energy crops (M. sacchariflorus and P. australis). This study suggested that Geodae-Uksae 1 is the most suitable biomass feedstock crop for bioenergy productions, and the solidified sewage sludge may be possible to utilize as a soil cover materials for cultivation of bioenergy crops in Reclaimed Land.