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증발계(蒸發計) 증발량(蒸發量)의 시계렬(時系列) 및 통계적(統計的) 특성(特性) 분석(分析)
구자웅 ( Ja Woong Koo ) 한국농공학회 1977 韓國農工學會誌 : 전원과 자원 Vol.19 No.3
In order to estimate furture consumtive use, some statistical characteristics of 22-year pan evaporation data at four selected stations were calculated in this study. Districal distribution, trend analysis and time-series, statistical and periodic analysis for annual, monethly and ten-day values were performed in the statistical analysis. The stations are Seoul, Taeku, Jeonju and Mokpo for monthly data, and Suweon data are compared to the reported Penman values. The results are as followed: 1. Annual evaporation ranged to 990-1,375mm varying with the locations of the stations. The Districal distribution of evaporation in the Republic is shown in Fig. 1. 2. The trend analysis for annual evaporation resulted in detail in Table 2 and Fig. 2, through simple moving average methods. The results show relatively short-period data of about 10 years would be acceptable for field use. 3. The means and dispersions of monthly evaporation at four stations are detailed in Table 3. 4. The monthly evaporation approached to the trend of normal distribution Fig. 3 showed the examples of normal distribution for each typical monthly data. 5. The correlograms detailed in Fig. 4, shows the time-series characteristics of monthly evaporation, whose periodic term should be twelve months. 6. The periodic analysis for monthly evapolation results in Table 4. Fig. 5 shows the comparison of estimated values to actual and the trend approaches Shuster's periodic trend. 7. A periodic description of days after March 1 for irrigation periods was developed to predict ten-day evaporation in Fig. 6. The ten-day evaporation is different in the distribution form and occurence period of maximum values from the reported Penman's man's evapotranspiration.
우리나라 서남해안 간척지 및 간석지 토양의 화학적 특성 (II) - 인의 형태별 함량 분포 -
구자웅 ( Koo Ja Woong ),손재권 ( Son Jae Gwon ),조재영 ( Cho Jae Young ) 한국농공학회 2006 한국농공학회논문집 Vol.48 No.2
The chemical fractions of phosphorus were investigated in the soils of reclaimed and natural tidelands of southwest coastal area of Korea. The content of total-P varied to ranged from 322 to 614 mg/kg dry weight with a mean value of 467 mg/kg. The order of different fractions of phosphorus in reclaimed tideland soils was as follows: 1) inorganic phosphorus: Ca-P > Fe-P > Al-P > reductant soluble Fe-P. 2) organic phosphorus: Inositol-P > nucleic acid-P > phospholipid-P. The content of Al-P showed negative correlation with organic matter content but showed positive correlation with pH. The content of Fe-P showed negative correlation with clay mineral content but showed positive correlation with organic matter content. Reductant soluble Fe-P and Ca-P were no correlation with soil properties. The content of inositol-P showed highly positive correlation with clay mineral, organic matter content, and CEC.
구자웅 ( Koo Ja Woong ),최진규 ( Choi Jin Kyu ),손재권 ( Son Jae Gwon ),조경훈 ( Cho Kyong Hun ) 한국농공학회 2000 한국농공학회 학술대회초록집 Vol.2000 No.-
This study was performed to analyze the changes of electrical conductivity with increasement of water requirements for desalinization in reclaimed tidelands and to obtain the basic data for developing prediction techniques of desalinization to be applicable in the beginning of tideland reclamation. Two different desalinization experiments were conducted through the leaching method by subsurface drainage and the rinsing method by surface darainage, using the samples of silt soil and silt loam soil collected in 5 units of tideland reclamation projects. Regression equations were obtained in order to investigate the changes of electrical conductivity during the desalinization of reclaimed tidelands and to estimate water requirements for desalinization.
구자웅 ( Koo Ja Woong ),최진규 ( Choi Jin Kyu ),손재권 ( Son Jae Gwon ),이기성 ( Lee Ki Sung ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
Ibis study was performed to analyze desalinization effects on gypsum treatments m reclaimed tidelands and to obtain the basic data for developing prediction techniques of desalinization to be applicable in the beginning of tideland reclamation. In this study, the reclamation experiments with 4 treatments were conducted through the leaching method, using the samples of silt soil and silt loam soil collected in 5 units of tideland reclamation projects. The electrical conductivity, exchangeable sodium percentage and hydraulic conductivity were analyzed in order to investigate the effects of desalinization for reclaiming the tidelands with high salt concentration.
구자웅 ( Ja Woong Koo ),손재권 ( Jae Gwon Son ),최진규 ( Jin Kyu Choi ),이동욱 ( Dong Wook Lee ),송재도 ( Jae Do Song ) 한국농촌계획학회 2002 농촌계획 Vol.8 No.3
The PTDRT model as prediction techniques for desalinization in reclaimed tidelands was developed and verified whether it is applicable to reclaimed tidelands at the beginning stage. The changes of salt concentration during desalinization, the water requirements and period required for desalinization, were simulated according to soil properties and desalinization methods by regression analyses. The program was also designed to systematize input data and analysis data associated with desalinization. and to confirm the results by a graphic form. All input data and the results can be printed after the form of a typical report.
우리나라 서남해안 간척지 및 간석지 토양의 화학적 특성 (I) - 중금속 오염물질의 형태별 함량 분포 -
구자웅 ( Koo Ja Woong ),손재권 ( Son Jae Gwon ),조재영 ( Cho Jae Young ) 한국농공학회 2006 한국농공학회논문집 Vol.48 No.1
The chemical fractions of heavy metals were investigated in the soils of reclaimed and natural tidelands of southwest coastal area of Korea. The distribution pattern of each heavy metal in different fractions was in the order: 1) Cu : organic bound > organic complex > residual > exchangeable = water soluble. 2) Cr : residual > organic bound > organic complex > water soluble > exchangeable. 3) Pb : organic bound > residual > organic complex > water soluble > exchangeable. 4) Cd : residual > organic bound > organic complex > water soluble = exchangeable. 5) Zn : organic bound > residual > organic complex > water soluble > exchangeable. The content of residual Zn showed positive correlation with organic matter content but organic bound Zn showed negative correlation with CEC. The content of residual and exchangeable Cd showed highly positive correlation with organic matter content but residual, organic bound, and exchangeable Cd showed negative correlations with CEC. Water soluble Pb showed positive correlation with CEC but organic bound Pb showed negative correlation with CEC.