골프장 페어웨이에 적합한 크리핑 벤트그래스 품종 선발

차영기,김경덕,박대섭,김두환,Cha, Young-Gi,Kim, Kyung-Duck,Park, Dae-Sup,Kim, Doo-Hwan 한국잔디학회 2011 한국잔디학회지 Vol.25 No.2

This study was conducted to evaluate the growth characteristics of creeping bentgrass cultivars for fairway of golf course at Yeoju area in Korea. At germination and coverage rate of creeping bentgrass, 'Shark' and 'CY-2' were excellent, 'L-93', 'Alpha', 'T-1 was in order', respectively. Visual qualities of 'Shark' and 'CY-2' also were excellent. Especially, 'Shark', 'T-1', and 'CY-2' showed excellent visual quality in summer days, the critical times for the bentgrass fairway quality. 'Shark', 'CY-2' and 'T-1' were excellent in Chlorophyll contents throughout the evaluation period. Chlorophyll content of 'T-1' was maintained very high in summer. 'CY-2' and 'Shark' showed the best root growth at the beginning of the study and contained longer and hairy roots. Which might make these two cultivars' water absorption easier than other's. NDVI (normalized difference vegetation index)of 'Shark', 'L-93' and 'CY-2' was excellent, respectively. 'T-1' showed the highest density and 'Shark', 'CY-2', 'Alpha', 'L-93' was followed by. The density of 'T-1' was rather increased in summer season, while those of other cultivars were decreased. Three diseases such as anthracnose, brown patch, and dollar spot, were appeared during the evaluation period. 'T-1' and 'L-93' were very sensitive to anthracnose which occurred at the beginning days of the study. The most susceptible cultivars to brown patch were 'Alpha' and 'L-93'. 'T-1' was the least resistant to dollar spot which occurred at the same time with brown patch. 본 연구는 페어웨이 조성에 적합한 크리핑 벤트그래스 품종을 선발하기 위해 수행 되었다. 'Shark'와 'CY-2' 품종의 시각적 품질이 가장 우수하였으며, 크리핑 벤트그래스 페어웨이에서 가장 많이 고려 되어야 하는 하절기 시각적 품질은 'Shark', 'CY-2', 'T-1', 'Alpha', 'L-93' 순이었다. 포지 조성 초기 엽록소함량이 가장 우수한 품종은 'Shark'와 'CY-2' 그리고 'T-1' 이다. 'T-1'은 하절기 색상이 매우 짙게 유지가 되었다. 조성 초기부터 'CY-2'와 'Shark'의 뿌리 길이가 길고 우수했으며 잔뿌리가 많아 수분 흡수가 매우 용이할 것으로 판단된다. 조성 초기부터 가장 우수한 식생 지수를 보인 것은 'Shark'와 'L-93' 그리고 'CY-2'였다. 가장 높은 밀도를 보인 품종은 'T-1' 이였으며 다른 품종과 다르게 하절기 밀도가 떨어지지 않고 오히려 증가하였다. 'T-1' 다음으로 'Shark'가 높은 밀도를 보였고, 'CY-2', 'Alpha', 'L-93'의 순으로 밀도가 높았다. 실험기간 동안 탄저병, 브라운패취, 달라스팟이 발병 하였으며 'CY-2'가 가장 내병성이 강하였고 3가지 병 모두 내병성을 보였다. 본 연구 결과 5개 품종 중 'CY-2'와 'Shark'가 골프장 페어웨이용으로 가장 적합하였다.

臺形水路問題의 解決을 위한 非次元法에 대한 小考

車英基 단국대학교 1980 論文集 Vol.14 No.-

We have known that expressing the various flow equation in terms of proper non-dimensional parameters is very important. Such a method of approach besides being independent of units used has heen shown to be also convenient and expedient from the standpoint of computation. Further, it is very much useful in displaying certain properties of the flow phenomenon which otherwise remain; it also supplies a useful simulation techniques.

Sinuosity가 작은 水路에서의 흐름 模型

車英基,李宗석 檀國大學校 出版部 1991 論文集 Vol.25 No.2

密度가 一定한 受容水에서의 浮力 Jet의 數値解

車英基 단국대학교 1984 論文集 Vol.18 No.-

By using some basic and specific assumptions and formulas (conservation equations, geometric relations, and initial conditions); the deflections of jet trajectory, the variation of concentration, the dilution ratios, and the velocity at the trajectory axis were derived on the horizontally discharged bouyant jet into homogeneous denser ambient fluids.

정현파형하천의 이행특성

차영기,배동만 한국수자원학회 1992 물과 미래(한국수자원학회지) Vol.25 No.2

This study is a model on the Migration Characteristics which developed by using the equations for conservation of mass, momentum and for lateral stability of the streambed, an the model can be examined for magnitude and location of near-bank bed scour as well as rates and direction of meander migration in which sine-Wave type rivers(SWR) of the small sinuosity. It is evident from this study that the transverse bed slope factor B' and transverse mass flux factor $ play significient roles, and show reasonable that the values are B'=4.0 and $=0.4 respectively . It will be a useful guide in planning, design, construction, and development of SWR river-basin projects. 본 연구는 굴곡도(sinuosity)가 작은 정현파형(SWR)하천에서 사행 이행의 크기와 방향 및 제방부근의 하상세굴 위치와 크기를 예측할 수 있는 이행특성 모형을 운동량 방정식, 질량보존법칙, 하상 안정식을 적용하여 개발하였다. 본연구에서 황방향 하상계수 B'와 질량 이송계수 a 는 SWR 하천에서 중요한 역할을 하는 변수임이 확인되었으며, 그 값은 각각 B'는 4.0, a는 0.40이 합리적인 값으로 나타났다. 본 모형은 SWR 하천 유역의 개발계획 및 설계시 유용한 정보를 제공해 줄 것이다.

골프장 페어웨이에 적합한 크리핑 벤트그래스 품종 선발

차영기,김경덕,박대섭,김두환 한국잔디학회 2011 Weed & Turfgrass Science Vol.25 No.2

This study was conducted to evaluate the growth characteristics of creeping bentgrass cultivars for fairway of golf course at Yeoju area in Korea. At germination and coverage rate of creeping bentgrass, ‘Shark’ and ‘CY-2’ were excellent, ‘L-93’, ‘Alpha’, ‘T-1 was in order’, respectively. Visual qualities of ‘Shark’ and ‘CY-2’ also were excellent. Especially, ‘Shark’, ‘T-1’, and ‘CY-2’ showed excellent visual quality in summer days, the critical times for the bentgrass fairway quality. ‘Shark’, ‘CY-2’ and ‘T-1’ were excellent in Chlorophyll contents throughout the evaluation period. Chlorophyll content of ‘T-1’ was maintained very high in summer. ‘CY-2’ and ‘Shark’showed the best root growth at the beginning of the study and contained longer and hairy roots. Which might make these two cultivars’ water absorption easier than other’s. NDVI (normalized difference vegetation index)of ‘Shark’,‘L-93’ and ‘CY-2’ was excellent, respectively. ‘T-1’ showed the highest density and ‘Shark’, ‘CY-2’, ‘Alpha’, ‘L-93’was followed by. The density of ‘T-1’ was rather increased in summer season, while those of other cultivars were decreased. Three diseases such as anthracnose, brown patch, and dollar spot, were appeared during the evaluation period. ‘T-1’ and ‘L-93’ were very sensitive to anthracnose which occurred at the beginning days of the study. The most susceptible cultivars to brown patch were ‘Alpha’ and ‘L-93’. ‘T-1’ was the least resistant to dollar spot which occurred at the same time with brown patch. 본 연구는 페어웨이 조성에 적합한 크리핑 벤트그래스품종을 선발하기 위해 수행 되었다. ‘Shark’와 ‘CY-2’ 품종의 시각적 품질이 가장 우수하였으며, 크리핑 벤트그래스 페어웨이에서 가장 많이 고려 되어야 하는 하절기 시각적 품질은 ‘Shark’, ‘CY-2’, ‘T-1’, ‘Alpha’, ‘L-93’ 순이었다. 포지 조성 초기 엽록소함량이 가장 우수한 품종은‘Shark’와 ‘CY-2’ 그리고 ‘T-1’ 이다. ‘T-1’은 하절기 색상이 매우 짙게 유지가 되었다. 조성 초기부터 ‘CY-2’와 ‘Shark’의 뿌리 길이가 길고 우수했으며 잔뿌리가 많아 수분 흡수가 매우 용이할 것으로 판단된다. 조성 초기부터 가장우수한 식생 지수를 보인 것은 ‘Shark’와 ‘L-93’ 그리고‘CY-2’였다. 가장 높은 밀도를 보인 품종은 ‘T-1’ 이였으며 다른 품종과 다르게 하절기 밀도가 떨어지지 않고 오히려 증가하였다. ‘T-1’ 다음으로 'Shark’가 높은 밀도를 보였고, ‘CY-2’, ‘Alpha’, ‘L-93’의 순으로 밀도가 높았다. 실험기간 동안 탄저병, 브라운패취, 달라스팟이 발병 하였으며 ‘CY-2’가 가장 내병성이 강하였고 3가지 병 모두 내병성을 보였다. 본 연구 결과 5개 품종 중 ‘CY-2’와 ‘Shark’가 골프장 페어웨이용으로 가장 적합하였다.

스포츠시설업, 이제는 서비스가 관건이다!

차영기 한국스포츠정책과학원 2005 스포츠과학 Vol.91 No.-

蛇行河川에서의 흐름特性 : 準蛇行形 및 一定曲率形 水路中心으로 Flow Analysis in the Sinouos Channel and Constant Curvature Channel

車英基,이종석 단국대학교 1993 論文集 Vol.27 No.-

This paper is a model of the calculation of flow field and bed topography for sinuous channels and constant curvature channels with erodible beds. A small perturbation approach is used to linearize the governing equations as equations describing the flow field and the bed topography. The model predicts satisfactorily the secondary flow and the transverse bed slope. The model of Kitanidis and Kennedy(1984) was shown to highly overpredict the magnitude of the secondary flow. By comparsion with laboratory and field data it is shown that our flow model gives substantially better results than the other models.

망상하천에서의 유량과 한계수로경사의 상관성

차영기,김이현 단국대학교 1996 論文集 Vol.30 No.-

The purpose of this study is to compare the theoretical results of determined critical channel slope with the field data in a braided river. Three dimensionless variable quantities could be obtained by the dimension analysis with 6 variables related with the transportation of bedload. Critical channel slope could be determined using these. As a study reach we chose a small part of Miho-channel which is well developed braided river in Kum-river watershed, and devided it into 25 sections of 4,680 meters in total length. Theoretical critical channel slope appeared at the section No. 21 nearly, and in reality, meandering channel form began to appear instead of braided form at near section No. 23 downstream about 320 meters from section No. 21. The critical channel slope was 1/1,591 in theory but in field it is 1/1,613. Therefore, these results turned out to be good ones.

만곡 수로의 횡방향 하상경사와 흐름특성

차영기,이대철 한국수자원학회 1991 물과 미래(한국수자원학회지) Vol.24 No.1

This study is for simulating to the model which analyzes flow characteristics and transverse bed slopes in a coarse-streambed of the meandering alluvial channels. Using the equations for conservation of mass, momentum, and for lateral stability of the streambed, a linear differential equation of transverse bed slope is derived from the flow characteristics in curved channels. Its solutions are solved by the Sine-generated curve method(SCM) and compared with results of field measurements. Lag distances by the maximum transverse bed slope and velocity profiles will predict risk sections of concave bank under floods. 본 연구는 만곡 충적수로의 거친하상(재료의 입경이 2mm이상)에 있어 횡방향 하상경사와 흐름특성을 해석하기 위한 모형을 개발하는데 있다. 질량 보존법칙, 운동량 방정식 및 하상 안정식을 적용하여 만곡 수로의 흐름특성을 수로 중심선에서의 횡방향 하상경사에 관한 일반식으로 유도하고, 그 해를 Sine-generated curve method(SCM)에 의해 구하였으며, 실측치와 비교, 분석하였다. 최대 횡방향 하상경사와 유속분포에 의한 지체 거리(lag distances)는 홍수시 제방의 위협단면을 예측할 수 있을 것이다.