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RISS 인기검색어
- 검색키워드
- 저자 : 최예환 ( Choi Ye-hwan ) (검색결과 66 건)
- 무료
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농업용수 개발을 위한 보의 실태조사와 그 분석 (강원도를 중심으로)
최예환,황은,Choi, Ye-Hwan,Hwang, Eun 한국농공학회 1978 한국농공학회논문집 Vol.20 No.1
The construction of the equipment of water utilization has been developed since the ancient Korea period, 1906 in order to develope and modernize the agriculture. As the results, 83% of total paddy field area, 1,268,949.8 ha has developed into the irrigated paddy field, and the rest of area, 17% has remained nonirrigated paddy field (due to the data of the statistics of 1975). The ratio of the irrigated paddy field area among the total weir was marked 13.14% (area, 137,926.3 ha) and the third grade of total irrigated paddy field in accordance with the facilities of water utilization. In case of Gangwon-Do, the 44.18 percentage of the total irrigated paddy field, 51,057.2ha has been and pointed out first grade. As the results, we found out the following articles : 1. The total weir, 1,641 that sumed concrete weir 647 and conventional weir 967 has been constructed and has irrigated the 44.l8% of total irrigated paddy field of Gangwon-Do. 2. These weirs have been public possession of those villages to be 96.1 percentage of total weir and was controled by them. 3. Those weirs that were constructed across tributary (first, secondary and third tributary) at vallies (elevation 100∼1,000m) have marked that 45 percentage of total number of catchment area has 100∼1,000 ha, and 70 percentage of total number of basin area has been below 10 ha and has constructed about 5 of step-shape. 4. The construction of most weirs has became generally about 50m length, about 1m height. 5. The 80 percentage of newly constructed concrete weir has aged below 10 years. It seemed that 79 percentage of conventional weir has aged over 20 years and 41% of contructed weir has needed to be improved quickly. 6. If privious weirs, 296 will constructed newly, they can irrigate 3,600.8 ha of paddy field and 45.8% of total irrigated paddy field will have been and will contribute to the production of much rice.
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고등채소의 한해를 방지하기 위한 포장 용수량 결정에 관한연구
최예환 ( Choi Ye Hwan ),이회만 ( Lee Hoe Man ) 한국농공학회 1973 韓國農工學會誌 : 전원과 자원 Vol.15 No.2
The purpose of this study is to find out and determine the minimum consumptive use of water for Korean cabbage and turmp, so that the minimum water requirement can be secured always for a stable cultivation of these vegetables regardless of weather conditions. The experiment was conducted in two periods; first one from May to July and second one from August to October, each experiment with two varieties of cabbage and two varieties of radish with 2 replicants and 15 treatments. The results found from the above are briefly as follows: 1. Since the mean soil moisture equivalent 64 days after the treatment was 28.5% and the soil moisture content at the time was 2.67% which is far less than that of the wilting point, the crop seemed to be extremely caused by a drought. 2. The rate of 51 days after the seeding, soil moisture content of plot No.2 where irrigation has been continuous was the highest or 21.3%, whereas the plot No.14 without irrigations was 11.2% and the lowest. Therefore, the soil moisture content for the minimum qrowth seemed to be 20%. 3. The consumptive coefficient of Blaney and Criddle on cabbage in two periods were K=1.14 and 0.97 respectively, and on radish in two periods were K=1.06 and 0.86 respectively, thus, cabbage was higher than radish. The consumptive coefficient in the first experiment (May-July) was 0.17 to 0.20 higher than the 2nd experiment (August-October). 4. Nomally, cabbage and radish germinate within one week, however, the germination ot these crops which were treated with a suspended water supply from the beginning took two full weeks. 5. When it elapsed 30 days after seeding, the conditions in plot 1, 2 and 3 were fairly good however, the crops in the plops other than these showed a withering and the leaves were withered and changed into high green due to an extrem drought. Though it was about same at the beginning, the drought damage on cabbage was worse than that on radish period, and the reasos for this appears in the latter that the roots are grown too deep. 6. The cabbage showed a high affinity between treated plots and varieties. Consequently, it can be said that cabbage is very suseptive to drought damage, and the yield showed a difference of 35% to 56% depending on the selection oe varieties. 7. The radish also showed a high affinity between the treated plots, however, almost us affinity existed between varieties. Therfore, the yield of radish largely depends on the extent of drought, and the selection of variety does not affect at all. 8. The normal consumptive use on cabbage is 0.62ℓ/sec, while that on radish is 0.64 ℓ/sec, and the minimum optimum water requirement that was obtained in this study is 4,000cc/day/㎥ or 0.462ℓ/ha.
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소유역(小流域)에 있어서 강수(降水)-유출(流出)의 특성(特性)에 관(關)한 연구(硏究) - 한국(韓國)과 네델란드를 중심(中心)으로 -
최예환 ( Ye Hwan Choi ) 한국농공학회 1983 韓國農工學會誌 : 전원과 자원 Vol.25 No.3
In order to estimate the flood discharge and to control it in the design of agricultural hydraulic structure, espacially to derive the unit hydrograph from small watersheds, Banweol G-1 (5.317㎢), G-2 (4.096㎢) in Korea and the Hupselse Beek (6.5㎢) in the Netherlands, the author analysed and considered in this paper the data observed and calculated in total eight models such as Matrix Inversion, Nash-Model, J-Model, 2-Parallel Unequal Reservoir and 2,3,4,5-Parallel Equal Reservoir. The unit hydrograph to be deduced by their models was tested whether to be significant or not. It was found out that the runoff to be estimated from the observed precipitation was calculated by the Convolution Integral. The results were as follows. 1. The shape of the precipitation distribution in Banweol and Hupselse watershed was applied to χ<sup>2</sup>-test and Kolmogorov-Smirnov test, and double exponential distribution function was acknowledged to the reasonable distribution. 2. Whether there is homogeneity between precipitation and watershed among Banweol, Suwon and Nammyeon site was examined by Bartlett’s test, and those watersheds were identified to be within the same boundary of homogeneity watershed. 3. The objective function values of the observed and calculated runoff for unit hydrog raph of Matrix Inversion, Nash-Model, and J-Model in Hupselse watershed were 0.2925, 0.3734 and 0.4054 respectively and were optimized, but only Matrix Inversion was not proper because it was shown to have minus values with DUH. 4. Also the objective function values of 2-parallel unequal reservoir and 2,3,4,5-parallel equal reservoir were estimated to be 0.4423, 0.2817, 0.2508, 0.2859 and 0.2516 respectively and they all are considered to be optimized. 5. As the objective function values of Nash-Model and J-Model for the unit hydrograph in Banweol G-1 watershed in Korea were marked to be 0.0054 and 0.0557, they were considered to be optimized. But, as the values of G-2 watershed were 0.0102 and 1.1511 respectively, they were too large comparatively to be considered as not optimized. 6. J-values which are expressed the characteristics of the watershed were 245.4 and 533.5 respectively by J-Model in Banweol G-1 and G-2 watershed. The G-1 watershed having smaller J-values was judged to be more optimized than that of G-2. 7. The objective function values between the observed runoff and the calculated runoff that was obtained from unit hydrograph and precipitation in Hupselse watershed by Convolution Integral were estimated to be 15.75, 12.21 and 13.04 for Matrix Inversion, Nash-Model and J-Model respectively. Among them, Nash-Model and J-Model were shown to be satisfactory and optimized. 8. The objective function values between the observed runoff and the calculated runoff that was estimated from the unit hydrograph and precipitation in Hupselse watershed by Convolution Integral were marked to be 13.04, 12.73, 12.87 and 13.27 for 2-parallel unequal reservoir and 2,3,4,5-parallel equal reservoir model respectively. They all are expressed to be good and optimized. 9. The objective function values between the observed runoff and the calculated runoff that was obtained the unit hydrograph and precipitation data in Banweol G-1 watershed of Korea by Convolution Integral were estimated to be 1.5539 and 6.6749 for Nash-Model and 1.9365 and 6.5086 for J-Model respectively, and they all are good and optimized. 10. The objective function values between the observed runoff and the calculated runoff that was computed from the unit hydrograph and precipitation data in Banweol G-2 watershed by Convolution Integral were shown to be 1.5198 and 1.0769 for Nash-Model, and 1.6798 and 19.4302 for J-Model. The former values were taken to be optimized but the latter ones were considered not to be optimized and proper. 11. In the case of Banweol watershed, the Nash-Model was taken to be proper and to be applicable to the same cases, but as the J-Model has J-value subject to the charaterictics of watershed and the J-value governs the optimiztion of J-Model, continuous studies and analyses are required with long-term and reliable observed data. 12. The error between the observed and the calculated peak discharge for unit hydrograph was shown to be 0. 00% in Banweol G-1 watershed and 0.94% in Banweol G-2 water shed in the case of Nash-Model as shown in Table 25, and 9.09% in Banweol G-1 and 14.28% in Banweol G-2 watershed in the case of J-Model respectively. All three ot her values but the last one are accepted as to be within the boundary of the allowable error. 13. Generally Nash-Model was considered to be optimized in small watershed of Korea and J-Model was judged to be applicable to the watershed having the shape of leaf comparatively gentle slope as in the case of Banweol G-1 watershed.
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