벼 생육기간중(生育期間中)의 논에서의 수분소비(水分消費)에 관(關)한 연구(硏究)(II)

민병섭 ( Byung Sup Min ) 한국농공학회 1969 韓國農工學會誌 : 전원과 자원 Vol.11 No.4

The results of the study on the consumptine use of irrigated water in paddy fields during the growing season of rice plants are summarized as follows. 1. Transpiration and evaporation from water surface. 1) Amount of transpiration of rice plant increases gradually after transplantation and suddenly increases in the head swelling period and reaches the peak between the end of the head swelling poriod and early period of heading and flowering. (the sixth period for early maturing variety, the seventh period for medium or late maturing varieties), then it decreases gradually after that, for early, medium and late maturing varieties. 2) In the transpiration of rice plants there is hardly any difference among varieties up to the fifth period, but the early maturing variety is the most vigorous in the sixth period, and the late maturing variety is more vigorous than others continuously after the seventh period. 3) The amount of transpiration of the sixth period for early maturing variety of the seventh period for medium and late maturing variety in which transpiration is the most vigorous, is 15% or 16% of the total amount of transpiration through all periods. 4) Transpiration of rice plants must be determined by using transpiration intensity as the standard coefficient of computation of amount of transpiration, because it originates in the physiological action.(Table 7) 5) Transpiration ratio of rice plants is approximately 450 to 480. 6) Equations which are able to compute amount of transpiration of each variety up to the heading-flowering peried, in which the amount of transpiration of rice plants is the maximum in this study are as follows: Early maturing variety ; Y=0.658+1.088X Medium maturing variety ; Y=0.780+1.050X Late maturing variety ; Y=0.646+1.091X Y=amount of transpiration ; X=number of period. 7) As we know from figure 1 and 2, correlation between the amount evaporation from water surface in paddy fields and amount of transpiration shows high negative. 8) It is possible to calculate the amount of evaporation from the water surface in the paddy field for varieties used in this study on the base of ratio of it to amount of evaporation by atmometer(Table 11) and Table 10. Also the amount of evaporation from the water surface in the paddy field is to be computed by the following equations until the period in which it is the minimum quantity the sixth period for early maturing variety and the seventh period for medium or late maturing varieties. Early maturing variety ; Y=4.67-0.58X Medium maturing variety ; Y=4.70-0.59X Late maturing variety ; Y=4.71-0.59X Y=amount of evaporation from water surface in the paddy field X=number of period. 9) Changes in the amount of evapo-transpiration of each growing period have the same tendency as transpiration, and the maximum quantity of early maturing variety is in the sixth period and medium or late maturing varieties are in the seventh period. 10) The amount of evapo-transpiration can be calculated on the base of the evapo-transpiration intensity (Table 14) and Tablet 12, for varieties used in this study. Also, it is possible to compute it according to the following equations with in the period of maximum quantity. Early maturing variety ; Y=5.36+0.503X Medium maturing variety ; Y=5.41+0.456X Late maturing variety ; Y=5.80+0.494X Y=amount of evapo-transpiration. X=number of period. 11) Ratios of the total amount of evapo-transpiration to the total amount of evaporation by atmometer through all growing periods, are 1.23 for early maturing variety, 1.25 for medium maturing variety, 1.27 for late maturing variety, respectively. 12) Only air temperature shows high correlation in relation between amount of evapo-transpiration and climatic conditions from the viewpoint of Korean climatic conditions through all growing periods of rice plants. 2. Amount of percolation 1) The amount of percolation for computation of planning water requirment ought to depend on water holding dates. 3. Available rainfall 1) The available rainfall and its coefficient of each period during the growing season of paddy fields are shown in Table 8. 2) The ratio (available coefficient) of available rainfall to the amount of rainfall during the growing season of paddy fields seems to be from 65% to 75% as the standard in Korea. 3) Available rainfall during the growing season of paddy fields in the common year is estimated to be about 550 millimeters. 4. Effects to be influenced upon percolation by transpiration of rice plants. 1) The stronger absorbtive action is, the more the amount of percolation decreases, because absorbtive action of rice plant roots influence upon percolation.(Table 21, Table 22) 2) In case of planting of rice plants, there are several entirely different changes in the amount of percolation in the forenoon, at night and in the afternoon during the growing season, that is, is the morning and at night, the amount of percolation increases gradually after transplantation to the peak in the end of July or the early part of August (wast or soil temperature is the highest), and it decreases gradually after that, neverthless, in the afternoon, it decreases gradually after transplantation to be at the minimum in the middle of August, and it increases gradually after that. 3) In spite of the increasing amount of transpiration, the amount of daytime percolation decreases gadually after transplantation and appears to suddenly decrease about head swelling dates or heading-flowering period, but it begins to increase suddenly at the end of August again. 4) Changs of amount of percolation during all growing periods show some variable phenomena, that is, amount of percolation decreases after the end of July, and it increases in end August again, also it decreases after that once more. This phenomena may be influenced complexly from water or soil temperature(night time and forenoon) as absorbtive action of rice plant roots. 5) Correlation between the amount of daytime percolation and the amount of transpiration shows high negative, amount of night percolation is influenced by water or soil temperature, but there is little no influence by transpiration. It is estimated that the amount of a daily percolation is more influenced by of other causes than transpiration. 6) Correlation between the amount of night percoe, lation and water or soil temp tureshows high positive, but there is not any correlation between the amount of forenoon percolation or afternoon percolation and water of soil temperature. 7) There is high positive correlation which is r=+0.8382 between the amount of daily percolation of planting pot of rice plant and amount and amount of daily percolation of non-planting pot. 8) The total amount of percolation through all growin. periods of rice plants may be influenced more from specific permeability of soil, water of soil temperature, and otheres than transpiration of rice plants.

벼생육기간중(生育期間中)의 논에서의 수분소비(水分消費)에 관(關)한 연구(硏究)

민병섭 ( Byung Sup Min ) 한국농공학회 1969 韓國農工學會誌 : 전원과 자원 Vol.11 No.2

스프링클라관개 방법에 관한 연구

민병섭 ( Byung Sup Min ) 한국농공학회 1971 韓國農工學會誌 : 전원과 자원 Vol.13 No.1

벼생육기간중(生育期間中)의 논에서의 수분소비(水分消費)에 관(關)한 연구(硏究)(II)

민병섭 ( Byung Sup Min ) 한국농공학회 1969 韓國農工學會誌 : 전원과 자원 Vol.11 No.3

충남지역(忠南地域)의 지하수개발(地下水開發)에 관(關)한 조사(調査)

민병섭 ( Byung Sup Min ),조성섭 ( Sung Sup Cho ) 한국농공학회 1969 韓國農工學會誌 : 전원과 자원 Vol.11 No.4

Resulties of research on the capacity of ground water of 994 concrete-pipe-wells and 97 infiltration-gallerys in ground-water-developement-works region executed from March to Julyin 1969, in Choong Chung Nam Do, and research on the quality of ground water for 88 wells for home-use around of River Geum Area, are as fellows: (1) Thickness of aquifer is no more than 2.85m averagely even at river-overflowed plain, alluvial plain and valley plain area that are estimated to contain ground water mostly. And so, it is guessed that ground water capacity is not much especially. (2) Soil of aquifer of the above area is sand or gravel and it is estimated to be good for ground water developement and its mean permeability coefficient is bout 2.5×10^-3(m/sec), and its porosity is about 33.9%. (3) The quality of ground water is good for irrigation water exception of delta plain area. Warm water plan is to need for irrigation water when water temperature is less than 19 degrees below zero. (4) Prospect of ground water developement, judging from quality and quantity, expects to lay infiltration gallery under the ground at river bed in order to utilize under-flow-water of river bed, river-overflowed plain, alluvial plain and valley plain that ground level is less than 50m. (5) Collectable water volume of under-flow-water of river bed is about 450 to 750㎥/day to be able to irrigate 3ha to 5ha of the cultivated land in case that infiltration gallery length is 50m and its depth is about 5m. (6) Collectable water volume at river-overflowed plain, alluvial plain and valley plain area, is estimated 150㎥/day to be able to irrigated 1ha of the cultivated land.

물방울의 입도 측정법에 관한 고찰

민병섭 ( Byung Sup Min ) 한국농공학회 1970 韓國農工學會誌 : 전원과 자원 Vol.12 No.4

스프링클라 관개방법에 관한 연구(II)

민병섭 ( Byung Sup Min ) 한국농공학회 1972 韓國農工學會誌 : 전원과 자원 Vol.14 No.1

한국(韓國)의 지역별(地域別) 토공가능일수(土工可能日數)에 관(關)한 조사연구(調査硏究)

안병기 ( Byung Ki Ahn ),민병섭 ( Byung Sup Min ),박승범 ( Seung Bum Park ) 한국농공학회 1971 韓國農工學會誌 : 전원과 자원 Vol.13 No.3

1. Being seen at the table (20), the number of days which monthy average air temperatures are three degrees of Celsius thermometer (3℃) or more, is the highest marks to be 365 days at Cheju, secondly, 334 days at Pusan, and, Ulsan, Pohang, Mokpo, Yosu and Ullung-Do which all are coastal region are all 306 days, besides, all north area of Taegu and Kwang ju have 275 days consquently, there are 90 days, differance between maximum and minimum. 2. Being seen at the table (22), freezing dates to be influenced upon earth works are obtained, if (1) item is subtracted from 365 days one year. 3. Being seen at the table(18), number of rainy days of which records are 1 millimeter and over to be influenced upon earth through works, days which monthly average air temperatures are 3℃ or more, is the maximum to be 100 days at Cheju and its minimum is 60 days at Taegu. Every other region show 70 days or so. But Ullung-Do is 90 days. 4. Being seen at the table (26), the numbers of annual earth works possibility days(4) are obtained, if the values (3) which number of rainy days more than 1 millimeter during the same period are multiplied by 1.27 (coefficient of hindrance to earth works) are subtracted from the number of days which monthly average air temperatures 3℃ or more [(1)-(3)=(4)]. 5. The number of annual earth works possibility days by regional groups is the maximum to be 242 days at Pusan, and Cheju are 239 days. Other regions are from 218 days to 181 days, namely, they are about 200 days.

밭에의 토양수분(土壤水分) 소비기구(消費機構)에 관(關)한 연구(硏究)

유능환 ( Neung Hwan Yoo ),민병섭 ( Byung Sup Min ) 한국농공학회 1974 韓國農工學會誌 : 전원과 자원 Vol.16 No.4

This experiment of which aim contribute to plan irrigation system so as to increase forage crop yields, was conducted to estimate evapotranspiration amount of forage crops and to find out system of consumed water in a pasture-ground. The results obtained by this study are as follows: 1. The general weather conditions which, were closely related to the evapotrannpiration of forage crops were nearly same as those of the average year with the exception that temperature of May and June were slightly low. 2. According to the investigation of potential evapotranspirations (P.E) or forage crops and its changes during growing periods, changes of tenday P.E. were high significant according to the harvesting period. P.E of Alfalfa of which yield was the largest was the biggest. 3. Althrough the correlations between P.E. and meteorological factors were irregular oming to three-time harvesting, correlation between ten-day evapotraspiration amount and copper plated pan evaporation or solar radiation was high positive significant. 4. Predicting formulas of P.E. were led by weather factors, and also relatione between P.E. and weather factors were showed as figure. from the these formulas, P.E. may be calculated by weather factors. 5. Predicting formulas of P.E. were led by mean temperature and copper plated pan evaporation, and by mean temperature and solar radiation. As computed values and measured values showed in figure, these formulas were high signiflent. 6. In the total consumed soil water duration of 10 days which, was non-rain period from 12th to 21th of August, Alfalfa was the largest 48.1mm, second, Orchard grass 40.1mm and Fescue 37.6mm, and Ladino clover was the smallest 37.1mm, also, order of each forage crop yield amound. was same to the abov. Order of soil moisture extraction rate of soil layer of all the for forage crops dulation of ten-day was soil layer 1 which was largest, soil layer 2, 3, and 4 Reviewing the the first five-day and the second five day, in the first five-day, order of that of all the forage crops was same to the above, but in the second five-day, that of soil layer 2 or 3 was more than the of soil layer 1.

韓國에서의 灌漑用貯水池의 計劃洪水量에 關한 硏究 : 確率理論을 基礎로한 based on probability theorem

閔丙燮 忠南大學校 1962 論文集 Vol.2 No.-

It is well known fact that one of the most important factors which influence the safty and economic design of irrigation reservoir is the rational computation of the designing basic rainfall that is the basis to determine the maximum flood discharge. While, maximum daily rainfall among the observation records for 10 or 20 years period has been adopted comonly as the basic rainfall for irrigation reservoir, in Korea. Such a method is not only dangerous plan, but also are unreasonable and uneconomical, and it must be sublated in future espicially by reason of meteorological observation in number and years of record are short period except a few stations This is the reason why the rational basic rainfall must be decided for the designing of the irrigation reservoir and in this study was conducted by following procedures. Of course various methods have been used in analyzing flood data and estimated the flood discharge based on probability theorem in this paper. (1) The probability rainfall-it may be expected to occure once in 200 years intervals-was calculated based on annual maximum daily rainfall at 17 stations which have meteorological observation equipment and those values are shown in tab. (10 12.) (2) Those values are compared with the greatest one among the annual maximum daily rainfall and then investgated observation period and distribution of observation data, and thus are decided basic rainfall for determining the matimum flood dis charge, showed in tab (14). Those values in tab (14) will be adapted for the basic rainfall in its safety and economic aspect. In above mentioned process, the basic rules was adopted as follows: (1) Where records have been maintained less than 50 years should be estimated 200 years' probability rainfall based on observation data. (2) Where records have been maintained through relatively long period such as more than 50 years, should be adopted the greatest value among the annual maximum rainfall as a rule, but at the same time, should be calculated 200 years probability rainfall as (1), and after compared with the greatest value among the data and through analyzing should be decided the basic rainfall. On the other hand, to investegate the permanent safety of the basic extra flood discharge was decided based on following rules and those values are shown in tab. (18). (1) In case observation records that is the greatest value among the annual maximum daily rainfall during more than 50 years period was adopted as the basic of designing, 1.5 or 2.0 times as much as the basic rainfall should be decided as the basic extra flood discharge. (2) In case 200 years probability rainfall was adopted as the basis of designing, the basic extra flood discharge that is increased 20% quantity should be adopted.