• 한국관개배수논문집
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• 제18권1호
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• pp.4-17
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• 2011

The standard design methodology was suggested to construct wetland system for reducing non-point source pollution from Saemangeum reclaimed paddy land. To set for the design flow and concentrations, runoff and water quality survey were conducted during the irrigation period in 2008 at Gyehwa reclaimed paddy land located at near Saemangeum lake. It is rational that 1ha is the optimum constructed wetland size. To meet this size, the moderate drainage area of reclaimed paddy field was 50ha under the conditions that rainfall is 30mm, average runoff coefficient is 0.83, and runoff capture ratio is 0.6. At these condition, the runoff volume from 50ha was 10,520 $m^3/d$ including base flow during irrigation period. To select the optimum wetland system, several case studies were conducted by focusing on the tidal reclaimed land areas having wetland systems in Seokmun. Pond-Wetland system was selected as the standard model because of showing the highest reduction efficiency. Single variable regression equation were delivered to estimate effluent water concentrations from the designed wetland by using long-term monitoring data from the Seokmun experiment site. The effluent concentration from the designed wetland using these equation were showed moderately range.

• 한국토양비료학회지
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• 제46권6호
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• pp.417-425
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• 2013

This study investigated the runoff from rice paddy located on reclaimed fine sandy loam soil to provide data for the development of policies to protect water quality of estuaries. Total N (TN), Total P (TP) concentrations and runoff loads at outlet were monitored from 2006 to 2008. Soil phosphate adsorptivity was measured and compared with typical paddy soil in watersheds. TP concentration of the paddy water and TP runoff loads were much greater than those of typical paddy field in watershed because phosphate adsoptivity in reclaimed paddy field of fine sandy loam appeared to be a third of those of typical paddy soils by relatively low soil OM and high sand content of the reclaimed soil. Thus, nutrient runoff, particularly phosphate from the reclaimed paddy field needs to be managed more thoroughly to protect estuarine water quality.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2000년도 학술발표회 발표논문집
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• pp.637-642
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• 2000

In order to control the water quality of freshwater lake in tidal reclaimed land, it is needed to evaluate accurate amount of pollutant loadings from reclaimed paddy field. This study was carried out to investigate the pollutant loading from a reclaimed paddy field. Site of the study was a paddy field located in Taeho reclaimed land, with an areas of 38.5 hectares. The runoff loadings of Total-Nitrogen, Total-Phosphorus, and Chemical Oxygen Demand were 49.5 kg/㏊/yr, 3.2 kg/㏊/yr and 154.0 kg/㏊/yr, respectively. The runoff loadings in Total-Nitrogen and Total-Phosphorus from this study were much higher values than the pollutant load factor of Total-Nitrogen and Total-Phosphorus from the paddy field published by the Ministry of Environment.

• 한국환경과학회지
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• 제27권8호
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• pp.641-650
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• 2018

Paddy-upland rotation system is one of the important cropping system for improving soil quality and crop productivity. we conducted to investigate the effect of paddy-upland rotation system on soil properties and crop productivity in reclaimed tidal land. The paddy-upland rotation could be effective to conserve soil water contents and prevent from salt damage when cultivating upland crops. The first two years of maize cultivation after rice cultivation could be effective to secure stable production. However, in case of soybean crop, the rotation effect might be lower than that of maize. In the first year, the yield of soybean was 214 kg/10a. In the second and third year, the yields of soybean decreased consecutively to 152, 123 kg/10a respectively. In this paper, it would be suggested that maize be cultivated for up to two years and soybean be cultivated for one year after rice crop grown in reclaimed tidal land. This study could be provide basic data of the physico-chemical properties applicable to paddy-upland rotation system at reclaimed tidal lands.

• 한국관개배수논문집
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• 제17권2호
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• pp.105-114
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• 2010

Tidal land reclamation provided water resources and land for agriculture and contributed stable crop production. However, climate change by global warming disrupts the hydrologic circulatory system of the earth resulting in sea level rise and more frequent flood for reclaimed arable land. Recently, Suyu reclaimed paddy field in Jindo-gun experienced prolonged inundation after heavy rainfall and there is a growing risk of flood damage. Onsite survey and flood analysis using GATE_Pro model of Korea Rural Corporation were conducted to investigate causes of flooding. To perform the analysis, input data such as inflow hydrograph, the lowest elevation of paddy field, neap tide level, management level of Gunnae estuary lake at the time of the flood were collected. Flood analysis confirmed that current drainage facilities are not enough to prevent 20year return period flood. The result of analysis showed flooding more than 24hours. Therefore, flood mitigation alternatives such as sluice gate expansion, installation drainage pumping station, refill paddy land, and catch canal were studied. Replacing drainage culvert of Suyu dike to sluice gate and installing drainage pumping station at the Gunne lake were identified as an effective flood control measures. Furthermore, TM/TC (SCADA) system and expert for gate management are required for the better management of drainage for estuary dam and flood mitigation.

• 한국작물학회지
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• 제59권4호
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• pp.526-531
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• 2014

본 연구는 간척지에서 사료용벼를 재배하여 조사료를 생산함으로써 간척지 이용률 증진과 조사료생산의 두가지 가능성을 검토해보고자 일반답과 간척답에서 사료용벼를 재배하여 생육특성, 총체수량 및 사료가치 등을 조사하였다. 1. 출수기는 일반답에서 8월15일에서 8월30일, 간척답에서 8월14일에서 8월 29일이었으며, 간척답이 일반답보다 1~2일 빨랐으며, 목우는 일반답에서 8월 26일, 간척답에서 8월 27일로 수원 544호를 제외하고는 가장 늦었다. 2. 초장은 일반답에서 105~135 cm범위이었고, 간척답에서 97~126 cm범위였으며 일반답에서는 목양이 간척답에서는 수원544호가 가장 컸다. 주당경수는 일반답과 간척답 모두 녹양이 16개로 가장 많았고 총체수량은 일반답은 $15.26{\sim}23.24MT\;ha^{-1}$, 간척답은 $11.94{\sim}18.89MT\;ha^{-1}$범위이었으며 목우벼가 두지역에서 가장 많이 생산되었다. 각품종별 수량은 일반답에 비하여 78~84% 수준이었다. 3. 단백질 함량은 일반답에서는 녹양벼가 높았으나 간척답에서는 6.7~8.7%로서 상대적으로 낮은 수치를 보였고 목양벼가 8.7%로 가장 높았다. 각 품종별 NDF는 31.2~55.5% 수준을 나타냈으며 ADF는 일반답에 비하여 큰 차이를 보이지 않았으며 가소화 양분총량을 계산해본 결과 일반답에서 목우벼가 71.2%로 가장 높았고 전체적으로 60%이상의 함량을 보여 간척지에서 재배하여도 사료로서의 가치는 충분할 것으로 생각되었다. 4. TDN수량을 비교해본 결과 일반답에서 TDN수량은 목우벼가 $16.54MT\;ha^{-1}$로 가장 높았으며 간척답에서도 $12.69MT\;ha^{-1}$로 가장 높은 수량을 보였다. 5. 이상의 결과로 간척지에서 사료용벼를 재배할 경우 일반답에 비하여 80%정도의 수량을 보여 간척지에서 재배가능성을 확인하였으며 목우를 재배할 경우 수량 및 사료가치면에서 가장 좋을 것으로 생각된다.

• 농업과학연구
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• 제27권2호
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• pp.141-157
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• 2000

This study is aimed at identifying the socio-economic value of the total area of 23,500ha of paddy field which will be reclaimed in year 2003. In Korea, tidal land reclamation projects has been carried out not only for paddy field expansion to meet national food security but also for national land expansion to cope with the shortage of land supply in implementing urbanization and industrialization. As of end of 1999, 75,738ha of tidal land reclamation, 48.3%, out of 156,666ha has been carried out in Korea. In spite of continuous implementation of tidal land reclamation, 48.3%, out of 156,666ha has been carried out in Korea. In spite of continuous implementation of tidal land reclamation projects, the appraisal of the national land expansion value has not been made even though the severe competitiveness of land use in economic development. Agricultural land about 20,000 - 30,000ha per year has been converted to urban and industrial land and the converted areas have been produced higher added value than that of the farm land. Accordingly, farm land expansion equivalent to the converted area have to be reclaimed to cope with the food shortage and security in the future. In relation to the study, demand and supply of rice, the staple food of Korean, has been projected up to year 2025. The study results are as follows: 1. Under the assumption of continuing the present tendencies of rice consumption, population increase, farming practices and farm land conversion, paddy area requirement to meet self sufficiency of rice were forecasted as 136,950ha in 2015, 193,460ha in 2020 and 218,482ha in 2025 respectively. 2. The average converted price of paddy per pyeong in Kimje city, Puna Gun and Gunsan city was estimated at 241,150won and average farm land price was amounted to 63,760won. The differential rent was estimated at 177,400won per pyeong which was used as a criteria for valuation of national land expansion effect of the tidal land reclaimed by Saemangeum project. The total land rent of 23,250ha expanded by tidal land reclamation was amounted to 12,361 billion won. Annual expected value of the expanded national land was estimated at 988.9 billion won considering 8% of annual discount rate in Korea. 3. Tidal land resource for paddy area development is limited comparing with the future requirement of paddy area to cope with self sufficiency of rice consumption. Accordingly farm land conversion to urban and industrial land should be regulated and protected in the sense of sustainable development in the future.

• 농촌계획
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• 제8권1호
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• pp.3-14
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• 2002

Changes of chemical properties by times of the reclaimed tidal land soils and soil surface water, underground infiltration water with precipitation-runoff on natural meteological condition in the unripened tidal reclaimed paddy fields were investigated. This study was carried out to use environment-friendly farm land in the reclaimed tidal lands. The soils used in this study were saline-alkaline soils with the high $Na^+$ and $Mg^{++}$ content. As the results of investigation outflow loading of nutriments through outflow water in the unripened tidal reclaimed paddy fields by precipitation during the survey period, nutriments equivalent to T-N $1{\sim}2\;kg\;10a^{ -1}$ and T-P $0.01{\sim}0.02\;kg\;10a^{-1}$ from in the unripened tidal lands were discharged. Besides, the results of comparison losses of cation through outflow water showed $Na^+>\;K^+>\;Mg^{++}\;>\;Ca^{++}$, and the highest appeared water discharge of $Na^+$. In case of saemangeum reclaimed tidal land soils water discharge of cations showed $Ca^{++}$ 1.3 kg $10a^{-1}$, $Mg^{++}$ 1.6 kg $10a^{-1}$, $Na^+$ 17.7 kg $10a^{-1}$, and $K^+$ 3.2 kg $10a^{-1}$ respectively. On the other hand, in case of koheung reclaimed tidal lands soils water discharge of cations showed $Ca^{++}$ 18.1 kg $10a^{-1}$, $Mg^{++}$ 31.2 kg $10a^{-1}$, $Na^+$ 320.8 kg $10a^{-1}$ and $K^+$ 51.2 kg $10a^{-1}$ respectively.

• 드라이브 ㆍ 컨트롤
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• 제17권4호
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• pp.133-140
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• 2020

Traction performance of a tractor varies depending on soil conditions. Sinkage and slip of the driving wheel for tractor frequently occur in a reclaimed land. The objective of this study was to develop a tractor suitable for a reclaimed land. Traction performance was evaluated according to soil conditions of reclaimed land and paddy field. Field experiments were conducted at two test sites (Fields A: paddy field; and Field B: reclaimed land). The tractor load measurement system was composed of an axle rotation speed sensor, a torque meter, a six-component load cell, GPS, and a DAQ (Data Acquisition System). Soil properties including soil texture, water content, cone index, and electrical conductivity (EC) were measured. Referring to previous researches, the tractor traveling speed was set to B3 (7.05 km/h), which was frequently used in ridge plow tillage. Soil moisture contents were 33.2% and 48.6% in fields A and B, respectively. Cone index was 2.1 times higher in field A than in field B. When working in the reclaimed land, slip ratios were about 10.5% and 33.1% for fields A and B, respectively. The engine load was used almost 100% of all tractors under the two field conditions. Traction powers were 31.9 kW and 24.2 kW for fields A and B, respectively. Tractive efficiencies were 83.3% and 54.4% for fields A and B, respectively. As soil moisture increased by 16.4%, the tractive efficiency was lowered by about 28.9%. Traction performance of tractor was significantly different according to soil conditions of fields A and B. Therefore, it is necessary to improve the traction performance of tractor for smooth operations in all soil conditions including a reclaimed land by reflecting data of this study.

• 한국토양비료학회지
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• 제40권2호
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• pp.109-113
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• 2007

계화간척지의 간척지구별 숙답화에 따른 토양특성을 구명하여 시비 및 토양관리계획을 수립하고자 논토양 100필지의 토양특성과 177농가에 대한 영농설문을 조사 분석한 결과 유효토심은 17.8 cm로 적정값(50 cm 이상)에 비하여 크게 미달되었으며 특히 심토의 경우 토양경도 $12.40kg\;cm^{-2}$, 용적밀도 $1.59g\;cm^{-3}$ 로 매우 높아 토양의 물리성이 불량하였다. 토양의 염농도는 0.03~0.12%로 거의 제염이 되었으며, 작토의 pH는 6.0, 유기물함량은 $8.6g\;kg^{-1}$, 유효 인산 및 규산은 각각 58과 $85mg\;kg^{-1}$, CEC는 $7.4cmol\;kg^{-1}$, ESP는 10.3%로 나타나 토양 중 양분의 불균형 현상이 나타났다. 또한 계화간척지 논에서 벼재배시 농가의 시비량($N-P_2O_5-K_2O$, kg $ha^{-1}$)은 200-54-61이었으며 경운시기는 84%가 춘경을 하였으며 벼 재배 시 볏짚을 매년 시용하는 농가는 14%에 불과하였다.