• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.420-420
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• 2022

우리나라의 기후 변화(여름철 집중호우, 동절기 가뭄 등)로 인하여 과거에 비해 하천의 식생영향은 증가하는 추세이고, 하도 내 수중식생은 성장과 소멸을 반복하며 기존 수위-유량관계에 변동성을 유발하고 있다. 수중식생은 수위가 상승하는 경우(강우, 방류량 증가 등)에 일부 소멸하여 유량이 증가하고, 수위가 유지되거나 평균기온이 상승하는 경우에는 성장으로 인하여 유량이 감소하는 경향을 가지고 있다. 본 연구에서는 하도 내 수중식생의 성장과 소멸에 따른 수위-유량관계곡선식의 변화의 영향을 분석하기 위해 금호강 제1지류 자호천에 위치한 영천시(단포교)관측소를 대상으로 '18년~'21년까지의 수중식생의 성장과 소멸, 회귀하는 기간의 유량 측정 성과를 확보하고 수중식생 모니터링 자료를 수집하여, 식생영향에 따른 수위-유량관계 변화를 분석하였다. 영천시(단포교)관측소는 수중식생영향을 지속적으로 받고 있으며 단면 통제나 하도 통제가 아닌 식생통제를 고려하여 '18년~'20년까지는 식생 활착, 성장과 소멸이 진행되는 기간의 성과를 확보하였고, '21년은 저수위구간의 식생성장에서 소멸까지 점차 회귀하는 성과를 각 기간별로 확보하고 분석을 통해서 수위-유량관계 곡선식을 개발하였다. 수중식생의 성장에 따라 평균유속이 감소하며 곡선식은 (-)전이가 발생하였고, 수중식생의 소멸이 발생한 경우 평균유속이 증가하여 곡선식은 (+)전이가 발생하였다. 영천시(단포교)관측소는 이러한 모니터링 결과와 유량측정성과를 바탕으로 총 5개의 기간분리가 발생하였으며, 각 기간별 곡선식 불확도와 편차율 검토 결과 유량측정성과와 곡선식은 정밀도 높은 정확성을 갖고 있는 것으로 분석되었다. 결과적으로 본 연구에서는 하도 내 수중식생영향에 따른 유량측정성과를 확보하였으며 확보한 유량측정성과의 분석을 통한 신뢰도 높은 수위-유량관계곡선식을 개발하였고 이를 통해 생산된 유량자료는 정확도가 매우 높은 것으로 분석되었다.

• Journal of the Korean association of regional geographers
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• v.10 no.1
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• pp.83-95
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• 2004

Chilgok District is a historical area, which has had a certain amount of development. It has its own regional characteristics originating from its isolation from the existing built up area of Daegu City by the Kumho River This study explores the historical development processes and pending development issues of Chilgok District. In 1640 after the Japanese invasion of Korea in 1592, the district upgraded into Chilgok Dohobu due to its importance as a transportation hub of Youngnamdaero(the main road of Youngnam province in Chosun Dynasty). In its early stages, the government office was located in Kasan fortress, later the of office was moved to Eupnae-Dong. The Chilgok district has experienced a developmental lag resulting from the office's removal to Waegwan, located on the Kyungbu railroad since 1914. Later, due to the increasing influence of nearby Daegu City, urbanization continued gradually. Finally in 1981 Chilgok district was officially incorporated into Daegu Metropolitan City. In the later 1980s, the housing land development project was applied into the district centered on the alluvial plain of Palgeo-Cheon(stream) of the Northern part of Taejun-Bridge. Although the old built up zone was excluded from public sector development projects, private sector development has made the zone a modern town. Now, Chilgok district has transformed into a high-density residential new town in which high-rise apartment complexes mingle with numerous houses. As the district has developed, traffic jams have become a hot issue and it is going to get worse than now as the development continues. To solve this problem, Daegu city needs to swiftly construct the fourth belt way and the third subway line.

• Current Research on Agriculture and Life Sciences
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• v.15
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• pp.33-38
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• 1997

This investigation was attemped to know fruit quality of apple 'Fuji' grown at three different areas of Taegu. Fruits were gathered from hill side area : Kyungsangpookdo yongchongun chongtongmynn synwonri, flat area : Kyungsangpookdo yongchongun synyoungmyun youujeongri and river side area : Kyungsangpookdo yongchongun kewmhoyeub naenhchundong. Results were as follows: 1. In fruit sampling, we made an effort to select the same size of fruit from all areas, However, the size at river side area was about 40g lighter and minimum length was shorter than those of the other areas. On the other hand, maximum and minimum diameter of the fruit at flat and river side areas were longer than hill side area. Accordingly, shape index of the fruit in river side area was flatter than the other areas. This difference may be due to temperture, soil moisture content, etc. In squeeze rate of the fruit, no significant difference was recognized among areas. 2. Though, rate of fructose in total sugar was almost 50% in all areas, sucrose, fructose and sorbitol concentration of hill side area were higher than the other areas. however glucose was reverse amd brix was almost same as total sugar concentration. 3. Rate of malic acid in total acid was almost 98% and citric acid was only 2% in all areas. Malic acid concentration of hill side area was higher than the other areas and titratable acid concentration was almost same as total acid.

• Korean Journal of Ecology and Environment
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• v.34 no.3 s.95
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• pp.185-191
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• 2001

The morphological variation and density of the Euglena viridis cells and environmental factors of urban waterways of Daejoncheon , Jeonjucheon, Kwangjucheon, Kumhogang, Mihocheon,and Musimcheon, Korea were studied from 25December, 1995 to 5 January, 1997 in order toelucidate possible relationships among the bio-logical and abiological factors. All E. viridis cells were same in having single star-cluster of chlo-roplast lobes and included two morphotypes based on other detailed morphology. The morphotype I cells agreed well with the typical form off. viridrs and commonly occurred in most of waters and bloomed with $5386\;cells\;{\cdot}\;mL^{-1}$ in Kwangjucheon. The density of the morphotype Ipositively correlated with ammonium (r = 0.80)and nitrite (r = 0.68), while negatively with nit-rate concentration. The morphotype II cells were characterized by having randomly scattered cytoplasmic granules beneath pellicle and unevenmargined lobes of chloroplasts. The density of the morphotype II positively correlated with nitrate (r = 0.98), while negatively correlated with ammonium and nitrite. However, the density of each morphotype was not significantly related with inorganic phosphate, temperature and pH of surface water. These results indicate that E. viridis includes two morphotypes in urban waterways in Korea, that coexist in the same period and station as a response of allocation of nitrogenous nutrients.

• Journal of Korean Society of Forest Science
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• v.95 no.3
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• pp.256-260
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• 2006

This study was conducted to investigate the effect of parasititoids on the density-fluctuation of the pine needle gall midge, Thecodiplosis japonensis. The density of T. japonensis and its parasitoids was observed by emergence trap in pine forest in Namsung-dong, Keumho-eup, Youngcheon-shi, Kyeongsangbuk-do, Korea, from 1986 to 2005. After 1987, density fluctuations of adults pine needle gall midge and its parasitoids showed similar trends and density of parasitoids was dependent on density of host population. Sex ratio of the pine needle gall midge, T. japonensis, was female-biased and had some variations in according to years. These trends were similar to those of parasitoid populations and sex ratio of Inostemma seoulis was more female-biased than that of I. matsutama. T. japonensis adults emerged in the field from May 16 to July 27 and the peak of emergence was between late May and early June. The adults of Inostemma matsutama emerged from May 16 to June 11 (peak between late May and early June), whereas those of Inostemma seoulis emerged from June 9 to July 27 (peak: late June).

• Journal of the Korean association of regional geographers
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• v.8 no.3
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• pp.295-313
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• 2002

While the growth of Taegu has occurred through the land readjustment project, the public sector development project and the construction of roads, its growth pattern has been shaped by physical constraints such as mountains, streams and rail roads. The processes of urban growth of Taegu are classified into four stages: the stage of urban embryo in the Chosun Era; the formation stage of the basic urban system after the Japanese Colonial Era up to 1960; the stage of urban growth in the industrialization period from 1960s to 1980; and lastly, the stage of urban expansion and maturation, with construction of extensive newly developed districts, after the 1980s. Since its promotion to a metropolitan city with the inclusion of Seongseo, Wolbae, Gosan, Ansim and Chilgok in 1981, those regions have grown into newly developed residential districts, with its accompanying high density and high rise apartments complexes, through the public sector development project. These newly developed districts are located about six to seven kilometers away from CBD of the city along with main radial roads. The sites are also located on the route of the fourth belt way of the city. While the Sangin, Seongseo and Jisan Beommul newly developed districts have developed contiguously with the existing built-up areas, the Siji and Chilgok districts have developed separately by the green belt and the Geumho River, respectively.