• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.282-282
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• 2021

강우시 농경지와 축산시설로부터 유출되는 비점오염물질은 하류 수계의 수질과 수생태계에 악영향을 미친다. 이에 따라 환경부에서는 비점오염원관리지역을 지정하고 다양한 비점오염 저감 대책을 시행하고 있다. 본 연구에서는 비점오염원관리지역으로 지정된 안동댐 하류 중 송야천 유역을 대상으로 강우유출수 모니터링을 수행하였으며, 모니터링 결과를 바탕으로 강우시 비점오염물질 유출 특성을 분석하였다. 모니터링 기간은 2020년 6월부터 11월까지 총 5회의 강우사상에 대하여 상·하류와 유입하천을 포함한 총 8개의 모니터링 지점을 대상으로 강우사상별 유량가중평균농도(Event Mean Concentration, EMC), 오염부하, 단위면적당 오염부하를 산정하였으며, 오염원 그룹별 비점배출부하를 산정하여 오염 기여도를 분석하였다. 강우유출수 조사결과를 이용한 EMC 농도 산정 결과 유입하천인 오산천 지점이 SS와 TOC 항목을 제외한 모든 수질항목의 EMC 농도가 가장 큰 것으로 나타났다. 단위면적당 오염부하를 산정하여 비교 분석한 결과 T-P 항목의 단위면적당 오염부하는 물한천 지점(0.69 kg/ha)과 오산천 지점(0.69 kg/ha)이 크게 나타났다. 결과와 같이 오산천 지점과 물한천 지점이 오염정도가 큰 것으로 나타났으며, 이에 따른 상류 오염원 현장 정밀조사를 수행하였다. 조사 결과 강우발생시 상류에 위치한 농경지와 축사에서 발생하는 오염원이 하천으로 유입되고 있었으며, 여러 축사에서 배출되고 있는 유입수를 채취하여 분석한 결과 T-P 농도가 평균 0.935 mg/L로 높게 나타났다. 전국오염원조사자료(국립환경과학원, 2017) 내용을 참조하여 송야천 유역의 오염원 그룹별 비점배출부하를 산정해 오염 기여도를 분석한 결과, T-P 항목의 경우 축산계와 토지계의 비점배출부하가 전체 비점배출부하의 약 63%와 37%를 차지해 비점배출부하 기여도가 큰 것으로 나타났다. 이와 같이 송야천 유역의 경우 강우시 농경지와 축산시설에서 배출되는 오염물질이 하천 수질오염에 상당한 기여를 하고 있는 것으로 보여지며, 비점오염원 발생에 대한 대책 마련이 필요할 것으로 사료된다. 본 연구 결과는 송야천 유역의 비점오염 저감 대책 수립을 위한 기초자료로 활용할 수 있을 것으로 판단된다.

• Journal of the Korean Association of Geographic Information Studies
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• v.17 no.3
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• pp.175-194
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• 2014

This study attempts to identify the spatial distributions of Achnanthes convergens, and elucidate the environmental factors that affect the Periphyton diatom habitat. Data in 250 points of Nakdong river basin are collected between April(primary) and September(secondary) 2012, with the National Institute of Environmental Research's support. We define "clean area" over 10% of Achnanthes convergens appearance, and the others as "non-clean areas". Spatial statistics of Kriging, Hotspot, LISA are used in this study. Results show that 1) 56 points are identified as clean areas in the primary survey, while 41 points are discovered in the following survey; 2) using water quality variables, density of turbidity(clean $101.83{\mu}s/cm$; non-clean $598.48{\mu}s/cm$) and conductivity(clean 1.95 NTU; nonclear 5.58 NTU) are five-fold lower in clean-areas; 3) Habitat and Riparian Factors in Nakdong basin illustrate that natural sand bar, diversity of velocity, sediment condition, levee material, riverside land affect Achnanthes convergens; 4) Hotspots of Achnanthes convergens are located in watersheds, including upper Andong Dam, upper Imha dam, Wi-cheon, Miryang river, Nam river and Hwang river whereas mainstream/downstream of Nakdong river and Keumho river watershed are shown as coldspots.

• Korean Journal of Ecology and Environment
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• v.39 no.2 s.116
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• pp.271-283
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• 2006

A systematic water quality survey was conducted in August, 2005 for a drinking water supply reservoir (the Jeolgol reseuoir located in an island), which is at an early stage of impoundment, to investigate the causes of water color deterioration of the reservoir and the clogging of filter beds of a water treatment plant. The reservoir shape was simple and its average depth was 5.5 m, increasing from upreservoir toward the downreservoir end near the dam. Dissolved oxygen (DO) and chloropllyll-a (chi-a) showed a large variation while water temperature had a smaller range. Transparency ranged from 0.6 to 0.9 m (average 0.7 m). The average value of turbidity was 9.3 NTU, ranging from 8.0 ${\sim}$ 12.1 NTU. The transparency and the turbidity appear to be affected by a combination of biological and non-biological factors. The poor transparency was explained by an increase of inorganic colloids and algal bloom in the reservoir. The blockage of the filter bed was attributed to the oversupply of phytoplanktons from the reservoir. The range and the average concentration of chi-a within the reservoir were 31.6 ${\sim}$ 258.9 ${\mu}g\;L^{-1}$, 123.6 ${\mu}g\;L^{-1}$ for the upper layer, and 17.0 ${\sim}$ 37.4 ${\mu}g\;L^{-1}$, 26.5 ${\mu}g\;L^{-1}$ for the bottom layer, respectively. A predominant species contributing the algal bloom was Dinophyceae, Peridinium bipes f. occultatum. The distribution of Peridinium spp. was correlated with chi-a concentrations. The standing crop of phytoplankton was highest in the upreservoir with $8.5\;{\times}\;103\;cells\;mL^{-1}$ and it decreased toward the downresevoir. Synedra of Bacillariophyceae and Microcystis aeruginosa of Cyanophyceae appeared to contribute to the algal bloom, although they are not dominated. It is mostly likely that sloped farmlands located in the watershed of the reservoir caused water quality problems because they may contain a significant amount of the nutrients originated from fertilizers. In addition, the aerators installed in the reservoir and a shortage of the inflowing water may be related to the poor water quality. A long-term monitoring and an integrated management plan for the water quality of the watersheds and the reservoir may be required to improve the water quality of the reservoir.

• Journal of agricultural medicine and community health
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• v.18 no.2
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• pp.131-140
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• 1993

This study was conducted to examine the levels of mercury in tissue of Carassius carassius collected at five areas(Andong, Sangju, Waekwan, Gangjung and Gaejin) in Nakdong river from February to March, 1993. The contents of total and organic mercury were determined by methods of Gold amalgam and Selective atomic absorption with mercury analyzer(Model SP-3A). The total mercury contents in muscle were $0.148{\pm}0.0646$ ppm by the Gold amalgam, and $0.113{\pm}0.0345$ ppm by the Selective atomic absorption, but in all parts of Carassius carassius were $0.342{\pm}0.4235$ ppm and $0.240{\pm}0.2974$ ppm respectively. These two methods were extremely high correlated(r=0.9812, p<0.001). The mean value of total and organic mercury by the two methods was high in the order of bone>fin>muscle, respectively, and the proportion of organic mercury to the total was 69.0%. Mean value of total and organic mercury in the muscle was the highest at Wakeman located in middle basin of Nakdong river, and in the bone and fin was the highest at Andong dam located in upper basin. According to sizes and parts of fish, the concentration of mercury was the highest in the muscle of 15-19 cm group, the highest in the bone of 10-14 cm group and in the fin of 20-24 cm group.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.36 no.3
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• pp.37-47
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• 2018

This study was attempted to understand present status and characteristics of landscape components of the domestic Korean Gugokwonlim created by the classical scholars in the Joseon Dynasty. The results are as follows. First, Distribution of Gukokwonlim in Korea shows that 55(51.4%) are located in Daegu and Gyeongsangbuk-do, and 22(20.56%) are located in Chungcheongbuk-do. Concentrated locations of Gugok are on the part of Baekdudaegan, from Sobaeksan mountain to Sokrisan mountain via Wolaksan mountain, and the Nakdong River basin of the Nakdong vein in the right bank. This consideration seems to be closely related to the academy of Yeongnam Confucianism and the their trend of Wonrim enjoyment. Second, according to the result of examining the distribution of Gugok according to the basic local government authority, The biggest number of the Gugok places(10 places, 9.35%) are located in Andong, which is called 'the capital of Korean spiritual culture.' Additionally in order, 9 places(9.45%) is located in Goesan, 8 places(7.48%) in Mungyung, 6 places(5.61%) in Bonghwa, and 5 places(4.67%) in Yeongju. Third, in order to the creating time of Gugokwonlim, 33 (33.0%) were created in $18^{th}$ century, and other 33 (33.0%) were created in $19^{th}$ century. In addition, 14 were created during $20^{th}$ century, while 13 were created in $17^{th}$ century. And 4 were created in $16^{th}$ century. Respectively. great number of $18^{th}$ and $19^{th}$ centuries shows that many(66.0%) Gugokwonrim were created between late 18th to 19th centuries. Fourth, There were 97(90.65%) of 'Gugok' in the form of collecting type, and a total number of bottom-up style Gugok were 99(92.5%) while top-down style Gugok were 8(7.5%). Fifth, Among the contents of Gugok, 67 were found in pome of Gugok(64.49%), 29 caved letters in rock(27.10%), and 16 in painting of Gugok(14.95%). Sixth, The most emerged landscape components of Gugok was Dae(臺) 124(13.05%), followed by Am(巖) 115[11.2%, including of Am(岩)] 115(11.2%), and Dam(潭) 73(7.68%), Jeong(亭) 48(5.05%), Dong(洞) 39(4.10%), San(山) 36(3.78%), Am(岩, rocks) 31(3.26 %), Bong(峯, peaks) 27(2.84%), Yeon(淵) 23(2.42%) and Chun(川) and Tan(灘) 22(2.31%). Mostly, common landscape components of Gugok are entrusted natural things. It is expected that more studies about the analysis of characteristics of Gugok's positioning types considering total distance and a gradient are required to understand more clearly characteristics and location distribution of true Gugok and its landscape components.