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2017 Vol.22, Issue 1

Article

Characteristics of Nutrient Distribution by the Natural and Artificial Controlling Factors in Small Stream Estuary

소하천 하구(남해 당항포)에서 자연적, 인위적 요인이 영양염 분포에 미치는 영향

SUNGCHAN KANG1
,
SOHYUN PARK1
,
SOONMO AN1*
강 성찬1
,
박 소현1
,
안 순모1*
1Department of Oceanography, Pusan National University
1부산대학교 해양학과
* Corresponding Author
February 2017. pp. 1-17
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Abstract

본 연구는 소하천 하구의 영양염 분포를 조절하는 요인에 대해 알아보기 위하여 수행되었다. 남해안 당항포에 위치한 세 하천(닫힌 하구: 고성천, 열린 하구: 구만천, 마암천)에서 2010-12년까지 계절별로 영양염(질산염, 암모늄, 인산염) 농도를 측정하였다. 고성천의 댐은 담수의 희석을 막고 체류시간을 증가시켜 높은 영양염 농도의 원인이 되어 인위적인 요인이 소하천 하구의 영양염 분포에 중요함을 나타내었다. 그 외에 물리, 기후, 생지화학적 요인이 세 하천 영양염 분포에 영향을 주었다. 세 하천 모두에서 질산염은 상류에서 높고 하류로 갈수록 감소하였다. 이것은 상류 집수역에서 공급이 많고, 하류로 갈수록 희석 및 하구 내 생지화학적 과정에 의한 제거가 활발하기 때문으로 여겨진다. 특히 탈질소화 등 대표적인 생지화학적 질소영양염 제거과정은 상류에서 하류로 갈수록 감소하는 경향이 뚜렷하였다. 그러나 암모늄과 인산염은 하천에서 유입되는 농도가 높은 경우에만 상류에서 하류로 갈수록 농도가 낮아지는 경향이 뚜렷하게 나타났다. 영양염 농도의 계절 분포는 여름철에 낮고, 겨울철에 높은 경향을 보였다. 여름철 유량으로 인해 체류시간이 감소하였고, 희석 증가로 하천 내 영양염 농도를 감소시켰으며, 높은 수온으로 인한 생물 생산에 의한 영양염 제거 역시 낮은 영양염 농도에 영향을 주었다. 소하천 하구는 높은 질소제거율(-k) 을 가지는 등 대형하구와는 구별되는 영양염 거동을 보이며 향후 소하천 하구 관리를 위해서는 이러한 특성을 파악하는 것이 필수적이다.

This study was conducted to investigate the nutrient distribution and controlling factors in small stream estuaries. The seasonal variations of nutrient concentration (nitrate, ammonium and phosphate) were observed from 2010 to 2012 in the three streams located in Dang-hang (closed estuary: Go-seong, open estuary: Gu-man and Ma-am). The nutrient concentrations in Go-seong were significantly higher than other estuaries, because Go-seong is relatively large and has large nutrient load from the watershed. The dyke located at the estuary, also, caused the high nutrient concentration by reducing the dilution and increasing residence time. In all three streams, nitrate concentration was high at upstream and decreased toward the downstream, because high load of nutrient input were located at upstream. Dilution and biogeochemical removal toward the downstream also caused the trends. Especially, denitrification, a typical nitrogen removing process showed clear tendency of gradual decreasing from upstream to downstream. However, Ammonium and phosphate concentrations were high at upstream and decreased toward the downstream only when the nutrient loads from the rivers were high. Nutrient concentrations were low in summer and high in winter. Freshwater discharge in summer caused a decrease of the residence time and increase of the transport of nutrients to downstream and reduced the nutrient concentrations in the estuary. Nutrient removal by the biological production during high temperature periods also affected the low nutrient concentrations. Small stream estuaries showed distinct nutrient dynamics. It is necessary to understand these characteristics in order to properly manage the small stream estuary.

Keywords
Small stream estuary
Nutrient distribution
Denitrification

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Information
  • Publisher :The Korean Society of Oceanography
  • Publisher(Ko) :한국해양학회
  • Journal Title :The Sea Journal of the Korean Society of Oceanography
  • Journal Title(Ko) :한국해양학회지 바다
  • Volume : 22
  • No :1
  • Pages :1-17
  • Received Date : 2016-07-26
  • Revised Date : 2017-01-23
  • Accepted Date : 2017-01-31
  • DOI :https://doi.org/10.7850/jkso.2017.22.1.001
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