창원시 도시하천 하구역의 지형 특징과 생태환경 = Geomorphological Characteristics and Ecological Environments of Urban Stream Estuaries in Changwon City, Korea

다국어 초록 (Multilingual Abstract)

Namcheon, which flows through Changwon City, along with its tributaries Changwoncheon and Naedongcheon, exhibits unique topography and ecological characteristics as an urban stream system. The Namcheon estuary, an open estuary connected to Masan Bay, displays tidal river characteristics. Despite channel straightening, various sedimentary formations have developed within the streams, demonstrating features typically observed in natural stream. These characteristics are also evident in Changwoncheon and Naedongcheon, major tributaries of Namcheon. The riverbed exhibits complex and diverse sediment deposition, including gravel, sand, and silt, enhancing topographic diversity of riverbed. The formation of various-scaled sand-gravel bars and sand-gravel bar terraces, coupled with wetland vegetation, provides habitat for fauna. Notably, in the upper reaches of the tidal sections, the development of braided and anastomasing channels increases geodiversity in these otherwise monotonous urban streams, creating crucial habitats for fish and benthic organisms. However, concerns arise regarding heavy metal contamination, as lead and mercury were detected in the sediment. Additionally, the water quality exhibited a low oxidation-reduction potential (ORP), suggesting diminished self-purification capacity. The urban streams of Changwon City offer a relatively healthy ecological environment within an industrialized urban area characterized by limited habitats. As these streams present an opportunity to assess the ecological functions and roles of urban estuaries, they warrant increased attention and research.