This study analyzed the impact of river maintenance on the aquatic ecosystem health of the Gumi Stream. Evaluation of the Habitat and Riparian Index (HRI) showed a decline from grade C before maintenance to grade D after, because of channelization and levee construction that disturbed the floodplain ecosystems and reduced habitat and species diversity. An appropriate range of the channel-to-floodplain (levee-to-levee) width ratio (w) was proposed: 0.20<w<0.30 for reaches with a levee-to-levee width less than 50 m, 0.30<w<0.40 for widths of 50~100 m, and 0.40<w<0.50 for widths greater than 100 m. These ranges can prevent excessive channel expansion while avoiding floodplain overextension that promotes artificial land use, thereby mitigating the degradation of river ecosystem health. Surface cover analysis within the floodplain indicated that impervious surface area increased from 10% to 17% and semi-pervious area from 2.6% to 12.9% following river maintenance, revealing substantial alterations in riparian space. Future research should verify the correlation between the w value and ecosystem health across different river types and establish threshold values applicable to river maintenance design. Furthermore, management strategies that minimize impervious surfaces and secure pervious materials or green riparian spaces can preserve the ecological buffering capacity of rivers, contributing to the maintenance and restoration of aquatic ecosystem health.

Abstract
서 론
재료 및 방 법
    1. 연구 대상지 개요
    2. 구미천의 토지이용 분석 및 서식 및 수변환경 평가
결과 및 고 찰
    1. 하천정비에 의한 수로폭과 수변공간 변화
    2. 구미천 제외지 토지이용 분석 결과
    3. 구미천 하천정비 전·후의 서식 및 수변공간 변화
적 요
REFERENCES

• 문효정(금오공과대학교 환경공학과) | Hyo-jeong Moon (Department of Environmental Engineering, Kumoh National Institute of Technology, Gumi 39177, Republic of Korea)
• 박제철(금오공과대학교 환경공학과) | Je-chul Park (Department of Environmental Engineering, Kumoh National Institute of Technology, Gumi 39177, Republic of Korea) Corresponding author