| Title |
Land Use Characteristics in the Kyungan Watershed by Analyzing Long-Term Land Cover Data |
| Authors |
한미덕 ( Mi Deok Han ) ; 김지찬 ( Ji Chan Kim ) ; 정욱진 ( Wook Jin Chung ) |
| Keywords |
Geographic Information System (GIS); Kyungan watershed; LULC change; TMDL management system; Water quality |
| Abstract |
The use of land cover was sharply changed during 1975~2007 in the Kyungan watershed (561.12 km2). The changes occurred over an area of more than 227.65 km2 during the overall period at changing rates of 1.04% per year for water area, 1.79% per year for residential area, 2.99% per year for bare area, 3.03% per year for wetland area, 3.04% per year for grass area, 0.87% per year for forest and 2.32% per year for agriculture area. Water, residential, bare and wetland areas increased, while grass, forest and agriculture areas decreased during the last 32 years. BOD concentrations of representative sites for each sub-watershed continuously increased until the early 2000s as residential area increased with the highest discharged load, but decreased after the mid 2000s except upper Kyungan watershed. Such decline appears to be associated with the planning of Total Maximum Daily Load management for Gwangju city and expansion of waste water treatment plant. It is necessary to control land use/cover changes of the upper watershed and to prepare appropriate watershed management system for improvement in river environment including water quality, stream flow and bio-diversity. |