낙동강 하구역 해수유동 특성과 부유사 수송량 산정

Abstract

In this study as a basic study on the long-term prediction of topographical change which develop the marine disaster, the physical environment survey was carried out around Nakdong River mouth and Jinudo in order to study the tidal current characteristics and suspended solid flux of Nakdong River Estuary. Also, the deposition variations concerning SS (Suspended Solid) flux which generated at one station during neap and spring tidal period, were estimated. The results from this study as follows; SS net flux in open sea section of Nakdong River Estuary was estimated about 21.44 × 10² ton/day and 211.77 × 10² ton/day during normal and flood season respectively, so the quantity of flood season was higher 10 times than one of normal season. From the results for the vertical distribution of SS net fluxes, SSLH (latitudinal SS net flux) and SSLV (longitudinal SS net flux) during spring tidal period were estimated about ave. 28 kg/㎡/hr (eastward of Jinudo) and 11.1 kg/㎡/hr (northward of Jinudo), respectively. And during neap tidal period, SSLH and SSLV were about ave. 4.8 kg/㎡/hr (eastward) and 1.5 kg/㎡/hr (northward), respectively. The depth averaged values of the SSLH and SSLV during spring tidal period were approximately 6 times higher than those during neap tidal period. In conclusion, it was considered that topographical change of southern part of Jinudo was affected by resuspension of bottom sediments due to strong current on bottom layer during the flood tidal current period.