DIỄN BIẾN NGƯỠNG CÁT DI ĐỘNG TẠI CỬA ĐẠI & CỬA LỞ TỈNH QUẢNG NGÃI QUA ẢNH VỆ TINH

Abstract

This paper presents the results of application of GIS technology and remote sensing images from 2012 to 2017 to illustrate the evolution of the sandbar of Cua Dai (Tra Khuc and Lo rivers) in Quang Ngai province. The results have made clear the evolution of Dai and Lo estuaries in Quang Ngai province through interpretation and analysis of satellite images, based on the trend of Dai and Lo estuaries evolution. It was estimated the roles of hydrodynamics processes such as river flow, coastal currents and waves to the formations of Dai and Lo estuaries. The results show that the main developments follow the rule of narrowing the estuaries in the dry season and opening in the rainy season with the main role of this time as the flood flow. Flood season here often accompanied by the typhoon landing in September 9-10 with heavy rain caused floods due to storm circulation causing the flow down to the flood to the estuaries.