MUD SHORE BEACH NOURISHMENT TECHNOLOGY AND BENEFIT EVALUATION: CONSTRUCTION AND EVALUATION OF TIANJIN EAST BEACH

The Tianjin Tanggu Dongjiang harbour is located between the Haihe River estuary and the Yongding River estuary. It is a typical muddy coast with low tidal flat and stick and slip sediments. The sediment concentration of sea water is high and the wave is strong during the storm surge. Therefore, there was no engineering geological condition to building sand beaches. After construction of a semi-closed breakwater cofferdam which is 3.8 km long, and a sand-mud separator which consists of Bamboo raft-geotextile, an artificial beach, which is 1 370 m long and 140 m wide, was constructed in 2008. It has successfully provided conditions for swimming and summer holidays. Beach nourishment at muddy coast is an innovation by Chinese. So far, we have built tens of artificial beaches along the muddy coasts of China, among which, the artificial beaches at Shanghai Jinshan, Tianjin Dongjiang and Weifang Yangzi are the most successful ones. They have provided useful experiences in building cofferdam, separator, sector net and the facilities to precipitate mud and clean water.