Memory Soundscape: pick a memory

I want to pick the experience of my first trip with my friends at university to Jiaxing, Zhejiang province. To be more specific, is the memory of watching the Qiantang River Tide in Haining. In Haining, we wandered along the bank of Qiantang River and waited for the tidewater that come from the East China Sea to the Qiantang River in the Bay of Hangzhou. 

At the beginning, the air was quiet because the water water level is low, and the river bottom is almost exposed. The only sound was created by us, the only four visiters in the park, stpping on the stone ground. Then we hear some thander-like sounds coming from away, and gradually reaching us. It was the sound of sea water rushing into the river, and it gets louder and louder with the tide approching us.