Release characteristic of nutrient from sediment in the estuary driven by wind and wave

A Y-shape apparatus,which stimulates the resuspension-sedimentation process of indoor sediment,was deployed to study the resuspension and settlement process of sediments from the estuary of Tianji Port in Conghu Lake under the influence of different wind strengths.More suspended substance(SS)will be released into the water the increases of wind speed.The increment of ammonia nitrogen(NH₄⁺-N)is negative under the three types of wind.The gross of phosphate(PO₄^3--P) exhibits a decreasing trend under the condition of light to moderate wind.The gross of PO₄^3--P rises significantly under strong wind,about the increase of 46% compared to the initial value.The release and adsorption of PO₄^3--P are dynamically balanced under a simulated wind condition between 5.1 m/s and 8.7 m/s and an apparent value equals to the initial value.The gross of total nitrogen(TN)and total phosphorus(TP) Increases as the wind strength gets stronger.Compared to the initial value,the increase of TN and TP can be as much as approximately 2 and 17 times,respectively.The gross of TN and TP almost returns to the initial value after wind stops.For the typical type of wind,the vertical distribution of nutrient shows not clear patterns.