ESTIMATION METHOD AND CHANGE CHARACTERISTICS OF SEAWEED AMOUNT IN THROWN STONE REEF

Abstract

 Barren ground is widely distributed in the sea area. The growth of seaweed is effected by water temperature, wave height, solar radiation and other environmental factors. And feeding pressure of sea urchin is also important to predict seaweed growth. In this research, from field survey of thrown stone reef and breakwater structure that has reef steps, change characteristics of seaweed amount and sea urchin number are clarified. Seaweed amount of thrown stone reef are smaller than that of rear steps. By improving the prediction method in the rock reef area, estimation method of seaweed amount in thrown stone reef are developed.