Also based on TM image, two reasons resulting in the spatial and temporal changes of water clarity are discussed: land use and kinning, which is useful to the governance of Qiantang River estuary.

• 基于TM影像，尝试着从土地利用和围垦的角度来探讨水体透明度这种时空变化的原因，从而为钱塘江的河口治理提供决策支持。