Estimation of Algal and Suspended Sedimen Loads (Singly and COmbined). Using Hyperspectral Sensors and Intergrated Mesocosm Experiments

摘要

Most remote sensing algorithms for materials in water are based on studies on natural waters with complex and variable otpical properties, or of small indoor microcosm containers. We used sunlit, cylindrical, black mesocosm tanks (80m~3, 3 m depth) and a hyperspectral radiometer toexamine relectances of algal blooms and suspended kaolin white clay. In three integrated experiments, algae and clay levels were carefully manipulated: (1) Algal bloom water in one tank was pumped to a second which began with clear water, and clear make-up water was pumped to the first to obtain a well graded series (ChI. a=0-62 mug/L). (2) White, kaolin clay was added stepwise to clear water, resulting in an organic seston range of 0-40 mg/L. (3) Algal bloom water from a single source was divided between two tanks to establish Chl. a loads of 31 and 57 mug/L. Then, identical additions of clay were made to both tanks to acieve a range of 0-72 mg/L inorganic matter while conserving the algal loads.