PROJECT TITLE :

Using Remote Sensing to Track Variation in Phosphorus and Its Interaction With Chlorophyll-a and Suspended Sediment

ABSTRACT:

Treatment of eutrophication and algal blooms in giant shallow lakes has been constrained by the endogenetic unleash of nutrients from sediment resuspension despite the wellcontrolled input of nutrients from surrounding land in Taihu Lake, China. During this study, we tend to propose a technique to simplify regionally empirical algorithms for total suspended matter (CTSM), chlorophyll-a (CChl-a), and phosphorus concentration (Cp) for the Geostationary Ocean Color Imager (GOCI) for Taihu Lake. The results show that the GOCI-derived CTSM, CChl-a, and Cp match well with the in situ measured knowledge. Based on the validated synchronous and timely observation information (CTSM, CChl-a and Cp) from GOCI level-1b information, the interaction of phosphorus with algae and suspended sediment were analyzed from August six to August nine, 2013. The results indicate that phosphorus released from sediment resuspension is significant in Taihu Lake, with a high spatial-temporal variation. The effect of the restriction of nutrients (nitrogen and phosphorus) on algal growth varied temporally and spatially with the hydrodynamic characteristics of the lake. In most cases, restricted phosphorus in the lake is the primary reason for the algal growth, especially in open regions such as Center Lake (CL), Northwestern Lake (NWL), and Southwestern Lake (SWL). Both nitrogen and phosphorus are the restrictive factors to algal growth in Meiliang and Gonghu Bays. More attention ought to therefore be centered on the endogenetic unharness of phosphorus in Taihu Lake when treating eutrophication and algal blooms in addition to controlling the input of nitrogen and phosphorus from surrounding land.