Abstract
Large shallow lakes often show high concentration of suspended solids due to active sediment resuspension. Daily reflectance amounts obtained from MODIS Aqua from 2003 to 2017 were used to determine dominant processes governing the total suspended solid (TSS) concentration at the surface of Tonle Sap Lake. R squared and the root mean square error of the derived equation for TSS estimation were 0.92 and 14.1 mg/L, respectively. The relation between TSS concentration and water depth in the inflow period fluctuated annually with the amount of inflow from the Mekong River. Surface/subsurface flow from floodplain forests with relatively low TSS concentration diluted the TSS concentration along the shore of the lake during the dry seasons. In addition, a lower water level during flood periods resulted in the higher TSS concentration during the subsequent dry periods. Climate change and water resource development are likely to reduce the water level in the Mekong River during flood periods from July to September; thus, they may increase the TSS concentration in the lake, particularly in March, when the water level is lowest.
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Hoshikawa, K. et al. (2022). Total Suspended Solid Dynamics Revealed by Long-Term Satellite Image Analysis. In: Yoshimura, C., Khanal, R., Sovannara, U. (eds) Water and Life in Tonle Sap Lake. Springer, Singapore. https://doi.org/10.1007/978-981-16-6632-2_18
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