Suspended solids in Missouri reservoirs in relation to catchment features and internal processes |
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Authors: | Jones John R Knowlton Matthew F |
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Affiliation: | Department of Fisheries and Wildlife Sciences, University of Missouri, Columbia, MO 65211-7240, USA. jonesj@missouri.edu |
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Abstract: | Mean total suspended solids (TSS), in 135 Missouri reservoirs range from 1.2 to 47 mg/l. The volatile (VSS) and non-volatile (NVSS) fractions range from 0.6 to 9.6 mg/l and 0.5 to 37 mg/l, respectively. %NVSS is the larger fraction and declines through summer as %VSS increases. Suspended solids (particularly VSS) correlate with metrics of lake trophic state and are positively related with the proportion of cropland (%C, r = 0.69-0.74) in their catchments, negatively related with forest cover (r = -0.54 to -0.56), and weakly related with grassland (r < 0.31). Regressions including %C with dam height (representing morphometry) and flushing rate (representing hydrology), explain approximately 70% of cross-system variation in TSS and 67% in VSS. Dam height and %C explain 57% of variation in NVSS. Residual analysis shows statewide models under-predict suspended solids in urban reservoirs. Effects of catchment features on summer TSS largely reflect internal plankton growth mediated by influent nutrients (affecting VSS) over direct sediment input (affecting NVSS). |
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Keywords: | Suspended solids Land cover Reservoirs Nutrients Chlorophyll Seston |
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