Sediment resuspension and light attenuation in Peoria Lake: can macrophytes improve water quality in this shallow system?

被引:71
作者
James, WF [1 ]
Best, EP
Barko, JW
机构
[1] USA, Engineer Res & Dev Ctr, Eau Galle Aquat Ecol Lab, Spring Valley, WI 54767 USA
[2] USA, Engineer Res & Dev Ctr, Environm Lab, Vicksburg, MS 39180 USA
关键词
light attenuation; macrophytes; resuspension; shear stress;
D O I
10.1023/B:HYDR.0000027328.00153.b2
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
We examined sediment resuspension and light attenuation in relation to the potential for macrophytes to improve water quality conditions in Peoria Lake, Illinois (U.S.A.). The lake exhibited high total suspended solids (TSS) loading and retention of predominantly fine-grained particles in 2000. Large fetches along prevailing wind rose, coupled with shallow morphometry and sediment particles composed of >90% silt and clay resulted in frequent periods of sediment resuspension. As calculated (wave theory) shear stress increased above the critical shear stress (measured experimentally), turbidity increased substantially at a resuspension monitoring station. Resuspension model explorations suggested that establishment of submersed aquatic macrophytes could substantially reduce sediment resuspension in Peoria Lake. However, K-d is currently very high, while Secchi transparency low, at inlake stations. Thus, in order to establish a persistent macrophyte population in the lake to control resuspension, the underwater light regime will have to improve quite dramatically.
引用
收藏
页码:193 / 201
页数:9
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