Effect of fine sediment deposition and channel works on periphyton biomass in the Makomanai River, northern Japan Export

@article{citeulike:1861364, abstract = {The Makomanai River in northern Japan has suffered considerable fine sediment deposition, especially in a reach where channel works have been constructed. Four contiguous reaches were examined for deposition of fine sediment and the effects of such on periphyton biomass; two of the reaches had channel works and bank protection, respectively, the other two being unmodified. The influence of fine sedimentation on epilithic periphyton biomass (chlorophyll a weight and organic matter weight) and the autotrophic index (AI), and the relationship between these and hydraulic variables was emphasized. Fine sediment increased, chlorophyll a decreased and AI increased in the reach with channel works and in the unmodified reach immediately upstream. In addition, the current velocity and Froude number tended to decrease in the reach with channel works. Correlation analysis showed that with an increase in fine sediment, chlorophyll a decreased and non-living periphyton, indicated by AI, increased. It was also confirmed that fine sediment increased with an increase in weight of periphyton organic matter and decreased with an increase in current velocity or Froude number. These results suggest that accumulation of fine sediment, which substantially reduces light penetration for photosynthesis under low current velocity conditions, results in lowered periphyton levels. The channel works have lowered the current velocity, thus promoting deposition of fine sediment and an increase in non-living periphyton. Copyright {\copyright} 2002 John Wiley \& Sons, Ltd.}, address = {Department of Forest Science, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan}, author = {Yamada, H. and Nakamura, F.}, citeulike-article-id = {1861364}, citeulike-linkout-0 = {http://dx.doi.org/10.1002/rra.688}, citeulike-linkout-1 = {http://www.scopus.com/record/display.url?view=extended&origin=resultslist&eid=2-s2.0-0036736961}, doi = {10.1002/rra.688}, journal = {River Res. Appl.}, keywords = {bioaccumulation, japan, lib\_ecohydrology, lib\_freshwater, river, sediment}, number = {5}, pages = {481--493}, posted-at = {2007-11-05 15:02:56}, priority = {2}, title = {Effect of fine sediment deposition and channel works on periphyton biomass in the Makomanai River, northern Japan}, url = {http://dx.doi.org/10.1002/rra.688}, volume = {18}, year = {2002} }

TY - JOUR ID - citeulike:1861364 L3 - citeulike-article-id:1861364 N2 - The Makomanai River in northern Japan has suffered considerable fine sediment deposition, especially in a reach where channel works have been constructed. Four contiguous reaches were examined for deposition of fine sediment and the effects of such on periphyton biomass; two of the reaches had channel works and bank protection, respectively, the other two being unmodified. The influence of fine sedimentation on epilithic periphyton biomass (chlorophyll a weight and organic matter weight) and the autotrophic index (AI), and the relationship between these and hydraulic variables was emphasized. Fine sediment increased, chlorophyll a decreased and AI increased in the reach with channel works and in the unmodified reach immediately upstream. In addition, the current velocity and Froude number tended to decrease in the reach with channel works. Correlation analysis showed that with an increase in fine sediment, chlorophyll a decreased and non-living periphyton, indicated by AI, increased. It was also confirmed that fine sediment increased with an increase in weight of periphyton organic matter and decreased with an increase in current velocity or Froude number. These results suggest that accumulation of fine sediment, which substantially reduces light penetration for photosynthesis under low current velocity conditions, results in lowered periphyton levels. The channel works have lowered the current velocity, thus promoting deposition of fine sediment and an increase in non-living periphyton. Copyright © 2002 John Wiley & Sons, Ltd. IS - 5 JF - River Res. Appl. AD - Department of Forest Science, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan EP - 493 TI - Effect of fine sediment deposition and channel works on periphyton biomass in the Makomanai River, northern Japan VL - 18 SP - 481 KW - bioaccumulation KW - japan KW - lib_ecohydrology KW - lib_freshwater KW - river KW - sediment AU - Yamada, H AU - Nakamura, F PY - 2002/// UR - http://dx.doi.org/10.1002/rra.688 ER -