Using water quality variables to predict light attenuation coefficient: case study in Shihmen Reservoir |
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Authors: | Wen-Cheng Liu Ray-Shyan Wu Edward Ming-Yang Wu Yu-Pei Chang Wei-Bo Chen |
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Institution: | (1) Department of Civil and Disaster Prevention Engineering, National United University, Miao-Li, 36003, Taiwan;(2) Department of Civil Engineering, National Central University, Jung-Li, 320, Taiwan;(3) Department of Civil and Ecological Engineering, I-Shou University, Kaohsiung County, 840, Taiwan;(4) National Science and Technology Center for Disaster Reduction, Sindian City, 23143, Taipei County, Taiwan;(5) Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, 10617, Taiwan |
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Abstract: | The amount of photosynthetically active radiation (PAR) in the water column is of fundamental importance in determining the
growth of aquatic plant and aquatic primary production. Light attenuation in aquatic ecosystems has important ecological implication
and water quality applications. In the present study, the light attenuation through the water column in the Shihmen Reservoir,
Taiwan was measured. A light attenuation coefficient (K
e) can be derived from the PAR measurements at each stations. The linear regression analysis reveals that Secchi disk depth
is a sample alternative measure of light transmitability and provides a reasonable estimate of the light attenuation coefficient
in the Shihmen Reservoir. We conducted multiple-regression analysis for the K
e, chlorophyll a, and total suspended solids (TSS). Because the concentration of chlorophyll a is roughly <5 μg/L in the Shihmen Reservoir, the chlorophyll contribution to the attenuation coefficient will be <0.1 m−1, which is negligible. K
e correlated with TSS concentration yields a good correlation, indicating the TSS should be a good water quality variable for
predicting water column light attenuation coefficient in the Shihmen Reservoir. |
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