Behavior of storm-induced suspension interflow in subtropical Feitsui Reservoir, Taiwan

Chen, Yi Jen; Wu, Shang-Chuen; Lee, Bing-Shiou; Hung, Chang-Che

doi:10.4319/lo.2006.51.2.1125

Cited by 32 publications

(10 citation statements)

References 20 publications

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“…The density difference between inflow and ambient water may arise from both temperature differences and variations in solute concentrations (Chen et al, 2006;Chung et al, 2009;An et al, 2012;An and Julien, 2014), and the inflow can be a tributary from an upstream river, transferred water from another reservoir or contaminant spill from a location (Gu and Chung, 2003;de Cesare et al, 2006;Umeda et al, 2006). An overflow (Fig.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal stratification on interflow travel time in stratified reservoir

Zhang

Shi

et al. 2015

J. Zhejiang Univ. Sci. A

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This study is focused on the impact of thermal stratification on interflow travel time. A quantitative relation between buoyancy frequency and interflow travel time is theoretically derived based on the Bernoulli principle of energy conservation. Experiments and numerical simulations are carried out to validate the applicability of the proposed relation. For experiments, interflow movement is successfully detected in a small-depth water tank by releasing a denser flow into a temperature stratification environment. For numerical simulations, a vertical 2D renormalization group (RNG) k- model is developed to simulate the interflow. The results both of the experiments and of the numerical simulations verify our proposed theory. The derived analytic relation is useful for the prediction of contaminant travel time in reservoirs and in assisting pollution control.

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Section: Introductionmentioning

confidence: 99%

Effect of thermal stratification on interflow travel time in stratified reservoir

Zhang

Shi

et al. 2015

J. Zhejiang Univ. Sci. A

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“…A sequence of processes involving phosphate is expected to occur at the site. Bound phosphate would be released as dissolved phosphate in a reducing environment and transported upward to the euphotic zone (Robarts et al 1998;Chen et al 2006;Tseng et al 2010). In the present study, positive correlations were found between phytoplankton responses and runoff.…”

Section: Discussionmentioning

confidence: 99%

Typhoon effects on phytoplankton responses in a semi-closed freshwater ecosystem

Lai

Chen

et al. 2016

Mar. Freshwater Res.

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Analyses of past typhoons have suggested that global climate change may result in increases in the intensity of these episodic events and that the effects of typhoons on the biogeochemistry of aquatic ecosystems will also be strengthened. We collected a 2-year time series of phytoplankton responses, including chlorophyll-a concentration, primary production and turnover rate in the Fei-Tsui Reservoir, Taiwan, on the basis of five typhoons in 2011 and eight in 2012 (21 weeks affected). We found approximately a two-fold increase in phytoplankton responses during the typhoon period compared with the non-typhoon period. However, there were no consistent correlations between phytoplankton responses and typhoon disturbance and length of typhoon stay. Vertical distributions of phytoplankton responses indicated that the peak values of these responses occurred both during the typhoon periods and during the non-typhoon periods occurring between two typhoons. Moreover, the strongest correlations were found between euphotic depth-averaged phosphate and primary production and turnover rate. Combined effects on phytoplankton responses could explain at least 70% of the variability. The regulation of phytoplankton responses by multiple processes and interactions among factors that operate during each typhoon event may add complexity to the challenge of detecting typhoon-driven mechanisms in such ecosystems. the aquatic food web, because it serves as a food source for all aquatic organisms that do not perform photosynthesis. Moreover, vertical migrations, as well as the diversity, community structure and temporal dynamics of phytoplankton, are responsible for steep nutrient gradients across the thermocline.

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“…However, due to the rough topography, precipitation is highly variable, ranging from 3500 mm in the southwest portion of the FRW to more than 5000 mm in the northeast during 2001-2010. This area is covered mostly by natural secondary forests dominated by tree species within the Fagaceae and Lauraceae families (Chen, 1993). Because the FRW is a water resource protection area, agricultural activities are limited to pre-existing agriculture lands, mostly tea plantations (1200 ha).…”

Section: Study Regionmentioning

confidence: 99%

Shifts in stream hydrochemistry in responses to typhoon and non-typhoon precipitation

Chang¹,

Huang²,

Wang³

et al. 2018

Biogeosciences

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Climate change is projected to increase the intensity and frequency of extreme climatic events such as tropical cyclones. However, few studies have examined the responses of hydrochemical processes to climate extremes. To fill this knowledge gap, we compared the relationship between stream discharge and ion input-output budget during typhoon and non-typhoon periods in four subtropical mountain watersheds with different levels of agricultural land cover in northern Taiwan. The results indicated that the high predictability of ion input-output budgets using stream discharge during the non-typhoon period largely disappeared during the typhoon periods. For ions such as Na + , NH + 4 , and PO 3− 4 , the typhoon period and non-typhoon period exhibited opposite discharge-budget relationships. In other cases, the discharge-budget relationship was driven by the typhoon period, which consisted of only 7 % of the total time period. The striking differences in the discharge-ion budget relationship between the two periods likely resulted from differences in the relative contributions of surface runoff, subsurface runoff and groundwater, which had different chemical compositions, to stream discharge between the two periods. Watersheds with a 17-22 % tea plantation cover showed large increases in NO − 3 export with increases in stream discharge. In contrast, watersheds with 93-99 % forest cover showed very mild or no increases in NO − 3 export with increases in discharge and very low levels of NO − 3 export even during typhoon storms. The results suggest that even mild disruption of the natural vegetation could largely alter hydrochemical processes. Our study clearly illustrates significant shifts in hydrochemical responses between regular and typhoon precipitation. We propose that hydrological models should separate hydrochemical processes into regular and extreme conditions to better capture the whole spectrum of hydrochemical responses to a variety of climate conditions.

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Behavior of storm-induced suspension interflow in subtropical Feitsui Reservoir, Taiwan

Cited by 32 publications

References 20 publications

Effect of thermal stratification on interflow travel time in stratified reservoir

Effect of thermal stratification on interflow travel time in stratified reservoir

Typhoon effects on phytoplankton responses in a semi-closed freshwater ecosystem

Shifts in stream hydrochemistry in responses to typhoon and non-typhoon precipitation

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