The effects of Asian summer monsoons on algal blooms in reservoirs

Jung, Susanne; Shin, Myoung-Sun; Kim, Jaiku; Eum, Jaesung; Lee, Yunkyoung; Jaeyong, Lee; Choi, Young-Soon; You, Kyung-A; Owen, James S.; Kim, Bomchul

doi:10.1080/iw-6.3.967

Cited by 20 publications

(8 citation statements)

References 24 publications

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“…The pattern of the spatial and temporal distribution of water quality parameters showed heterogeneity and was regulated by the hydrological parameters, zonations of the reservoir, land-use patterns, and tributary streams [8,9,24,41]. Previous studies on lentic systems have found that reservoirs receive most external phosphorus and nitrogen loads from their watersheds and tributaries [4,20,24,42]. Therefore, the water quality of the tributaries determines the reservoir water quality [41].…”

Section: Discussionmentioning

confidence: 99%

“…Trophic response research based on chlorophyll-a and nutrients, for example, CHL-a-TP and CHL-a-TN have been widely used to determine the nutrient process and eutrophication diagnosis in dam reservoirs [23]. Researchers have found that TP has a stronger positive linear relationship with CHL-a than TN and directly regulates the phytoplankton growth in the Korean freshwater bodies [7,20,24]. An earlier study of Dillon pointed out that the phytoplankton growth shows the bimodal pattern modified by season and region [25].…”

Section: Introductionmentioning

confidence: 99%

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Trophic Responses of the Asian Reservoir to Long-Term Seasonal and Interannual Dynamic Monsoon

Mamun

Kim

2020

Water

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The main objectives of the study were to determine the trophic response of the temperate reservoir to seasonal and interannual variabilities of monsoon inorganic solids and nutrients along the gradients of the morphologically complex Asian reservoir using long-term datasets between 2000–2018. Nutrient regime (total nitrogen—TN, total phosphorus—TP), total suspended solids (TSS), and chlorophyll-a (CHL-a) were primarily affected by an intensity of summer monsoon and the longitudinal structure of riverine (Rz), transitional (Tz), and lacustrine (Lz) zone. The reservoir is a nitrogen-rich system and the phosphorus content of the water was relatively low, and it had low mean N:P ratios (<40), implying a P-limiting system. The Lz was a highly P-limited zone in comparison to Rz and Tz zone during both drought (2015) and flood year (2011). The TP content was higher in the mainstem (S3) than the embankment (S4 and S6) of the reservoir due to the monsoon river inputs of the nutrients. Nonparametric Mann–Kendall tests indicated that TP decreased over the long-term years in the Rz, while it did not show any trend in Tz, Lz, IT1, and IT2. TN showed an increasing trend in Rz, Tz, Lz, and IT2 except for IT1. The empirical regression model for chlorophyll nutrients showed that CHL-a had a strong positive relationship with TP (R2 = 0.67, p < 0.01) than TN (R2 = 0.06, p < 0.01), supporting the view that algal growth in lentic systems responds to TP enrichment and TP may provide a reliable basis for predicting algal biomass. The seasonality of CHL-a and TP showed a monomodal pattern and indicates that summer TP influences summer algal growth in Tz, Lz, and IT2. The water clarity (SD) of the reservoir was significantly (p < 0.01) influenced by TP (R2 = 0.62), TSS (R2 = 0.67), and CHL-a (R2 = 0.68) rather than TN (R2 = 0.10). The non-algal light attenuation coefficient (Kna) was determined mainly by suspended solids and the monsoon hydrology. The trophic state was much higher when assessments were based on TSI (CHL-a) than on TSI (TP) and TSI (SD). TSI (CHL-a) indicated the eutrophic state of the reservoirs except for the zone of Lz during the premonsoon season. Analysis of trophic state index deviation (TSID) suggested that the blue-green algae dominated the algal community, and the effects of non-algal turbidity and zooplankton grazing were minor in the reservoir.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Trophic Responses of the Asian Reservoir to Long-Term Seasonal and Interannual Dynamic Monsoon

Mamun

Kim

2020

Water

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“…Moreover, the changes we did see as a result of storms generally were smallest in deep lakes. Given the importance of temperature to phytoplankton growth (e.g., Paerl and Otten 2013), and the interest in how storms may disrupt phytoplankton communities through alterations in mixing, temperature, light, and nutrients (e.g., Vanni et al 2006; Jung et al 2016; Stockwell et al 2020), the relatively small changes in epilimnetic temperatures we observed suggest that storm‐induced temperature change may not be the driving factor affecting changes to phytoplankton growth. As storms increase in severity and frequency in many regions globally, an assessment on how storms induce alterations to other environmental conditions such as light and nutrients, and how such changes affect food web dynamics and ecosystem processes, is critically important.…”

Section: Discussionmentioning

confidence: 99%

“…The impacts of storms on water temperature, however, have largely been limited to studies of a single lake or region Doubek et al Storm-induced lake temperature changes (Robarts et al 1998;Kuha et al 2016;Kasprzak et al 2017), or constrained to one or a few storm events (Havens et al 2011;de Eyto et al 2016;Jung et al 2016). Jennings et al (2012) conducted a global study of the impacts of storms on lakes but did not perform a specific standardized assessment of storm-induced temperature changes.…”

Section: Introductionmentioning

confidence: 99%

The extent and variability of storm‐induced temperature changes in lakes measured with long‐term and high‐frequency data

Doubek

Anneville

Dur

et al. 2021

Limnology & Oceanography

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The intensity and frequency of storms are projected to increase in many regions of the world because of climate change. Storms can alter environmental conditions in many ecosystems. In lakes and reservoirs, storms can reduce epilimnetic temperatures from wind-induced mixing with colder hypolimnetic waters, direct precipitation to the lake's surface, and watershed runoff. We analyzed 18 long-term and high-frequency lake datasets from 11 countries to assess the magnitude of wind-vs. rainstorm-induced changes in epilimnetic temperature. We found small day-to-day epilimnetic temperature decreases in response to strong wind and heavy rain during stratified conditions. Day-to-day epilimnetic temperature decreased, on average, by 0.28 C during the strongest windstorms (storm mean daily wind speed among lakes: 6.7 AE 2.7 m s −1 , 1 SD) and by 0.15 C after the heaviest rainstorms (storm mean daily rainfall: 21.3 AE 9.0 mm). The largest decreases in epilimnetic temperature were observed ≥2 d after sustained strong wind or heavy rain (top 5 th percentile of wind and rain events for each lake) in shallow and medium-depth lakes. The smallest decreases occurred in deep lakes. Epilimnetic temperature change from windstorms, but not rainstorms, was negatively correlated with maximum lake depth. However, even the largest storm-induced mean epilimnetic temperature decreases were typically <2 C. Day-to-day temperature change, in the absence of storms, often exceeded storm-induced temperature changes. Because storminduced temperature changes to lake surface waters were minimal, changes in other limnological variables (e.g., nutrient concentrations or light) from storms may have larger impacts on biological communities than temperature changes.

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“…In order to enhance the water quality of the reservoir, numerous water quality management practices have been applied, such as the construction of sewage treatment plant and regulation of land development for the removal of external pollutant loading. Despite the success of various efforts, the possibility of water quality problems is high, and the water quality is still not good enough for supplying drinking water [31][32][33].…”

Section: Study Areamentioning

confidence: 99%

Contribution of Internal Nutrients Loading on the Water Quality of a Reservoir

Lee

Kim

et al. 2019

Water

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Sediment plays an important role in the water quality of a lake by acting as both a nutrient source and sink. The amount of phosphorus and nitrogen in the water depends on the internal load from the sediment as well as the external load. To estimate the effects of sediment load on the water quality of a reservoir, we applied a three-dimensional hydrodynamic and transport model based on the benthic chamber experimental results at Euiam Lake, South Korea. As shown in the sensitivity analysis results, the eutrophication period could be significantly extended by a change of phosphorus flux rates from the sediments. The increased phosphorus flux from the sediments intensifies the algal growth of Euiam Lake, which could cause serious algal bloom during spring and fall. This study provides information on nutrient concentrations in the sediment of Euiam Lake, verifies the role of the sediment as a source or sink of nutrients, and evaluates the effect of sediment release of nutrients and contaminants on water quality. This research is a useful tool in determining the effects of internal load in lakes and establishing the operation guideline for sediment management in order to maintain feasible water quality for beneficial use.

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The effects of Asian summer monsoons on algal blooms in reservoirs

Cited by 20 publications

References 24 publications

Trophic Responses of the Asian Reservoir to Long-Term Seasonal and Interannual Dynamic Monsoon

Trophic Responses of the Asian Reservoir to Long-Term Seasonal and Interannual Dynamic Monsoon

The extent and variability of storm‐induced temperature changes in lakes measured with long‐term and high‐frequency data

Contribution of Internal Nutrients Loading on the Water Quality of a Reservoir

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