Lake trophic state change and constant algal composition following dilution and diversion

Welch, Eugene B.; Barbiero, Richard P.; Bouchard, Debra; Jones, Clain

doi:10.1016/0925-8574(92)90001-i

Cited by 61 publications

(47 citation statements)

References 19 publications

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“…Only a few studies have concentrated on the effects of water transfers on the physical and chemical changes to water quality. On the one hand, water transfers can improve the trophic state of the receiving water via dilution (Hu et al, 2008;Welch and Patmont, 1980;Welch et al, 1992;Zhai et al, 2010). The water quality of downstream reservoirs could also be improved by using upstream reservoirs as storage to store nutrient loads (Padisak et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

The potential impact of an inter-basin water transfer project on nutrients (nitrogen and phosphorous) and chlorophyll a of the receiving water system

Zeng

Qin

2015

Science of The Total Environment

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Section: Introductionmentioning

confidence: 99%

The potential impact of an inter-basin water transfer project on nutrients (nitrogen and phosphorous) and chlorophyll a of the receiving water system

Zeng

Qin

2015

Science of The Total Environment

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“…That switch may have caused the observed gradual decrease in SRP from 32 to 7 µg/L and TP from 119 to 47 µg/L in the background surface inflow entering via Crab Creek (site 3) during the l970s and 1980s (Welch et al 1992). Wastewater diversion had a major effect in Middle Pelican Horn, a minor effect in South Lake and no effect in Parker Horn (Welch et al 1992). …”

Section: Description Of Moses Lakementioning

confidence: 99%

“…2). That quantity represents about 1.1 lake volumes, which would reduce water residence time to about 0.4 years if the April-September flows represented the whole year (Welch et al 1992). The lake has continued to receive dilution water each year, except in 1984.…”

Section: Description Of Moses Lakementioning

confidence: 99%

“…Parker Horn (site 7; Fig. 1) and South Lake (site 9) together represent 26% of the lake's area and have been used to illustrate the trends in water quality (Welch et al 1992) because most of the dilution water entering via Crab Creek passed through those sections. However, the lower part of Rocky Ford Arm (Cascade, site 8), representing another 14% of the lake's area, also received dilution water and had similar water quality as Parker Horn.…”

Section: Description Of Moses Lakementioning

confidence: 99%

“…The lake was sampled twice monthly at eight sites from April through September during 1969and 1977-1988, Welch et al 1992. Water was collected at a depth of 0.5 m across a series of transects (Fig.…”

Section: Sampling Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

Should nitrogen be reduced to manage eutrophication if it is growth limiting? Evidence from Moses Lake

Welch¹

2009

Lake and Reservoir Management

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Four decades of diluting phosphorus to maintain lake quality

Welch

Brattebo

Overland

2019

Water Environment Research

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Dilution with low-nutrient Columbia River Water (CRW) has markedly improved Moses Lake quality for 42 years. There were two phases of CRW volume input, which proportionately lowered total phosphorus (TP). Initially, spring-summer inputs averaged 130 × 106 m 3 during 1977-1988 reducing average TP from 152 to 65 µg/L in half the lake proximal to the inputs. That input represented 1.5 volumes of that half-lake volume. Inputs doubled through the mid-1990s, and nearly 2.5 times since 2000, decreasing TP to a 18-year average of 24 µg/L. Chlorophyll a (chl) decreased further from 18 µg/L during the early dilution years to about 6 µg/L as TP declined. Cyanobacteria biovolume declined to 57% of total biovolume during 1977-1988 from 98% before dilution. Less (65%) CRW water since 2016 led to higher TP (41 µg/L) and chl (18 µg/L) in 2018, while cyanobacteria averaged 87% of total biovolume. More TP and cyanobacteria in 2018 are attributed to more internal TP loading. Increased N:P ratios have possibly given more advantage to the non-N-fixing cyanobacteria Microcystis, which comprised 82% and 74% of maximum cyanobacteria biovolume in 2017 and 2018. • Practitioner points• Lake total phosphorus (TP) was reduced 57% in the 1970s-1980s by adding large volumes of low-nutrient Columbia River water (CRW). • Total P was further reduced by 65% since 2000 by more than doubling the earlier CRW input to an average spring-summer concentration of 24 μg/L. • Less (65%) CRW during 2017-2018 led to higher lake TP (41 μg/L) and a worse cyanobacteria bloom in 2018. • Microcystis, an non-nitrogen fixer, was the dominant cyanobacteria in 2017-2018 likely related to higher N:P ratios.

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Lake trophic state change and constant algal composition following dilution and diversion

Cited by 61 publications

References 19 publications

The potential impact of an inter-basin water transfer project on nutrients (nitrogen and phosphorous) and chlorophyll a of the receiving water system

The potential impact of an inter-basin water transfer project on nutrients (nitrogen and phosphorous) and chlorophyll a of the receiving water system

Should nitrogen be reduced to manage eutrophication if it is growth limiting? Evidence from Moses Lake

Four decades of diluting phosphorus to maintain lake quality

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