Water-quality conditions in Upper Klamath Lake, Oregon, 2002-04

Wood, Tamara M.; Hoilman, Gene R.; Lindenberg, Mary K.

doi:10.3133/sir20065209

Cited by 24 publications

(39 citation statements)

References 5 publications

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“…1). The Delta straddles the last six kilometers of the Williamson River before it empties into Upper Klamath Lake, a large and shallow lake (surface area 232 km 2 , average depth 2.8 m at full pool; Wood et al 2006). The Williamson River is largely fed by the Sprague River, and together the two watersheds account for about 51% of the inflow into Upper Klamath Lake and 47% of the external P load into the lake (Boyd et al 2002).…”

Section: Study Areamentioning

confidence: 98%

Nutrient Release from a Recently Flooded Delta Wetland: Comparison of Field Measurements to Laboratory Results

et al. 2011

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Wetland restoration is expected to reduce external phosphorous (P) loading to hypereutrophic Upper Klamath Lake in Oregon, USA, where P was identified as the primary driver of lake productivity. However, previous laboratory experiments showed that a large P release could occur when former agricultural land is re-flooded for restoration, thus presenting an initial challenge for wetland restoration projects. We tested whether results from those experiments were supported during the initial phase of restoration at the Williamson River Delta adjacent to Upper Klamath Lake. Our objectives were to document post-flood surface water nutrient concentrations, estimate the P mass released from the newly flooded wetlands, and compare these results to the laboratory experiments. Phosphorus concentrations in the wetlands ranged from 0.1 to 0.63 mg P/L and were up to six times greater than in the lakes, corroborating that the wetlands released P upon flooding. However, we estimated 2 Mg P released within three weeks of flooding, which is much lower than the anticipated 64-Mg release from these wetlands, and a fraction of the annual 21-25 Mg load from the Delta before reconnection. This pulse is expected to be short-term; longer term studies will address the role of these wetlands in retaining nutrients.

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Section: Study Areamentioning

confidence: 98%

Nutrient Release from a Recently Flooded Delta Wetland: Comparison of Field Measurements to Laboratory Results

et al. 2011

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“…An alternative approach is to use high resolution schemes with flux-limiter functions. The highresolution scheme developed by Sweby (1984) has been successfully applied and improved over the past years (Casulli and Zanolli, 2005;Wang et al, 2008;Wood et al, 2008).…”

Section: F F Pereira Et Al: Assessment Of Numerical Schemesmentioning

confidence: 99%

Assessment of numerical schemes for solving the advection–diffusion equation on unstructured grids: case study of the Guaíba River, Brazil

Pereira

Fragoso

Uvo

et al. 2013

Nonlin. Processes Geophys.

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Abstract. In this work, a first-order upwind and a high-order flux-limiter schemes for solving the advection-diffusion equation on unstructured grids were evaluated. The numerical schemes were implemented as a module of an unstructured two-dimensional depth-averaged circulation model for shallow lakes (IPH-UnTRIM2D), and they were applied to the Guaíba River in Brazil. Their performances were evaluated by comparing mass conservation balance errors for two scenarios of a passive tracer released into the Guaíba River. The circulation model showed good agreement with observed data collected at four water level stations along the Guaíba River, where correlation coefficients achieved values up to 0.93. In addition, volume conservation errors were lower than 1 % of the total volume of the Guaíba River. For all scenarios, the higher order flux-limiter scheme has been shown to be less diffusive than a first-order upwind scheme. Accumulated conservation mass balance errors calculated for the flux limiter reached 8 %, whereas for a first-order upwind scheme, they were close to 18 % over a 15-day period. Although both schemes have presented mass conservation errors, these errors are assumed negligible compared with kinetic processes such as erosion, sedimentation or decay rates.

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“…Therefore, the surface in-situ water temperature would lead to some error of calibration. However, some researchers also suggested that the lake water temperature was relative stable in late evening or early morning on most days [36,37]. So the most surface samples collections in this study were in the morning to avoid more in-situ temperature error.…”

Section: Kmentioning

confidence: 89%

Calibration of the U 37 K′ index of long-chain alkenones with the in-situ water temperature in Lake Qinghai in the Tibetan Plateau

Wang

Liu

2012

Chin. Sci. Bull.

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Long-chain alkenones (LCAs) can potentially be used as indicators to understand past variations in lacustrine environments. Previous research has suggested that the relationship between the temperature and the unsaturation index of LCAs should be calibrated individually, because of the possible variations in the alkenone-producing algal species in the lacustrine environment. In this work, we have calibrated U 3 K 7 ′ of water filter samples against the in-situ water temperature in Lake Qinghai, Tibetan Plateau. There are significant relationships between U 3 K 7 ′ and the water temperature, a non-linear relationship was derived. Because the U 3 ′ index of long-chain alkenones with the in-situ water temperature in

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Water-quality conditions in Upper Klamath Lake, Oregon, 2002-04

Cited by 24 publications

References 5 publications

Nutrient Release from a Recently Flooded Delta Wetland: Comparison of Field Measurements to Laboratory Results

Nutrient Release from a Recently Flooded Delta Wetland: Comparison of Field Measurements to Laboratory Results

Assessment of numerical schemes for solving the advection–diffusion equation on unstructured grids: case study of the Guaíba River, Brazil

Calibration of the U 37 K′ index of long-chain alkenones with the in-situ water temperature in Lake Qinghai in the Tibetan Plateau

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