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Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
This paper models the dynamics of total phosphorus in lakes as a first-order linear system with time dependent coefficients. The model has one source term for phosphorus, the total inflow to the lake. Two sink terms remove phosphorus from the model lake, the outflow from the lake, and sedimentation to the lake bottom. The forced response of the model is calculated using 16 years of published inflow data from Lake Washington as input. Results are compared with the measured response for Lake Washington following sewage diversion from the lake.
Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
This paper models the dynamics of total phosphorus in lakes as a first-order linear system with time dependent coefficients. The model has one source term for phosphorus, the total inflow to the lake. Two sink terms remove phosphorus from the model lake, the outflow from the lake, and sedimentation to the lake bottom. The forced response of the model is calculated using 16 years of published inflow data from Lake Washington as input. Results are compared with the measured response for Lake Washington following sewage diversion from the lake.
Author: Carla J. Stevens Publisher: ISBN: Category : Water Languages : en Pages : 132
Book Description
Upper Klamath Lake (UKL) and Agency Lake in south-central Oregon are hypereutrophic due to phosphorus (P) loading from both geologic and agricultural sources in the watershed. Restoring historic lake-fringe wetlands to provide P sinks around the lakes has been accepted as a favorable means of reducing lake P levels and loading. Hydrologic management strategies differ in their timing of wetland filling and draining, and they may have significantly different outcomes on P forms and concentrations released to the lakes. To evaluate the effects of hydrologic management on P loading to the lakes, we investigated the biotic and abiotic mechanisms of P release related to timing and duration of inundation of wetland soils from four restoration sites through a laboratory and field study. More specifically, we evaluated four hypotheses related to hydrologic management and P release in the restored wetlands: 1) timing (temperature) of inundation affects the concentrations and forms of P released in study wetlands, 2) the nature of P dynamics in the study wetlands releases primarily soluble reactive phosphorus (SRP), as opposed to organic P, 3) abiotic factors including dissolved oxygen, pH, redox, organic matter, and bulk density levels influence P release, and 4) soil P fractions change over time with different flooding regimes. These hypotheses were investigated in a lab experiment in which dry wetland soil cores were flooded for 56 days and included sampling of total phosphorus (TP), SRP, dissolved oxygen (DO), pH, redox, and CO2. Measurements were also taken on soil cores when dry, flooded for one day, after experiment flooding, and after flooding in the field for soil pH, organic matter, bulk density, total P, microbial P, and inorganic P fractions. Higher release rates of TP were found in summer temperature treatments in all wetlands while release of SRP varied more with temperature and abiotic factors. Low DO and redox levels also influenced greater release of P from soil cores. Soil solution pH upon flooding resulted in dissolution of inorganic P fractions, leading to release of SRP to the water column. After dissolution, wetlands with mineral soils had greater capacities of adsorbing SRP into P fractions than the wetlands with organic soils. Microbial P was also a factor in SRP release; saturated biological demand resulted in higher mineralization than immobilization rates in two wetlands. Our data indicate that wetlands with hydrologic connectivity to the lakes and mineral soils released the lowest concentrations of TP, while SRP was variable. Further, our data provide evidence for determining best management strategies for wetlands to lower P loading to the lakes, which should be based upon soil type, how inorganic P is held in soil fractions, microbial activity, and the effect of abiotic factors such as temperature, DO, redox, and pH.
Author: Bernard C. Kenney Publisher: Saskatoon : Inland Waters Directorate, National Hydrology Research Institute, National Hydrology Research Centre ISBN: Category : Eutrophication Languages : en Pages : 32
Book Description
The phosphorus loading concept is examined within the framework of equilibrium input-output models. Some theoretical and practical shortcomings of several phosphorus models are then discussed. Finally, the dynamics of total phosphorus in lakes is explored using first-order linear theory with time-dependent coefficients.
Author: Stefan Schmutz Publisher: Springer ISBN: 3319732501 Category : Science Languages : en Pages : 562
Book Description
This open access book surveys the frontier of scientific river research and provides examples to guide management towards a sustainable future of riverine ecosystems. Principal structures and functions of the biogeosphere of rivers are explained; key threats are identified, and effective solutions for restoration and mitigation are provided. Rivers are among the most threatened ecosystems of the world. They increasingly suffer from pollution, water abstraction, river channelisation and damming. Fundamental knowledge of ecosystem structure and function is necessary to understand how human acitivities interfere with natural processes and which interventions are feasible to rectify this. Modern water legislation strives for sustainable water resource management and protection of important habitats and species. However, decision makers would benefit from more profound understanding of ecosystem degradation processes and of innovative methodologies and tools for efficient mitigation and restoration. The book provides best-practice examples of sustainable river management from on-site studies, European-wide analyses and case studies from other parts of the world. This book will be of interest to researchers in the field of aquatic ecology, river system functioning, conservation and restoration, to postgraduate students, to institutions involved in water management, and to water related industries.
Author: Bernard C. Kenney Publisher: Saskatoon : Inland Waters Directorate, National Hydrology Research Institute, National Hydrology Research Centre ISBN: Category : Eutrophication Languages : en Pages : 28
Book Description
Saskatchewan's Fishing Lakes, the primary recreation lakes for residents of Regina, are plagued by immense blooms of algae throughout the summer. The algae thrive on high concentrations of nutrients, particularly phosphorus. The dynamics of phosphorus in lakes are normally controlled by water renewal rates and sedimentation. In this report, the theory of phosphorus dynamics was extended to include a chain of lakes like the Fishing Lakes. A model was developed based on the water renewal or outflow time scale, the sedimentation time scale, and the water inflow time scale. The dynamic variation of phosphorus in the Fishing Lakes from 1980-83 was then simulated using the phosphorus inflow concentrations measured every 3 days by WQB and the daily water flows as input data. A second simulation was run using the sparse data set that was available for phosphorus inflow from 1970-79. The calculated outputs were directly compared with the measured outflow concentrations.
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Author: Carla J. Stevens
Author: Dale M. Robertson
Author: Bernard C. Kenney
Author: William J. Rose
Author: Stefan Schmutz
Author: 
Author: Eugene B. Welch
Author: Bernard C. Kenney
Author: Thomas Charles Young