首页期刊导航|Lake and reservoir management: an international journal of the North American lake management society
期刊信息/Journal information
Lake and reservoir management: an international journal of the North American lake management society
Taylor & Francis Group
Taylor & Francis Group
季刊
1040-2381
Lake and reservoir management: an international journal of the North American lake management society/Journal Lake and reservoir management: an international journal of the North American lake management societySCI
查看更多>>摘要：Global lakes are shrinking due to intensive human interference and climate change. However, a comprehensive understanding of lake variations within mega river systems has been poorly documented. Here, lake dynamics of the mega-Changjiang River Basin (CRB) are explored by multiple images and hydrological observations between 1990 and 2020. The lake area in the CRB declined significantly by 91.58km~2/yr and 101.11 km~2/yr in the flood season and dry season, respectively, while the lake number only exhibits an obvious decrease of 0.25 lakes/ yr in the flood season. Furthermore, small lakes remain relatively stable, and medium-size lakes experience a minor decline/increase during the flood/dry season, while large lakes exhibit an intensive decrease during the dry season. Lakes in the upper Changjiang increase in area due to glacier melting caused by rising temperatures. Lake area declines in midstream and the lower stream were induced by Changjiang riverbed downcutting triggered by Three Gorges Dam regulation, as well as by large-scale human reclamations. In addition, seasonal differences in precipitation can cause lake size fluctuations from the flood season to the dry season. Our results underscore the response of the lake system to anthropogenic interference and climate change, providing valuable insights for sustainable lake management and protection.
Sergio A. ValbuenaS. Geoffrey SchladowFabian A. Bombardelli
16-33页
查看更多>>摘要：Boating activity in shallow waters of lakes can lead to sediment resuspension and potential nutrient release, affecting water quality parameters. No-wake zones, to minimize boating-induced effects, are often defined based on distance from shore. This study assessed the effects of boating on shallow waters and the efficacy of an existing no-wake zone policy in a midsize lake. Two experiments were conducted: (1) Turbidity and pressure data were collected along a broad shallow shelf on the southern shore of Lake Tahoe in the summer of 2019 and (2) turbidity and pressure observations were conducted while boats traveled at speeds between 8 kmh~(-1) (5 mph) and 40 kmh~(-1) over a water depth of ≈ 2.5 m. Results showed that boat-induced sediment resuspension occurred at speeds exceeding 8 kmh~(-1), with turbidity increases of up to ~7 NTU. Boat-induced filtered pressure signal was a maximum of 40% of the total daily wave activity, with peaks observed between 10:00 and 12:00. Nevertheless, during the summer and fall of 2019, winds were the dominant driver of sediment resuspension, contributing around 80% of the total wavefield. An evaluation of the current no-wake zone policy at Lake Tahoe suggested that an 8 kmh~(-1) (5 mph) speed limit is suitable for preventing wake effects. However, the policy falls short in preventing sediment resuspension in the northwestern and southern shores of Lake Tahoe. This calls for the consideration of multiple variables, such as lakebed sediment type and water depth, when defining no-wake zone policies to effectively mitigate boating-induced effects.
查看更多>>摘要：Aquatic thrusters are an emerging tool for waterfront landowners to control at a small scale of aquatic plants, algae, and ice cover. Their potential effects to shallow lake aquatic ecosystems remain understudied. During the summer of 2021, 3 aquatic thrusters were installed on docks within the Kawartha Lakes, Ontario, Canada, in a before-after control-impact approach. The aquatic thrusters were operational for 40d in July to August, 12h each night, in the shallow nearshore areas, at a fixed horizontal position. Aquatic thrusters significantly reduced plant surface area by 64.9%, floating cover by 70.1%, and plant biomass by 52.0-94.6% in front of the aquatic thrusters, extending approximately 10 m~2 into dense aquatic plant beds. Aquatic thrusters caused no significant changes to field water quality, which might have been a result of horizontal positioning of the aquatic thrusters that minimized turbulent water from impacting lake substrates. Further research is required given the potential for aquatic thrusters to affect the biological, physical, and chemical aspects of aquatic ecosystems.
Johanna M. BlakeChristina L. FergusonJeb E. BrownRachel Mixon...
41-58页
查看更多>>摘要：There is an increasing need for additional water storage in the United States, especially in arid regions. Alternatives like decommissioned power plant raw-water reservoirs would be cheaper to use than creating new reservoirs; however, the biogeochemical pollution risk of these reservoirs is not well understood. The San Juan Generating Station power plant and the associated reservoir will be used as a sediment-settling basin to store drinking water. To evaluate whether the reservoir is appropriate for this use, inorganic and organic constituents of concern were measured in reservoir sediment cores, pore water, and reservoir water in 2020. Forty-six percent of sediment arsenic concentrations measured in core subsamples (8 to 12mg/kg) were slightly above the New Mexico residential cancer threshold for soil of 7.07mg/kg. One sediment sample contained elevated total barium concentrations (6020mg/ kg). The organic compounds analyzed were either below detection limits or below regulatory thresholds. Reservoir water had one sample with arsenic greater than the drinking water standard (10μg/L). Overall, the reservoir sediment inorganic and organic analyte concentrations are within acceptable ranges. The few samples that have elevated concentrations are not of a sufficient magnitude that dilution and/or treatment processes would preclude the use of the reservoir for water storage. Our findings show potential for use of former coal power station raw-water reservoirs as drinking-water reservoirs after plant closure.
Taylor N. Preul-StimetzStephanie L. ShawGreg G. Sass
59-74页
查看更多>>摘要：The loss of vital littoral zone and riparian habitat due to lakeshore residential development is a pervasive issue across temperate aquatic ecosystems. Oligotrophic glacial lakes may be particularly vulnerable to reductions in coarse woody habitat (CWH) due to their lack of alternative structural habitat Although influences of CWH on fish populations have been well documented, questions remain regarding CWH influences on lower trophic levels and water quality. We conducted a whole-lake CWH addition experiment within a BACI framework using 2 lakes, Sanford (treatment) and Escanaba (reference), in the Northern Highland Lake District of Wisconsin. Premanipulation monitoring began in 2015, trees were dropped in 2018, and data collection continued until 2023. We monitored limnological, planktonic, and benthic macroinvertebrate parameters to test whether CWH addition initiated trophic shifts and altered the structure of the aquatic food web. We found that CWH addition minimally affected water quality and changed some characteristics of Sanford Lake at lower trophic levels. Chlorophyll a concentrations in Sanford Lake significantly increased but Secchi depth was unaffected. The abundance of macrophytes increased in both systems; that in Sanford Lake increased more and was linked to the CWH addition. Dissolved oxygen significantly increased at multiple depth strata. Water temperature was unaffected. We observed declines in total zooplankton that were not related to CWH addition, but the decline in relative abundance of large grazers was. Our results provide a mechanistic understanding of the effects of habitat enhancement at an ecosystem scale and can help guide stakeholder and manager expectations following CWH addition.
NETL
NSTL
Taylor & Francis