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Water quality impacts of small-scale hydromodification in an urban stream in Connecticut, USA

Ecological Processes 2018年第1期7卷 106-115页

作者： Bin Zhu Daniel S.Smith Anthony P.Benaquista Dylan M.Rossi Betsy M.Kadapuram Man Lok Yu Andrew S.Partlow Nathan R.Burtch Department of Biology University of Hartford200 Bloomfield AvenueWest HartfordCT 06117USA College of Marine and Environmental Sciences James Cook University1 James Cook DriveTownsvilleQLD 4811Australia Department of Geography and Environmental Planning Towson University8000 York RoadTowsonMD 21252USA

Introduction:Construction activities in and along urban streams increase the sediment input into surface waters,causing an overall decline in water quality and aquatic *** this case study,we investigate the water quality impacts of local hydromodification in an urban stream(discharge 0.4 m^(3)/s).At the site of interest,workers removed a stream crossing consisting of an embankment with culverts and replaced it with a small bridge(single span of 25 m)in an effort to improve flow ***:Water samples were taken at four sites along the North Branch Park River in Connecticut,Northeastern United *** and dissolved oxygen(DO)were measured in situ,and nitrate and total phosphorus(TP)were measured in the *** macroinvertebrate samples were also collected and analyzed for taxon richness and Shannon-Weaver species *** were compared between upstream and downstream sites and before,during,and after *** used one-way ANOVA combined with the post hoc Turkey test to derive statistical ***:During construction,turbidity increased temporarily by 60.9%[from 2.48 Nephelometric Turbidity Units(NTU)over ambient to 4.00 NTU].Once construction was completed,DO increased locally from 11.0 to 13.0 mg/*** macroinvertebrate taxon richness and species diversity declined by 61.6 and 32.6%respectively,with no recovery observed in the year following *** quality was only affected within 50 m *** and TP concentrations were ***:Small-scale hydromodification temporarily increased the turbidity as a result of increased sediment input,approaching the maximum level for clean water(5 NTU).Benthic macroinvertebrate communities declined in the immediate downstream vicinity of construction but are expected to recover soon given that turbidity recovered to pre-construction levels,and DO *** outcomes emphasize that environmental assessment is important not

关键词： Urban streams Pollution hydrologic services Water quality Benthic macroinvertebrates North Branch Park River

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hydrologic Monitoring Plan of the Brazilian Water Producer/PCJ Project

引用

Journal of Environmental Protection 2016年第12期7卷 1956-1970页

作者： Denise Taffarello João Guimarães Regiane Kock de Sousa Lombardi Maria do Carmo Calijuri Eduardo Mario Mendiondo Hydraulics & Sanitary Department Escola de Engenharia de Sao Carlos University of Sao Paulo Sao Carlos Sao Paulo Brazil Fauna and Flora International Biodiversity Partnership Curitiba Paraná Brazil Lombardi Topografia e Agrimensura Curitiba Paraná Brazil Brazilian Center of Monitoring and Early Warning of Natural Disasters (CEMADEN) Sao Jose dos Campos Sao Paulo Brazil

Both Ecosystem-based Adaptation (EbA) and Payment for Ecosystem services (PES) have a wide range of strategies that include different economic instruments for nature conservation. Although the generation and maintenance of payment for hydrologic ecosystem services (Water-PES) is expanding in Brazil, there are difficulties in the implementation of projects. Due to the complexity and non-linearity of the hydrological processes, also affecting both EbA and Water-PES goals, monitoring quali-quantitative aspects of streams have been here addressed as a useful management tool. This study presents the hydrological Monitoring Plan (HMP) of the Water Producer/PCJ project, operating between 2009-2014, in order to: 1) evaluate the impact of project actions under water quali-quantitative aspects;and 2) promote the incorporation of HMP’s elements in water resources management. HMP of the Water Producer/PCJ project has been implemented following the conditions for efficiency (baseline, long-term scale compatible with the actions of the project, in the experimental and reference watersheds). In addition, HMP is being implemented from upstream to downstream in catchments with areas ranging from 17 to 130 km2. This proposal favors the quantification and valuation of hydrologic services that could be assessed by ecohydrologic monitoring and modeling. Thus, we look forward to the consolidation of the Brazilian information system of water resources, the reduction of modeling uncertainties and integrated assessment of the consequences of land-use/land-cover change that strongly impact goals of EbA and Water-PES initiatives.

关键词： Ecohydrological Monitoring Brazilian Water Producer/PCJ Project hydrologic services Quali-Quantitative Aspects of Water Resources

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