- Nitrate removal in surface-flow constructed wetlands treating dilute . . .
Constructed treatment wetlands (CTWs) have been shown to be an effective, economical, and ecologically sustainable method to treat N-contaminated wastewaters and non-point sources (Kadlec and Knight, 1996, Horne and Fleming-Singer, 2005) The N biogeochemical cycle within wetland ecosystems is complex and involves numerous transformations including ammonia volatilization, ammonification, N
- Floodplain restoration increases hyporheic flow in the Yakima River . . .
The Gap to Gap reach of the Yakima River, Washington (Fig 1) has experienced nearly 50 floods since 1894 with the largest flood in 1933 (Yakima County, WA, 2006-2016), which led to the construction of a federal levee system (Anchor and LLC, 2014) Levees were constructed for controlling erosion and flood protection While levees are intended to prevent overbank flows (Heine and Pinter, 2012
- Nitrate removal in surface-flow constructed wetlands treating dilute . . .
Constructed treatment wetlands (CTWs) have been used effectively to treat a range of wastewaters and non-point sources contaminated with nitrogen (N) But documented long-term case studies of CTWs treating dilute nitrate-dominated agricultural runoff are limited This study presents an analysis of four years of water quality data for a 1 6-ha surface-flow CTW treating irrigation return flows
- Nitrate removal processes in a constructed wetland treating drainage . . .
The 15 N stable isotope may be used as a tracer to study the fate and transformation of N in soil–plant systems A limited number of studies have applied this technique in wetland environments, most often using enclosed in situ plots (Moraghan, 1993, Xue et al , 1999) or reconstituting the wetland plant–soil system in laboratory microcosms (Lusby et al , 1998, Matheson et al , 2002)
- Implications for constructed wetlands to mitigate nitrate and pesticide . . .
Suggestions are also made for FWS CW design (a geotechnical survey, topography constraints, etc ) respecting ecological engineering concepts A following size range is proposed: 76 m 3 per drained hectare, equivalent to 1% of the upstream area, given a maximum water depth of 0 8 m Nevertheless, CWs must be considered as a complementary tool dedicated to transfer reduction, and as part of
- Overwinter changes to near-surface bulk density, penetration resistance . . .
This research is part of collaboration between the US Army Engineer Research and Development Center's Cold Regions Research and Engineering Laboratory and the United States Department of Agriculture, Agricultural Research Service to determine soil freeze-thaw effects on hydraulic geometry, soil strength, infiltration, runoff erosivity, and soil erodibility of vehicular ruts and natural rills
- Growth of young - ScienceDirect
Growth in height, diameter, and volume was measured on 9- to 18-year-old ponderosa pine (Pinus ponderosa) and 10- to 13-year-old lodgepole pine (Pinus contorta) trees growing on or near compacted skid trails in the Yakima Indian Reservation in south-central Washington Soil bulk density of the 0- to 30 5-cm deep layer was measured with a single-probe nuclear densimeter on two sides of each
- Engineering | Journal | ScienceDirect. com by Elsevier
The official journal of the Chinese Academy of Engineering and Higher Education Press Engineering is an international open-access journal that was launched by the Chinese Academy of Engineering (CAE) in 2015 Its aims are to provide a high-level platform where cutting-edge advancements in engineering R D, current major research outputs, and key achievements can be disseminated and shared; to
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