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Dissolved Oxygen in the Tualatin River, Oregon Under Winter Low-Flow Conditions, November 1992
Published in Antonius Laenen, David A. Dunnette, River Quality, 2018
The Tualatin River Basin is a subbasin of the Willamette River, OR, and drains an area of 712 mi2 in Washington County, west of Portland, Oregon (Figure 1). The direction of flow is generally from west to east for 79.4 mi through a watershed of diverse land uses. Although the headwaters are in the steep, forested Coast Range, the river flows for most of its length through a low-gradient valley plain characterized by forest and croplands, interspersed with an increasingly urbanized region, before it joins the Willamette River at West Linn, OR. The full length of river encompassed by this study extended from river mile (RM) 58.8 to the river mouth at Weiss Bridge (RM 0.2) just downstream from the USGS streamflow gaging station at West Linn (RM 1.8).
Dynamic Modeling of Estuaries
Published in James L. Martin, Steven C. McCutcheon, Robert W. Schottman, Hydrodynamics and Transport for Water Quality Modeling, 2018
James L. Martin, Steven C. McCutcheon, Robert W. Schottman
The Savannah estuary between Georgia and South Carolina is tidal for approximately 72 km (45 mi) upstream of the mouth near Savannah (or River Kilometer 71.9; River Mile 44.7, Figure 18). A deep draft harbor is maintained near the city of Savannah up to River Kilometer 34.3 (River Mile 21.3). The tidal variation is over 2 m (6.6 ft) in the estuary, only exceeded on the U.S. Atlantic Coast in Maine. One unique feature of the estuary is the presence of a tide gate (Figure 18) constructed to reduce sedimentation in the harbor. The gate is operated so that it is open during the flood tide and closed during the ebb tide, in order to force the tidal prism back through the harbor area.
Hazmat Team Spotlight
Published in Robert A. Burke, Hazmat Team Spotlight, 2020
This sea port is the second largest inland port on the shallow draft portion of the Mississippi River, and the 4th largest inland Port in the United States. International Port of Memphis covers the Tennessee and Arkansas sides of the Mississippi River from river Mile 725 to mile 740. Within this 15 mile reach, there are 68 water fronted facilities, 37 of which are terminal facilities moving products such as petroleum, tar, asphalt, cement, steel, coal, salt, fertilizers, rock & gravel, and coarse grains. The International Port of Memphis is 400 river miles from St. Louis and 600 River miles from New Orleans and is ice free year round.
Long-term trends in inflowing chlorophyll a and nutrients and their relation to dissolved oxygen in a large western reservoir
Published in Lake and Reservoir Management, 2023
Jesse Naymik, Chris A. Larsen, Ralph Myers, Chuck Hoovestol, Nick Gastelecutto, Dain Bates
Mean daily streamflow data for Brownlee Reservoir inflow were from the US Geological Survey (USGS) Snake River at Weiser gauge (number 13269000). Inflow nutrient, Chl-a, and total suspended solids (TSS) datasets were combined from grab samples at river mile 340 (547 river km, 1995–2003) and hand-deployed depth-integrated sampling (2003–2015, 2018–2021), or grab samples (2016–2017), at the deepest portion of the river from a bridge to an island at river mile 345.6 (556 river km, Fig. 1). Samples collected on the same days from both Brownlee Reservoir inflow locations in 2002 and 2003 for Chl-a (n = 13) and nutrient constituents (n = 5) showed no significant differences using a paired t-test (P > 0.05). Frequency of the nutrient, Chl-a, and TSS sampling was approximately every other week but was adjusted over the 27 years (Supplementary material, Table S1).
Estimation of fish consumption rates based on a creel angler survey of an urban river in New Jersey, USA
Published in Human and Ecological Risk Assessment: An International Journal, 2020
Betsy Ruffle, Suzanne Baird, Gemma Kirkwood, F. Jay Breidt
A CAS was conducted on the lower 17.4 miles of the Passaic River (Lower Passaic River Study Area [LPRSA]) to collect the data necessary to estimate the size of the fishing and consuming populations and to calculate exposure factors, including fish consumption rate, for anglers who consume their catch. This paper focuses on estimating angler population size and fish consumption rate. The LPRSA is located within the Greater New York-New Jersey Harbor Area and stretches from the confluence with Newark Bay (located at river mile [RM] 0) to Dundee Dam (RM 17.4) (Figure 1). It flows through both residential and highly urbanized and industrial areas, including Newark, New Jersey. Within this portion of the river, industrial activity and discharges from combined sewer overflows, storm water outfalls, and nonpoint source urban runoff have resulted in a variety of environmental contaminants in river sediments, including dioxins, PCBs, heavy metals, and pesticides. Although an advisory warning against consumption of all fish and crab from the Lower Passaic River has been in effect since the 1980s, anglers have been observed keeping their catch (Desvousges et al. 2001; NJDEP 1995).
Simulation and control of sediment transport due to dam removal
Published in Journal of Applied Water Engineering and Research, 2018
Marmot Dam was the only dam on the main-stem of the Sandy River, Oregon, USA (Figure 1(a)). The Sandy River extends approximately 89 km from its headwater to its confluence with the Columbia River. The dam was located near the middle of the basin at river mile (RM) 30 (or river kilometre (rkm) 48.3), downstream of the Salmon River confluence but upstream of the Bull Run River confluence and 2 km upstream of the entrance to the Sandy River gorge. Marmot Dam, a 14.3-m-high and 105.2-m-long roller-compacted concrete dam, was built in 1989 to replace an earlier timber structure, which was originally constructed in 1913. Portland General Electric (PGE), the owner and operator of the dam, decided to build a temporary cofferdam upstream of Marmot Dam to facilitate the removal of the dam body and prevent the disturbance of the deposited sediment behind the dam. After the dam was removed, the cofferdam was breached to allow the 80-km-long Sandy River to flow freely from Mount Hood, Oregon, to its confluence with the Columbia River (Major et al. 2012). The breaching of the cofferdam was started on 19 October 2007.