scholarly journals Quantifying habitat benefits of channel reconfigurations on a highly regulated river system, Lower Missouri River, USA

2017 ◽  
Vol 103 ◽  
pp. 59-75 ◽  
Author(s):  
Susannah O. Erwin ◽  
Robert B. Jacobson ◽  
Caroline M. Elliott
Keyword(s):  
Missouri River ◽  
River System ◽  
Regulated River

scholarly journals Robust global sensitivity analysis of a river management model to assess nonlinear and interaction effects

2014 ◽  
Vol 18 (9) ◽  
pp. 3777-3785 ◽  
Author(s):  
L. J. M. Peeters ◽  
G. M. Podger ◽  
T. Smith ◽  
T. Pickett ◽  
R. H. Bark ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Driving Forces ◽  
Potential Evapotranspiration ◽  
Nonlinear Effects ◽  
River System ◽  
River Management ◽  
Interaction Effects ◽  
Regulated River ◽  
Management Model ◽  
Sensitivity Indices

Abstract. The simulation of routing and distribution of water through a regulated river system with a river management model will quickly result in complex and nonlinear model behaviour. A robust sensitivity analysis increases the transparency of the model and provides both the modeller and the system manager with a better understanding and insight on how the model simulates reality and management operations. In this study, a robust, density-based sensitivity analysis, developed by Plischke et al. (2013), is applied to an eWater Source river management model. This sensitivity analysis methodology is extended to not only account for main effects but also for interaction effects. The combination of sensitivity indices and scatter plots enables the identification of major linear effects as well as subtle minor and nonlinear effects. The case study is an idealized river management model representing typical conditions of the southern Murray–Darling Basin in Australia for which the sensitivity of a variety of model outcomes to variations in the driving forces, inflow to the system, rainfall and potential evapotranspiration, is examined. The model outcomes are most sensitive to the inflow to the system, but the sensitivity analysis identified minor effects of potential evapotranspiration and nonlinear interaction effects between inflow and potential evapotranspiration.

scholarly journals Hydrologic controls and anthropogenic drivers of the zebra mussel invasion of the Mississippi-Missouri river system

2011 ◽  
Vol 47 (3) ◽  
Author(s):  
L. Mari ◽  
E. Bertuzzo ◽  
R. Casagrandi ◽  
M. Gatto ◽  
S. A. Levin ◽  
...  
Keyword(s):  
Zebra Mussel ◽  
Missouri River ◽  
River System ◽  
Hydrologic Controls ◽  
Anthropogenic Drivers

scholarly journals Variation in turbidity with precipitation and flow in a regulated river system – River Göta Älv, SW Sweden

2013 ◽  
Vol 10 (1) ◽  
pp. 255-293
Author(s):  
G. Göransson ◽  
M. Larson ◽  
D. Bendz
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
Fresh Water ◽  
Surface Runoff ◽  
River System ◽  
Regulated River ◽  
Suspended Sediment Transport ◽  
Simple Relationship ◽  
Main River ◽  
Lake Vänern

Abstract. The turbidity variation in time and space is investigated in the downstream stretch of the river Göta Älv in Sweden. The river is heavily regulated and carries the discharge from the largest fresh water lake in Sweden, lake Vänern, to the outflow point in Göteborg Harbour on the Swedish west coast. The river is an important waterway and serves as fresh-water supply for 700 000 users. Turbidity is utilised as an indicator to ensure sufficient quality of the intake water to the treatment plant. The overall objective of the study was to investigate the influence of rainfall, surface runoff, and river water flow on the temporal and spatial variability of the turbidity in the regulated river system by employing statistical analysis of an extensive data set. Six-year long time series of daily mean values on precipitation, discharge, and turbidity from six stations along the river were examined primarily through linear correlation and regression analysis, combined with nonparametric tests and analysis of variance. The analyses were performed on annual, monthly, and daily basis, establishing temporal patterns and dependences, including seasonal changes, impacts from extreme events, influences from tributaries, and the spatial variation along the river. The results showed that there is no simple relationship between discharge, precipitation, and turbidity, mainly due to the complexity of the runoff process, the regulation of the river, and the effects of lake Vänern and its large catchment area. For the river Göta Älv, significant, positive correlations between turbidity, discharge, and precipitation could only be found during periods with high flow combined with heavy rainfall. Local precipitation does not seem to have any significant impact on the discharge in the main river, which is primarily governed by the precipitation at catchment scale. The discharge from the lake Vänern determines the base level for the turbidity in the river, whereas local surface runoff and tributary discharge induced by rainfall govern the temporal variability in turbidity. Autocorrelation analysis indicates a temporal persistence in turbidity of about 10 days. The results also show that erosion in the main river, from the river bed and banks, is not a dominant contributor to the suspended sediment transport in the river. Further studies on the correlation between turbidity and suspended sediment transport and in relation to erosion processes are suggested.

scholarly journals Size-Dependent Trophic Patterns of Pallid Sturgeon and Shovelnose Sturgeon in a Large River System

2013 ◽  
Vol 4 (1) ◽  
pp. 41-52 ◽  
Author(s):  
William E. French ◽  
Brian D. S. Graeb ◽  
Katie N. Bertrand ◽  
Steven R. Chipps ◽  
Robert A. Klumb
Keyword(s):  
South Dakota ◽  
Trophic Position ◽  
Fork Length ◽  
Missouri River ◽  
River System ◽  
Large River ◽  
Diet Shift ◽  
Fish Prey ◽  
Shovelnose Sturgeon ◽  
Pallid Sturgeon

Abstract This study compared patterns of δ15N and δ13C enrichment of pallid sturgeon Scaphirhynchus albus and shovelnose sturgeon S. platorynchus in the Missouri River, United States, to infer their trophic position in a large river system. We examined enrichment and energy flow for pallid sturgeon in three segments of the Missouri River (Montana/North Dakota, Nebraska/South Dakota, and Nebraska/Iowa) and made comparisons between species in the two downstream segments (Nebraska/South Dakota and Nebraska/Iowa). Patterns in isotopic composition for pallid sturgeon were consistent with gut content analyses indicating an ontogenetic diet shift from invertebrates to fish prey at sizes of >500-mm fork length (FL) in all three segments of the Missouri River. Isotopic patterns revealed shovelnose sturgeon did not experience an ontogenetic shift in diet and used similar prey resources as small (<500-mm FL) pallid sturgeon in the two downstream segments. We found stable isotope analysis to be an effective tool for evaluating the trophic position of sturgeons within a large river food web.

Remedial strategy of algal proliferation in a regulated river system by integrated hydrological control: an evolutionary modelling framework

2014 ◽  
Vol 65 (5) ◽  
pp. 379 ◽  
Author(s):  
Dong-Gyun Hong ◽  
Kwang-Seuk Jeong ◽  
Dong-Kyun Kim ◽  
Gea-Jae Joo
Keyword(s):  
Chlorophyll A ◽  
Phytoplankton Biomass ◽  
River Flow ◽  
Winter Season ◽  
River System ◽  
Regulated River ◽  
Water Volume ◽  
Ample Evidence ◽  
Chlorophyll A Concentration ◽  
Rule Set

We simulated water-quality measures in a regulated river system (the lower Nakdong River) under simultaneous discharge control at upriver dams and an estuarine barrage with the goal of reducing phytoplankton biomass (chlorophyll a concentration). We used genetic programming (GP) to create a rule-set-based predictive model for the chlorophyll a concentration based on 16 years (1994–2009) of meteorological, hydrological, and limnological data. The rule-set model used eight variables, including water temperature, dam and estuarine barrage discharge, phosphate and silica concentrations, and accurately predicted the phytoplankton biomass (determination coefficients, r2, for training and test data were 0.52 and 0.45, respectively). According to sensitivity and scenario analyses, a larger water volume resulting from increased discharge from upriver dams and decreased discharge from an estuarine barrage would reduce chlorophyll a concentrations at the study site. This result provided ample evidence that simultaneous manipulation of dam and estuarine discharge rates could effectively increase river flow and flush aggregated algal populations downstream. Additionally, we considered that even small increases in river flow could play a role in diluting phytoplankton biomass during the dry winter season when estuarine discharge remains low. These two hydrological mechanisms could be used as selective strategies for water-resource management.

Migration patterns and estuarine aggregations of a catadromous fish, Australian bass (Percalates novemaculeata) in a regulated river system

2017 ◽  
Vol 68 (8) ◽  
pp. 1544 ◽  
Author(s):  
D. J. Harding ◽  
R. G. Dwyer ◽  
T. M. Mullins ◽  
M. J. Kennard ◽  
R. D. Pillans ◽  
...  
Keyword(s):  
Fish Species ◽  
Large Scale ◽  
River System ◽  
Regulated River ◽  
Regulated Rivers ◽  
Migration Patterns ◽  
Migratory Response ◽  
Resource Managers ◽  
Receiver Array ◽  
Downstream Movement

Catadromous fish species require adequate flows to migrate between fresh and saltwater habitats to reproduce. However, artificial barriers and flow alteration affect fish populations by reducing habitat connectivity and disrupting movement cues. In regulated rivers, it is critical that migratory flow requirements are quantified to optimise water allocation for multiple users. In the present study, we assessed the migratory timing, flow and estuarine aggregation requirements for Australian bass (Percalates novemaculeata). Over 2 years, 66 bass were tracked using an acoustic receiver array in the Logan River (Qld, Australia). Bass performed large-scale downstream movements in response to elevated winter flows (40 and 108m3 s–1), which facilitated migration to the lower estuary, where salinity conditions were appropriate for spawning. Bass migrations occurred only when gonads were mature, despite large flows providing opportunities for movement outside this period. Experimental flow releases from an impoundment (2.1m3 s–1) during winter did not elicit a migratory response. Connectivity between upstream and estuarine habitats was reduced by the presence of instream weirs, with downstream movement across weirs occurring only when sufficient flow magnitude was achieved (>76.1m3 s–1). These findings are relevant for water resource managers formulating environmental flow rules for catadromous fish species in systems with multiple instream artificial barriers.

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