Impact of morphological parameters on water quality variables of a regulated lowland river

Abstract

An efficient method to investigate which morphological changes have greatest impact on the water quality is to carry out a computer modelling exercise. In this study, three models, a hydrodynamic (DYNHYD), a eutrophication model (EUTRO), and a sediment and micro-pollutant transport model (TOXI), were coupled together in the High Level Architecture (HLA) platform. DYNHYD dynamically simulates the propagation of a wave through a river reach one-dimensionally by solving the full dynamic wave equation. Important parameters that describe the river morphology are the roughness coefficient and the weir discharge coefficient. EUTRO simulates the phytoplankton-nutrient dynamics in water bodies with variables and parameters that regulate the process in this cycle. Examples of some of the more important parameters are the oxygen reaeration, phytoplankton growth or nitrification rates. TOXI was implemented to simulate the transport of sediments and heavy metals in which the most important transformation process of the metals was sorption. It is the aim of this study to see the effect that hydrodynamic parameters such as weir discharge and roughness coefficients have on water quality constituents, such as chlorophyll-a, dissolved oxygen and levels of ammonium and dissolved zinc.

Quantifying Spatial Changes in the Structure of Water Quality Constituents in a Large Prairie River within Two Frameworks of a Water Quality Model

“…The uncertainty in water quality variable is described here using the coefficient of variation defined as the ratio of the standard deviation to the mean [48]. In Figure 3, a comparison is made between the water quality variables distributions at two locations (1) in uSSR at Leader and (2) lSSR at Clarkboro Ferry in winter and summer.…”

Ecosystem Services and River Basin Ecohydrology

“…Energy crop production can interfere with such goals of nature conservation as biodiversity maintenance (Rode et al 2005 ;Lupp et al 2011 ). severe impacts on various ecosystem services (or their potentials -pillar 2) due to its effects on groundwater, soils, biodiversity and the overall appearance of the landscape.…”

“…Furthermore 1D hydraulic modelling is well accepted in science and engineering (Lindenschmidt et al 2005;Buttner et al 2006;Rode et al 2007). Furthermore 1D hydraulic modelling is well accepted in science and engineering (Lindenschmidt et al 2005;Buttner et al 2006;Rode et al 2007).…”

Benthic diatom communities and a comparative seasonal-based ecological quality assessment of a transboundary river in Bangladesh

“…This seasonality plays an important role in the quantitative and qualitative assessment of physicochemical parameters and aquatic organisms [ 1 ]. Seasonality also has an essential role in altering river flow in tropical rivers, thus restructuring channel morphology, which can impact water quality [ 2 , 3 ]. In addition, changes in channel morphology can affect the interaction of the benthic community.…”