Modelling of suspended sediment in a weir reach using EFDC model

Abstract

Construction of hydraulic structures often leads to alteration of river dynamics and water quality. Suspended solids entering the upstream of the weir cause adverse effects to the hydroecological system and, therefore, it is necessary to build a modelling system to predict the changes in the river characteristics for proper water quality management. In this study, the discharges and total suspended solids upstream and downstream of the Baekje Weir installed in Geum River, Korea, was modelled using the environmental fluid dynamics code (EFDC) model. The resulting trend of four rainfall events shows that as rainfall increases, the total suspended solids (TSS) concentration increases as well. For the two larger events, at the upstream of the weir, TSS was observed to decrease or remain constant after the rainfall event depending on the lowering of the open gate. At the downstream, TSS supply was controlled by the weir during and after the rainfall event resulting in decline in the TSS concentration. The modelling produced good results for discharge based on %Diff. (4.37-6.35), Nash-Sutcliffe efficiency (NSE) (0.94-0.99) and correlation coefficient (r) (0.97-0.99) values as well as for TSS with acceptable values for %Diff. (12.08-14.11), NSE (0.75-0.81) and r (0.88-0.91), suggesting good applicability of the model for the weir reach of the river in the study site.

Short‐Term Environmental Flow Assessment of a Functional Estuarine Tidal Flat Ecosystem: A Nonlinear Ecological Response to Flow Alteration

“…Environmental Fluid Dynamics Code (EFDC) was applied to simulate the hydrodynamic and sediment transport in the YRE (the structure of the model is shown in Text S1, in the supporting information). EFDC was developed by the Virginia Institute of Marine Science and has been verified and used successfully in hydrodynamic and sediment simulations of rivers and estuaries (Chen et al, 2016; James et al, 2010; Pak et al, 2015; Seo et al, 2010; Shin et al, 2019; Xie et al, 2010). The model adopted in this study is a 2‐D depth‐averaged model.…”

Groundwater Level Forecasting Using Machine Learning: A Case Study of the Baekje Weir in Four Major Rivers Project, South Korea

“…(S. Kim et al, 2019) documented frequent occurrences of cyanobacterial blooms following the Baekje weir construction, highlighting concerns about water usage and aquatic ecosystem health. Likewise, S. Kim et al (2019) measured changes in chemical water quality, observing frequent surface algal blooms dominated by buoyant cyanobacteria post-construction, and (Pak et al, 2016) documented alterations to river dynamics and water quality, such as effects of suspended solids entering upstream of the weir on the hydroecological system. Effects of Baekje weir construction on chemical water quality, physical habitat, and biological integrity of fish in the Geum River were documented by Lee and An (2019).…”

On the sediment deposition on Barugbug Situdam Weir

“…It coincides with the end of the first and third planting seasons of the irrigation scheme in the study area of Kulonprogo district, Indonesia. [5][6] [7] This research aims to understand the process of sedimentation from dissolved sediment material through measurement data of three parameters namely TSS, rainfall and water depth obtained for more than two years in the case of Barugbug weir (See Figure 1). To understand the mechanism of sedimentation, we use a simple advection-diffusion model that takes into account the settling velocity of dissolved sediment material.…”