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Five decades of phosphorus trends in a eutrophic lake: insights from Lake Vombsjön, SwedenNARA Subscribed
We investigated 50 years of total phosphorus trends in Lake Vombsjön, Sweden, to assess changes in phosphorus inputs, outputs, and retention, and to predict the lake’s recovery following catchment management efforts. Monitoring data collected in and around the lake are compiled and evaluated using weighted regression on time, discharge, and season to assess long-term trends at the lake’s primary inlet and outlet. The analysis...
Review: Current groundwater monitoring practices in Rwanda and recommendations for enhancing knowledge of groundwater resourcesNARA Subscribed
Although groundwater serves as the predominant source of drinking water across many rural regions and certain urban areas of Rwanda, little is known about this resource. Anthropogenic impacts, such as faecal contamination, as well as geogenic water quality problems, including elevated arsenic, fluoride, iron, and manganese, are among the issues of concern for groundwater quality in Rwanda. Long-term groundwater monitoring can...
Analytical solutions for a one-line model for shoreline changes are employed to investigate the formation of two wave-dominated river delta coastlines, along with a small-scale laboratory experiment. Since the present analytical solution can be applied only to a river delta with infinite shorelines, a new analytical solution was developed to consider the effects of lateral boundaries to the evolution of delta coastlines. It wa...
Primary ship waves generated by conventional marine vessels were investigated in the Furusund fairway located in the Stockholm archipelago, Sweden. Continuous water level measurements at two locations in the fairway were analyzed. In total, 466 such events were extracted during two months of measurements. The collected data were used to evaluate 13 existing predictive equations for drawdown height or squat. However, none of th...
A numerical model was developed to simulate the evolution of a mound placed in the offshore (i.e., outside the zone of wave breaking), exposed to varying non-breaking waves and water levels. The net sediment transport rate is assumed to be mainly dominated by bed load transport, where wave asymmetry plays an important role. The net transport over a wave cycle is expressed with reference to an equilibrium profile, which ensures...
A new parameterization for calculating the nonlinear near-bed wave orbital velocity in the shallow water was presented. The equations proposed by Isobe and Horikawa (1982) were modified in order to achieve more accurate predictions of the peak orbital velocities. Based on field data from Egmond Beach in the Netherlands, the correction coefficient and maximum skewness were determined as functions of the Ursell number. The obtai...
Modeling undertow due to random wavesNARA Subscribed
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