Gravel-bed river floodplains in mountain landscapes disproportionately concentrate diverse habitats, nutrient cycling, productivity of biota, and species interactions. Although stream ecologists know that river channel and floodplain habitats used by aquatic organisms are maintained by hydrologic regimes that mobilize gravel-bed sediments, terrestrial ecologists have largely been unaware of the...

Laboratory studies were conducted to investigate scrap-tire-shreds as a potential alternative to conventional gravel in the drainage layer of leachate collection system at the base of landfill. Performance of various physico-chemical characteristics of leachate after passing it through combined bed of scrap-tire-shreds and gravel for different combinations of thickness of scrap-tireshreds and g...

Domestic wells in North America and elsewhere are typically constructed at relatively shallow depths and with the sand or gravel pack extending far above the intake screen of the well (shallow well seal). The source areas of these domestic wells and the effect of an extended gravel pack on the source area are typically unknown, and few resources exist for estimating these. In this article, we u...

6 [1] Gravel-bedded channels often become incised and degraded below dams. Gravel can 7 be added to the channel to rehabilitate hydrogeomorphic conditions, including those 8 promoting salmon spawning. When implemented without increasing bed slope, gravel 9 addition at downstream riffles back floods upstream riffles. A 2-year gravel augmentation 10 project was done to test the efficacy of a new ...

0003-682X/$ see front matter 2009 Elsevier Ltd. A doi:10.1016/j.apacoust.2009.07.003 * Corresponding author. Tel.: +1 217 352 6511. E-mail address: [email protected] (G.W. Swen Experiments were performed to measure the various sound-wave propagation parameters of two kinds of gravel, a crushed limestone and a stream-formed ‘‘pea gravel”, at frequencies between 25 and 200 Hz. The apparatus w...

Fairy Circles (FCs) are barren circular patches of soil surrounded by grass species, the origin of which is poorly understood. FCs feature in both the gravel plains and dune fields of the Namib Desert. While a substantial number of hypotheses to explain the origin and/or sustainability of fairy circles have been presented, none are completely consistent with either their properties or distribut...

Decisions about flood protection and river rehabilitation require prediction of the consequences of each possible management alternative. To provide such predictions, an integrative model is required that represents the cause-effect relations between revitalisation measures and morphologic, hydraulic and ecological consequences. This paper describes the hydraulics submodel of such an integrativ...

This study analyzed the effect of lightweight aggregates made fly ash from sewage-sludge thermal treatment (FASSTT LWA) on effectiveness phosphorus removal wastewater in vertical constructed wetlands (CWs), depending FASSTT LWA content CW filling and hydraulic loading rate. It was performed over 13 weeks using 15 lysimeters prepared as double-layer systems. An upper layer above gravel with diff...

The 2003 flood of the Muda River reached 1,340 m3 /s at Ladang Victoria and adversely impacted 45,000 people in Malaysia. A flood control remediation plan proposed a levee height based on a 50-year discharge of 1 ,815 m3 /s obtained from hydrologic models. This design discharge falls outside the 95% confidence intervals of the flood frequency analysis based on field measurements. Instream sand ...