Porosity is one of the key properties fluvial sediments. It defined as ratio pore volume to total volume. In river science, porosity often assumed be spatially constant, which might a gross simplification reality. Ignoring spatial variations in can cause errors morphological, ecological, hydrological, hydrogeological and sedimentological applications. Although detailed information about obtaine...

The source dynamics of total and dissolved material in riverine systems are being affected by anthropogenic activities resulting the degradation waterways worldwide. Identifying main sources is thus central to management increasingly scarce water resources. Here, we utilize data generated from quality monitoring programs investigate a large, semi-arid basin western Canada. Our research focuses ...

The traditional method of hydrology and water conservancy calculation is based on the assumption natural runoff, while applicability has weakened in urbanization-affected river basins. paper carried out research hydrological model flood control middle lower reaches Chuhe River under background urbanization. On basis analysis characteristics basins, framework constructed, which includes five mod...

Abstract The extent to which flows mix at confluences is pivotal for determining spatial patterns of water quality and biodiversity. Because mixing processes are complex, predicting rates characteristic scales difficult. Here we introduce a theory confluence dynamics shallow in the process controlled by switching between two modes behaviour—one similar wake behind an obstacle other layer parall...

Understanding how environmental gradients shape the spatial patterns of intraspecific genetic diversity is a central issue in ecological and evolutionary sciences. In riverine ecosystems, there generally an increase neutral downstream, as well differentiation among upstream populations. However, selective pressures may vary markedly along upstream–downstream gradient, which could modify these p...

Using a simple conceptual dynamic river water quality model, the effects of different basin-wide water quality management options on downstream water quality improvements in a semi-arid river, the Crocodile River (South Africa) were investigated. When a river is impacted by high rates of freshwater withdrawal (in its upstream reaches), and receives polluted side-stream inflows and wastewater ef...

Enhanced understanding of flow structure at a river confluence is essential for predictions sediment transport and morphological evolution. To date, however, the confluent reservoir tributary carrying high loads has remained poorly understood, may be vertically layered sharply, featuring subaqueous sediment-laden flow, i.e., turbidity currents underneath subaerial clear water. Here recently est...