In a flowing stream, a riffle-pool sequence (also known as a pool-riffle sequence) develops as a stream's hydrological flow structure alternates from areas of relatively shallow to deeper water. This sequence is present only in streams carrying gravel or coarser sediments.

2021年3月2日 · Together, the Riffle-Pool-Run sequence re-shapes the landscape around it, creating meandering lines and curving paths of water to flow. These different habitats allow a great diversity of invertebrates to thrive, where there is fast or slow moving water you’ll find a different community living in each.

2011年1月13日 · These findings provide the support for a physically based, integral description of pool-riffle morphodynamics and highlight the importance of flow and sediment variability on pool-riffle self-maintenance. The morphodynamic analysis bridges the gap between observations and current theories based mainly on hydrodynamic information.

2021年1月16日 · Eleven years of monitoring channel morphology in a small forested watershed indicate that pool-riffles persist through large changes in upstream water and bedload supply and that bed architecture relief is correlated to flow magnitude. A flume experiment consisting of eight runs was conducted to examine the field case in more detail.

2023年7月27日 · Here we present a dataset on turbulent flow structure in riffle-pool sequences of a natural river. Two case studies and two field-based experiments were carried out in a side branch of the...

In this study, six types of riffle-pool structures were designed to assess hydrodynamic and riverbed morphology effects on stream habitat status. A two-dimensional ecohydraulic model was used to assess the roles of different riffle-pool designs in river habitat conditions.

2013年1月16日 · The design of the centered pool-riffle sequence followed some basic geomorphological characteristics of natural pool-riffle sequences, including narrow pools and wide riffles, a gradual pool-riffle transition, and a longitudinal spacing between riffles (or pools) of five times the stream width [Keller and Melhorn, 1978].

The bathymetrywasobtainedfromapoint-basedTriangulated Irregular Network (TIN; Figure 3). Grain size was determinedusingWolman(1954)pebblecountsconducted within each pool and riffle (Table I), supplemented by particlesizedistributionsofbedsamplestakenthroughout theRedRiverWildlifeManagementAreaforparameteriz-ing the channel roughness.

A Pool-Riffle Sequence (PRS) refers to undulations in gravel-bed rivers with deeper water pools providing habitat during low-flow periods and riffles serving as spawning grounds and food-production areas. PRS encourage hyporheic exchange and are characterized by distinct patterns of sediment sorting and roughness.

• Riffle: A riffle is a small, less significant rapid, typically with shallower water and a slightly steeper slope than adjacent parts of the river (Figure 3).