Showing papers by "Sergey Chalov published in 2011"
01 Jan 2011
TL;DR: In this paper, the authors proposed a framework for fast climate-driven predictions of fluvial systems, and applied it for rivers of the northern part of the East European Plain and West Siberian Plain.
Abstract: The cold regions of North Eurasia include very sensitive fluvial systems. Rapid changes in climate are reported for these areas. The aim of this study is to propose a framework for fast climate-driven predictions of fluvial systems, and to apply it for rivers of the northern part of the East European Plain and West Siberian Plain. The general approach consists of integrating outputs from climate models into a hydrological model, and then driving a catchment and morphodynamic model using output from the hydrological model. Modelled by AOGCMs, future climate shifts are the drivers of significant changes in surface flow. Predictions of an up to 25 percent decrease in annual runoff by the middle of the 21st century enables us to forecast changes in sediment migration rates, stream energy and water-channel boundary interactions, changes in channel morphology and channel patterns shifts using corresponding physically-based equations. Whereas high dimensional models are still computationally too expensive for long-term morphological predictions, simple 1-D equations enable us to make assessments of channel system response. We tested a suit of 1-D models to estimate fluvial response to climate change for the middle of the 21st century of medium and large rivers draining the north of Russia. Comparison with regional predictions for other territories is the special task of the study.
5 citations
TL;DR: In this article, an analysis of data on the location and morphology of more than 200 wood jams has shown that their occurrence frequency and size depend mainly on river size (flow discharge), the type and morphologies of river channel, and the type of tree stand in the floodplain.
Abstract: In piedmont rivers of the Kamchatka Peninsula, wood jams play a major role in channel formation and largely determine the density distribution of juvenile fish along the river, offering them convenient habitats in areas with rapid current. It has been found that juvenile fish density in wood jams is 1.5–3 times higher than in adjoining open shoals. An analysis of data on the location and morphology of more than 200 wood jams has shown that their occurrence frequency and size depend mainly on river size (flow discharge), the type and morphology of river channel, and the type of tree stand in the floodplain.
3 citations