The central role of valley and channel width across disciplines highlights Per unit channel width (Harbor, 1998 Magilligan et al., 2015). Particularly, many landscape evolution and hydrological modelsĪpproximate the local erosion rate as a function of the channel stream power Stress exerted by the flowing water, sediment transport capacity, andĮrosion rate (Whittaker et al., 2007b Yanites et al.,Ģ010). Width is a key component in landscape evolution for its control on the shear Marcotte et al., 2021) and tectonic variations (Giaconia et al., 2012). (e.g., Dury, 1964 Hancock and Anderson, 2002 To elucidate drainage evolution over geological timescalesĪnd Ethridge, 1994) and for inferring past climate changes Measures of valley morphology, including depth and fill thickness, is used Valley width, which subsumes channels, terraces, and floodplains, and other Valley and channel width further plays a central role in landscape evolutionĢ007 Fisher et al., 2013 Hancock and Anderson, 2002). (e.g., Lóczy et al., 2009 Mashael Al, 2010 Sampson et al., 2015) to riverĮcosystems, river habitats (e.g., Beeson etĪl., 2018 Brussock et al., 1985 May et al., 2013 Sweeney et al., 2004),Īnd hydrological modeling (e.g., Looper et al., 2012). The width of channels and their hosting valleys controls river dynamics andįunctionality with far-reaching implications across a wide range of Accountingįor reorganization-specific scaling can improve estimations of erosion rate Our findings demonstrate that valley width–area scaling is a potential toolįor identifying landscapes influenced by drainage reorganization. That promotes ongoing divide migration and reorganization. Reversed and beheaded channels, potentially leading to a “width feedback” Thisĭifference results in a step change in the unit stream power between the Wider formative flows of the beheaded valley across the divide. Of formative flows in the reversed valley, which contrasts with the meaningfully The adjusted narrow channel dictates the width Hypothesized, the channel width adjusts faster to post-reorganizationĭrainage area distribution. Narrows downstream, whereas the channel widens, suggesting that, as Negative and overall similar values for b and c.Ī detailed study in one reversed valley section shows that the valley In the reversed category, weĪlso explored the independent effect of channel slope ( S) through the
Valley narrowing with increasing drainage area. Valleys, in contrast, are characterized by negative d exponents, indicating Valleys relative to undisturbed valleys but remain positive. The values of the drainage area exponents, d, are lower in the beheaded Scaling, we studied 12 valley sections in the Negev desert, Israel,Ĭategorized into undisturbed, beheaded, and reversed valleys. To explore the effect of reorganization on valley width–drainage area Is expected to deviate from that of drainages that did not experience Therefore, the valley width–area scaling in reorganized drainages In valleys than in channels due to a longer adjustment timescale for Such disproportionality may be more distinguished That experience drainage reorganization, abrupt changes in drainage areaĭistribution can result in valley or channel widths that are disproportional Width of valleys and/or channels ( W) is estimated as a power-law function of The width of valleys and channels affects the hydrology, ecology,Īnd geomorphic functionality of drainage networks.
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