Topic
Ephemeral key
About: Ephemeral key is a research topic. Over the lifetime, 1311 publications have been published within this topic receiving 23469 citations.
Papers published on a yearly basis
1 / 2
Papers
TL;DR: In this article, the relationship between topographic attributes and the distribution of surface soil water content in a small bare-fallow cultivated catchment was examined and the most statistically significant regression equations describing this relationship contained the independent topographic variable aspect and the compound variable ln(A), where A,=Ab/S and A^ is the local upslope contributing area per unit width of contour line and S is the slope The index ln, a measure of soil saturation, and the product of A^ and S (A^S) were both capable of predicting
Abstract: THE relationship between topographic attributes and the distribution of surface soil water content in a small bare-fallow cultivated catchment was examined The most statistically significant regression equations describing this relationship contained the independent topographic variable aspect and the compound variable ln(A,), where A,=Ab/S and A^ is the local upslope contributing area per unit width of contour line and S is the slope The index ln(A,), a measure of soil saturation, and the product of A^ and S (A^S), a measure of the erosive power of concentrated surface runoff, were both capable of predicting the location of ephemeral gullies in certain parts of the catchment However, combining them produced even better predictions throughout the catchment Ephemeral gully locations were predicted in areas where the topographic indice ln(Ab/S) was greater than 68 and A^S was greater than 18 These results demonstrate that topographic nonuniformity within small catchments is a major factor controlling the spatial variability of soil water and the location and development of ephemeral gullies
420 citations
Book•
1 Jan 2002
TL;DR: In this article, an overview of dryland river characteristics and concepts is presented. But the authors do not discuss the relationship between alluvial fans and fan channels with Mediterranean mountain fluvial systems.
Abstract: Part I An Overview of Dryland Rivers Dryland River Characteristics and Concepts (L.J. Bull and M.J. Kirkby) A Global Perspective on Dryland Rivers: Perceptions, Misconceptions and Distinctions (G.C. Nanson et al) Part II Process in Dryland Catchments Runoff Generation in Semi--Arid Areas (K. Beven) Sediment Dynamics of Ephemeral Channels (I. Reid) Modelling Event--Based Fluxes in Ephemeral Streams (J. Shannon et al) Morpho--Dynamics of Ephemeral Streams (J. Hooke and J. Mant) The Relationship between Alluvial Fans and Fan Channels with Mediterranean Mountain Fluvial Systems (A.M. Harvey) Part III Channel Network Expansion Gully Erosion in Dryland Environments (J. Poesen et al) Channel Heads and Channel Extension (L.J. Bull and M.J. Kirkby) Badland Systems in the Mediterranean (F. Gallart et al) Part IV Flooding in Ephemeral Channels Floods: Magnitude and Frequency in Ephemeral Streams of the Spanish Mediterranean Region (F. Lopez--Bermudez et al) Synoptic Conditions Producing Extreme Rainfall Events along the Mediterranean Coast of the Iberian Peninsula (F. Alonso--Sarria et al) Index
401 citations
TL;DR: The Trentishoe Formation (Hangman Sandstone Group, Middle Devonian) of North Devon consists of laterally extensive beds of parallel-laminated, fine-grained red sandstones that build multistorey sand bodies as mentioned in this paper.
303 citations
TL;DR: In this article, the authors summarize the available information on the initiation and location of (ephemeral) gullies, focusing on the relationship between the upslope drainage area ( A ) and the critical slope gradient ( S cr ) for ephemeral gully initiation.
296 citations
TL;DR: In this article, three types of sequence representing proximal, medial and distal areas on an extensive alluvial plain are found, representing the downslope progression from a low sinuosity channel network which passed into an ephemeral flood deposit complex which in turn drained into clay playas.
Abstract: Sediments in the Trentishoe Formation of the Middle Devonian Hangman Sandstone Group (North Devon, U.K.) provide the basis of a model for sandy ephemeral stream and clay playa deposition. Three types of sequence are found, representing proximal, medial and distal areas on an extensive alluvial plain. The Proximal sequence consists of cross-cutting channel-fill sandstones which represent the deposits of a network of low sinuosity sand bed streams. The Medial sequence comprises upwards coarsening cyclothems which start with relatively distal, thinly bedded sandstone and siltstone flood sheets cut by complexes of silt draped channel-fill sandstones and single channel fill sandstones. The flood sheets coarsen and thicken upwards to more proximal multistorey sheet sandstones. The Distal sequences consist of laminated mudstone and sandstone, cut by desiccation and water escape features, alternating with wave rippled sandstones, and represent playa lakes occasionally incised by high sinuosity channels with laterally accreting sandstones. The three sequence types represent the downslope progression from a low sinuosity channel network which passed into an ephemeral flood deposit complex which in turn drained into clay playas.
285 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2026 | 3 |
| 2025 | 195 |
| 2024 | 276 |
| 2023 | 370 |
| 2022 | 525 |
| 2021 | 96 |