Development of gullies on the landscape: A model of headcut retreat resulting from plunge pool erosion

Flores-Cervantes, J. H.; Istanbulluoglu, Erkan; Bras, Rafael L.

doi:10.1029/2004jf000226

Cited by 88 publications

(88 citation statements)

References 42 publications

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“…Examples are REGEM and its adaptation TIEGEM, both used in the Annualized AGricultural Non-Point Source model (AnnAGNPS; Gordon et al, 2007;Taguas et al, 2012), CHILD (Flores-Cervantes et al, 2006;Campo-Bescós et al, 2013), or the headcut growth model by Rengers and Tucker (2014). Kirkby and Bracken (2009) presented an areal gully growth model that showed how the ratio of channel versus sidewall processes is a key determinant in its evolution.…”

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confidence: 99%

Reconstructing long-term gully dynamics in Mediterranean agricultural areas

Hayas

Vanwalleghem

Laguna

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Gully erosion is an important erosive process in Mediterranean basins. However, the long-term dynamics of gully networks and the variations in sediment production in gullies are not well known. Available studies are often conducted only over a few years, while many gully networks form, grow, and change in response to environmental and land use or management changes over a long period. In order to clarify the effect of these changes, it is important to analyse the evolution of the gully network with a high temporal resolution. This study aims at analysing gully morphodynamics over a long timescale in a large Mediterranean area in order to quantify gully erosion processes and their contribution to overall sediment dynamics.A gully network of 20 km 2 located in southwestern Spain has been analysed using a sequence of 10 aerial photographs in the period 1956-2013. The extension of the gully network both increased and decreased in the study period. Gully drainage density varied between 1.93 km km −2 in 1956, a minimum of 1.37 km km −2 in 1980, and a maximum of 5.40 km km −2 in 2013. The main controlling factor of gully activity appeared to be rainfall. Land use changes were found to have only a secondary effect. A new Monte Carlo-based approach was proposed to reconstruct gully erosion rates from orthophotos. Gully erosion rates were found to be relatively stable between 1956 and 2009, with a mean value of 11.2 t ha −1 yr −1 . In the period 2009-2011, characterized by severe winter rainfalls, this value increased significantly to 591 t ha −1 yr −1 . These results show that gully erosion rates are highly variable and that a simple interpolation between the starting and ending dates greatly underestimates gully contribution during certain years, such as, for example, between 2009 and 2011. This illustrates the importance of the methodology applied using a high temporal resolution of orthophotos.

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confidence: 99%

Reconstructing long-term gully dynamics in Mediterranean agricultural areas

Hayas

Vanwalleghem

Laguna

et al. 2017

Hydrol. Earth Syst. Sci.

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“…So what make this difference? When the failure process was analyzed in Case 1 the 'headcut' (in the adverse direction of water flow) was introduced by many researchers [Bennett et al, 2000;Flores-Cervantes et al, 2006;Wells et al, 2009;Zhu et al, 2011]. However, few studies have analyzed the mechanism of this phenomenon.…”

Section: Flow Discharge During the Failure Process Of Glacier Dammentioning

confidence: 99%

Study on the Surge Wave Induced by Glacier Avalanches and its Effects on Dam Failure Process

Chen

Cui

Chen

et al. 2017

IJECE

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In this article, experimental tests were conducted to study the characteristics of the surge wave and its effects on the failure process of a glacier dam. The results indicated that two obvious surges were monitored by pore pressure transducers (PPTs) when the blockage slid into water. The surge wave attenuated exponentially near the plunging location and then attenuated slowly when it propagated downstream. When the surge wave reached the glacier dam it climbed up along the dam and flew over. Sequential propagating surges exerting on the dam were one of the main factors causing the failure of the glacier dam. The failure mechanism of glacier dam triggered by the surge waves under different initial water supply conditions was primarily analyzed in this article.

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“…of Natural Environmental Studies, The University of Tokyo, Kashiwa, Chiba, Japan cur in bedrock rivers [5][6][7] and are an indicator of channel adjustments to local or regional perturbations [8][9][10]. The steepening of a river reach occurs as a result of a number of factors and processes including resistant lithology and differential erosion [2,11,12], transient response to base level change [13,14], change in shear stress leading to gully head propagation [15], and changes in sediment loads from tributaries [16]. Knickzones that develop along the stream thalwegs or bedrocks influence the shape and trend of the longitudinal channel profiles.…”

Section: Introductionmentioning

confidence: 99%

Knickzone Extraction Tool (KET) – A new ArcGIS toolset for automatic extraction of knickzones from a DEM based on multi-scale stream gradients

Zahra¹,

Paudel²,

Hayakawa³

et al. 2017

Open Geosciences

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Extraction of knickpoints or knickzones from a Digital Elevation Model (DEM) has gained immense significance owing to the increasing implications of knickzones on landform development. However, existing methods for knickzone extraction tend to be subjective or require timeintensive data processing. This paper describes the proposed Knickzone Extraction Tool (KET), a new rasterbased Python script deployed in the form of an ArcGIS toolset that automates the process of knickzone extraction and is both fast and more user-friendly. The KET is based on multi-scale analysis of slope gradients along a river course, where any locally steep segment (knickzone) can be extracted as an anomalously high local gradient. We also conducted a comparative analysis of the KET and other contemporary knickzone identification techniques. The relationship between knickzone distribution and its morphometric characteristics are also examined through a case study of a mountainous watershed in Japan.

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Development of gullies on the landscape: A model of headcut retreat resulting from plunge pool erosion

Cited by 88 publications

References 42 publications

Reconstructing long-term gully dynamics in Mediterranean agricultural areas

Reconstructing long-term gully dynamics in Mediterranean agricultural areas

Study on the Surge Wave Induced by Glacier Avalanches and its Effects on Dam Failure Process

Knickzone Extraction Tool (KET) – A new ArcGIS toolset for automatic extraction of knickzones from a DEM based on multi-scale stream gradients

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