Impact of gully incision on hillslope hydrology

Chen, Xing; Kumar, Mukesh; Richter, Daniel D.; Mau, Yair

doi:10.1002/hyp.13845

Cited by 7 publications

(5 citation statements)

References 57 publications

(62 reference statements)

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“…This type of partitioning constitutes the simplest form of ET breakdown and it is best known as the bucket model approach (Hao et al., 2005; Smithwick et al., 2014). In reality, characterizing partitioning is a very challenging task controlled by variables like soil hydraulic properties and root distribution (Chen et al., 2020; Shah et al., 2007). For example, thin roots with a diameter <2 mm are most often observed at the top soil layers within the vadose zone (Di et al., 2018), whereas at deeper saturated layers thicker roots are observed as a result of waterlogging potentially causing the death of thin roots due to low oxygen levels (Naumburg et al., 2005).…”

Section: Methodological Limitations and Discussionmentioning

confidence: 99%

Influence of Shallow Groundwater Evapotranspiration on Recharge Estimation Using the Water Table Fluctuation Method

Boumis

Kumar

Nimmo

et al. 2022

Water Resources Research

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Groundwater is a vital resource for both natural ecosystems and humans (Wada et al., 2014). Over 2 billion people rely on groundwater as their main freshwater resource (Famiglietti, 2014). Groundwater is also extensively used in irrigated agriculture (Siebert et al., 2010). The increased water extraction to satisfy human needs has led to groundwater depletion in many parts of the world (Aeschbach-Hertig & Gleeson, 2012;Rodell et al., 2009;Scanlon et al., 2007). Given these evolving challenges, which are expected to get worse with increasing population, assessment of groundwater recharge, that is, the amount of water that replenishes aquifers after escaping the vadose zone , is crucial for sustainable management and development of groundwater resources (Moon et al., 2004). Groundwater recharge is, however, an inherently complex process controlled by multiple factors including climate, geomorphology, vegetation characteristics and antecedent soil moisture conditions, among others (De Vries & Simmers, 2002). Several methods to obtain estimates of groundwater recharge exist, including those based on direct measurements (Flint et al., 2002) and indirect methods that often use empirical models (Reitz & Sanford, 2020), physically based land surface models (

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Section: Methodological Limitations and Discussionmentioning

confidence: 99%

Influence of Shallow Groundwater Evapotranspiration on Recharge Estimation Using the Water Table Fluctuation Method

Boumis

Kumar

Nimmo

et al. 2022

Water Resources Research

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“…This level might have been different as our simulation was calibrated using observations formed after the gully's incision. Gully incision may have lowered the groundwater levels by providing a shorter drainage path to the outlet [9,12,73]. Hence, a longer drainage path than expected before gully incision should raise the groundwater level.…”

Section: Hindcast Historic Groundwater Levelmentioning

confidence: 99%

How Can the Morphometric Characteristics and Failure Conditions of a Historic Gully Caused by Intense Rainfall Be Reconstructed?

Rault¹,

Thiéry

Aunay³

et al. 2022

Earth

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In January 1980, during exceptional cyclonic rainfall, an atypical landslide, called déboulé, rapidly generated the permanent 700 m-long gully of the Ravine de l’Eglise on an inhabited plateau in Reunion Island (Indian Ocean). Retrieving the initial conditions that led to this historical process is both challenging and necessary for understanding the mechanism of gully incision and providing pointers for improving risk mitigation in relation to this phenomenon. In this study, we reconstruct the pre- and post-failure topographies using SFM (structure from motion) applied on archive aerial photographs. Based on the comparison of these digital elevation models, we estimate the volume of material eroded to be ca. 0.63 Mm3. Groundwater level increase, part of the triggering mechanism, is hindcast in the catchment of the gully using a lumped hydrological model. This model shows that in only a fortnight the groundwater level probably rose by 36 m, which could have caused a progressive increase in pore pressure and triggered formation of the gully by retrogressive landslides. We test this hypothesis by considering the pre-failure topography and the hindcast groundwater level in a deterministic model based on limit equilibrium equations to explore ground stability. The evolution of ground stability with a rise in the water table shows that the gully may have extended in a headward direction by retrogressive landslides. This is the first quantitative reconstruction of an exceptional historical event affecting the territory of Reunion Island. The methods used to investigate the Ravine de L’Eglise incision thus offer new complementary insights and challenges for understanding the mechanism and the temporality of gully formation.

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“…The local physical effects of gully erosion on agricultural productivity can be recognized in the effects on crop extent and productivity (e.g., figure 2 in Poesen, 2018). The presence of gully networks reduces soil moisture (Chen et al, 2020; Frankl et al, 2016), and increases losses of soil, nitrogen and phosphorus (Poesen et al, 2003). Soil erosion can limit agricultural productivity in many areas where fertilization is not economic or practical (Alewell et al, 2020).…”

Section: Expanding Understanding Of Consequencesmentioning

confidence: 99%

Achieving change through gully erosion research

Wilkinson

Rutherfurd

Brooks

et al. 2023

Earth Surf Processes Landf

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This is an introduction to a special issue arising from the 8th International Conference on Gully Erosion, held in Townsville, Australia in 2019. Research has improved understanding of gully erosion processes and increasingly emphasizes sophisticated near‐and‐remotely sensed methods to characterize and measure gullies. These data can then be analysed using equally sophisticated models and scenarios can be simulated. These advances improve the capacity to predict gully initiation and development over time and space. It is often assumed that better prediction translates into greater impact and uptake of research to solve real world gully erosion problems. Examples of impressive associations between research programmes and major gully management programmes are evident. However, there has been little assessment of the impact of gully research. We argue for a greater focus on achieving impact including interventions that better manage and prevent gully erosion. Opportunities to deliver research impact are assessed using three indicators of progression towards impact; the practical usability of research, whether it is in use by non‐researchers, and whether it is useful in guiding improvements in management. Like other natural hazards, gully erosion is a phenomenon of the social, economic and environmental context in which it occurs. Defining the contexts and consequences of gully erosion and using these to frame further research is therefore a means to increase research impact. Enhancing collaboration between research disciplines and with practitioners who act on the research, and a greater focus on the translation of results into practice, is another avenue. Expanding the monitoring and evaluation of gully management can better demonstrate the impact of past research and enable further useful investigations. We urge gully erosion researchers to consider the potential impact of their research, including how it can more effectively inform better and more cost‐effective management and political decisions.

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Impact of gully incision on hillslope hydrology

Abstract: This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

Cited by 7 publications

References 57 publications

Influence of Shallow Groundwater Evapotranspiration on Recharge Estimation Using the Water Table Fluctuation Method

Influence of Shallow Groundwater Evapotranspiration on Recharge Estimation Using the Water Table Fluctuation Method

How Can the Morphometric Characteristics and Failure Conditions of a Historic Gully Caused by Intense Rainfall Be Reconstructed?

Achieving change through gully erosion research

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