Closed depressions in karst areas

Sauro, Ugo

doi:10.1016/b978-0-12-814124-3.00032-7

Cited by 14 publications

(28 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The overall positive feedback that drives initial basin expansion involves many more mechanisms than the classic karstification feedback between flow concentration and weathering rate (Sauro, ). These mechanisms are closely mediated by hydrological processes through their effect on vegetation growth and weathering.…”

Section: Discussionmentioning

confidence: 99%

“…Biogenic CO 2 can accelerate chemical weathering by up to ~20 times (Dong et al, ). Regardless of the source of acidity and the rate of weathering, cavities enlarge and coalesce and become hydraulically interconnected, forming sinkholes, conduits, and other preferential flowpaths that further entrain flow, creating a runaway positive feedback that expands features as long as drainage from weathering sites is relatively unrestricted (Sauro, ). This fundamental karstification feedback is reflected in the high connectivity and fractal shape of many subsurface karst features, whose sizes often follow power‐law distributions (Maramathas and Boudouvis, ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ecohydrologic feedbacks controlling sizes of cypress wetlands in a patterned karst landscape

Dong

Murray

Heffernan

2019

Earth Surf Processes Landf

View full text Add to dashboard Cite

Many landforms on Earth are profoundly influenced by biota. In particular, biota play a significant role in creating karst biogeomorphology, through biogenic CO2 accelerating calcite weathering. In this study, we explore the ecohydrologic feedback mechanisms that have created isolated depressional wetlands on exposed limestone bedrock in South Florida – Big Cypress National Preserve –as a case study for karst biogeomorphic processes giving rise to regularly patterned landscapes. Specifically, we are interested in: (1) whether cypress depressions on the landscape have reached (or will reach) equilibrium size; (2) if so, what feedback mechanisms stabilize the size of depressions; and (3) what distal interactions among depressions give rise to the even distribution of depressions in the landscape. We hypothesize three feedback mechanisms controlling the evolution of depressions and build a numerical model to evaluate the relative importance of each mechanism. We show that a soil cover feedback (i.e. a smaller fraction of CO2 reaches the bedrock surface for weathering as soil cover thickens) is the major feedback stabilizing depressions, followed by a biomass feedback (i.e. inhibited biomass growth with deepening standing water and extended inundation period as depressions expand in volume). Strong local positive feedback between the volume of depressions and rate of volume expansion and distal negative feedback between depressions competing for water likely lead to the regular patterning at the landscape scale. The individual depressions, however, are not yet in steady state but would be in ~0.2–0.4 million years. This represents the first study to demonstrate the decoupling of landscape‐scale self‐organization and the self‐organization of its constituent agents. © 2018 John Wiley & Sons, Ltd.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ecohydrologic feedbacks controlling sizes of cypress wetlands in a patterned karst landscape

Dong

Murray

Heffernan

2019

Earth Surf Processes Landf

View full text Add to dashboard Cite

show abstract

“…This situation results from hydrological properties of the two groups. Since karst depression is a hydrological form (Sauro, 2012) and each depression has its own catchment area (drainage basin) (Gunn, 1981;Ford and Williams, 2007). Thus, closed-solution depressions have the same function in karst landscapes as valley depressions in fluvial landscapes (Williams, 1972;Gutiérrez et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…The bottoms of these valleys are covered with elongated depressions and conical, residual hills (Monod et al, 2006;Ford and Williams, 2007;Radulović, 2013). The depressions form the most important connections between surface and underground drainage systems (Sauro, 2012). Besides, underground channels and speleological objects can be present under dry valleys (Bočić, 2003).…”

Section: Introductionmentioning

confidence: 99%

Relict drainage effects on distribution and morphometry of karst depressions: a casestudy from central Taurus (Turkey)

Şener¹,

Öztürk²

2019

JCKS

View full text Add to dashboard Cite

Karst depressions and relict valleys, formed as a result of the combination of karst and fluvial processes, are characteristic landforms of the Taurus karst region in Turkey. Development of these two landforms is interrelated, and the main aim of this study is to explain the role of paleovalley networks on morphometric properties of the depressions. For this purpose, in this study, spatial distribution of karst depressions and relict valleys, and morphometric properties of depressions are investigated on the Ermenek Plateau based on 1:25,000-scaled, topographic maps. About 10,000 karst depressions are mapped, 49.5 % and 50.5 % of them being located in and out of relict valleys, respectively. According to morphometric calculations, there are significant differences in dimensional properties of the two groups of depressions. Mean area, perimeter, short and long axes of relict valley depressions are 2.6, 1.6, 1.6 and 1.4 times larger, respectively, than plateau depressions. Relict valley depressions and plateau depressions are elliptical-and circular-shaped, respectively. Relict valley density has positive effect, while non-relict valley density has negative effect (limiting factor) on spatial distribution of depression density.

show abstract

“…12). Based on their size and shape, they can be classified as dolines (Ćalić, 2011;Sauro, 2012;Kranjc, 2013).…”

Section: Accessibility By Sea Of Ancient Osor: Geomor Phology Bathymmentioning

confidence: 99%

Geoarchaeological evaluation of the Roman topography and accessibility by sea of ancient Osor (Cres Island, Croatia)

Draganits

Gier

Doneus

et al. 2019

Austrian Journal of Earth Sciences

View full text Add to dashboard Cite

We combine geoarchaeological investigations with high-resolution airborne laser scanning (ALS) topographic and airborne laser bathymetric (ALB) measurements to reassess the topography of the Roman city of Apsorus (modern Osor, northeastern Adriatic Sea, Croatia), which has generally been interpreted as important nodal point of Roman maritime traffic. Apsorus is located at the isthmus connecting Cres and Lošinj islands, which is 90 m wide at the narrowest part and dissected by a canal of supposed Roman age. A conspicuous low-lying wetland north of the city has been suggested to be a former sea passage and harbour area. Geoarchaeological coring, sedimentological analysis and radiocarbon dating suggest that this depression was already silted up with terrestrial sediments some 6,000 years ago and, especially in combination with the lower sea-level at that time, could not have been a Roman harbour. The combination of the ALS/ALB topographic data with lower sea-levels reconstructed for the Roman period challenges the traditional view which places ancient Osor on a small island and allows for new interpretations of the accessibility of Osor by sea.

show abstract

Closed depressions in karst areas

Cited by 14 publications

References 3 publications

Ecohydrologic feedbacks controlling sizes of cypress wetlands in a patterned karst landscape

Ecohydrologic feedbacks controlling sizes of cypress wetlands in a patterned karst landscape

Relict drainage effects on distribution and morphometry of karst depressions: a casestudy from central Taurus (Turkey)

Geoarchaeological evaluation of the Roman topography and accessibility by sea of ancient Osor (Cres Island, Croatia)

Contact Info

Product

Resources

About