Estimating soil subsidence and carbon loss in the Everglades Agricultural Area, Florida using geospatial techniques

Aich, Sumanjit; McVoy, Christopher; Dreschel, Thomas W.; Santamaria, Fabiola

doi:10.1016/j.agee.2013.03.017

Cited by 34 publications

(25 citation statements)

References 17 publications

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“…This limitation of existing pattern metrics is apparent in the ridge and slough landscape mosaic in the Everglades (Florida, USA), where a century of hydrologic intervention (flow modification through drainage, compartmentalization, and impoundment) has substantially degraded landscape pattern (SCT 2003). The striking pattern present in the historical landscape and in remnant blocks of the contemporary system consists of elongated sawgrass (Cladium jamaicense) patches (ridges) occupying elevations currently 20-30 cm higher (Watts et al 2010;McVoy et al 2011;Aich et al 2013) than the mosaic of interconnected deeper-water sloughs containing a variety of submerged (e.g., Utricularia spp., Myriphylum spicatum), floating leaved (e.g., Nymphaea odorata) and emergent vegetation (e.g., Panicum hemitomon, Eleocharis elongata). While both patch types are markedly elongated in the direction of historical water flow, it is the deeper water sloughs which stay almost continuously inundated, and which convey most (ca.…”

Section: Introductionmentioning

confidence: 98%

Linking metrics of landscape pattern to hydrological process in a lotic wetland

et al. 2015

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Context Strong reciprocal interactions exist between landscape patterns and ecological processes. In wetlands, hydrology is the dominant abiotic driver of ecological processes and both controls, and is controlled, by vegetation presence and patterning. We focus on binary patterning in the Everglades ridgeslough landscape, where longitudinally connected flow, principally in sloughs, is integral to landscape function. Patterning controls discharge competence in this lowgradient peatland, with important feedbacks on hydroperiod and thus peat accretion and patch transitions. Objectives To quantitatively predict pattern effects on hydrologic connectivity and thus hydroperiod. Methods We evaluated three pattern metrics that vary in their hydrologic specificity. (1) Landscape discharge competence considers elongation and patchtype density that capture geostatistical landscape features.(2) Directional connectivity index (DCI) extracts both flow path and direction based on graph theory. (3) Least flow cost (LFC) is based on a global spatial distance algorithm strongly analogous to landscape water routing, where ridges have higher flow cost than sloughs because of their elevation and vegetation structure. Metrics were evaluated in comparison to hydroperiod estimated using a numerically intensive hydrologic model for synthetic landscapes. Fitted relationships between metrics and hydroperiod for synthetic landscapes were extrapolated to contemporary and historical maps to explore hydroperiod trends in space and time.Results Both LFC and DCI were excellent predictors of hydroperiod and useful for diagnosing how the modern landscape has reorganized in response to modified hydrology. Conclusions Metric simplicity and performance indicates potential to provide hydrologically explicit, computationally simple, and spatially independent predictions of landscape hydrology, and thus effectively measure of restoration performance.

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Section: Introductionmentioning

confidence: 98%

Linking metrics of landscape pattern to hydrological process in a lotic wetland

et al. 2015

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“…Soil organic matter is associated with soil fertility for plant growth, soil and water quality, soil resistance to erosion and it stores at least three times more carbon than the atmosphere or in living plants (Schmidt et al 2011;Aich et al 2013;Kirkels et al 2014). When dredged sediments are transferred to upland deposits, the oxidation of organic matter begins.…”

Section: Introductionmentioning

confidence: 99%

“…Some of the functional properties that play an important role in the nature of ripening and affect the properties of the soil are the type of organic matter (Akker et al 2008;Berglund and Berglund 2011;Schmidt et al 2011;Urbanek et al 2011;Guenet et al 2012;Aich et al 2013), pH and nutrient content (Ayuke et al 2011;Knicker 2011;Leue and Lang 2012), water retention capacity (Berglund and Berglund 2011;Bolte et al 2011;Querner et al 2012), dry bulk density (van Asselen 2011), aggregate stability (Amézketa 1999;Six et al 2004;Elmholt et al 2008;Munkholm 2011;Deviren Saygın et al 2012) and load-bearing capacity (Gui et al 2011). The objective of this study is to relate these functional properties of soils formed from different types of dredged sediments after dewatering and biochemical ripening at laboratory scale.…”

Section: Introductionmentioning

confidence: 99%

Functional properties of soils formed from biochemical ripening of dredged sediments—subsidence mitigation in delta areas

et al. 2016

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Purpose In delta areas, dense networks of canals have been developed through time and have to be periodically dredged. Lowering the groundwater level in delta areas deepens the aerobic zone, leading to the oxidation of organic matter and possibly to land subsidence. The use of the dredged sediments on land can be a solution to mitigate land subsidence in delta areas. Materials and methods Five types of dredged sediments with different organic matter content and particle size distribution were dewatered for 7 days and then submitted to biochemical ripening during 141 days on a laboratorial scale with constant temperature and relative humidity. The functional properties analysed were the type and content of organic matter, pH, total C, N, P and S, dry bulk density, water retention capacity, aggregate stability and load-bearing capacity. Results and discussion After biochemical ripening, there was no significant loss in the mass of organic matter but there was an increase in the fraction of stable organic compounds, observed by an increase in oxygen-bearing compounds and a decrease in hydrocarbons during biochemical ripening. The pH was not affected by biochemical ripening, and the total C, N, P and S concentrations are high and therefore the dredged sediments can improve the quality of the land. Most volume lost during dewatering and biochemical ripening can be attributed to the loss of water. The water retention capacity of the dredged sediments changed with biochemical ripening. The soils formed from biochemical ripening have very stable aggregates, and its load-bearing capacity is enough to sustain cattle and tractors. Conclusions Most volume lost during dewatering and biochemical ripening can be attributed to the loss of water and not organic matter. Therefore, the studied dredged sediments have potential to mitigate land subsidence in delta areas when spread on land.

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“…Many other lowlands delta areas suffer from subsidence (Aich et al 2013;Hooijer et al 2012;Pronger et al 2014;Querner et al 2012;Wöppelmann et al 2013), and sediments are a natural resource that can be beneficially used to reverse the process of land subsidence, especially considering that in some areas the sediments and water flow are restrained upstream which limits the natural restoration through sediment accumulation in delta areas (Kolker et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Subsidence of organic dredged sediments in an upland deposit in Wormer- en Jisperveld: North Holland, the Netherlands

et al. 2018

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Land subsidence in low-lying peatlands can be caused by shrinkage and organic matter oxidation. When these areas have networks of ditches and canals for drainage purposes, the sediments that accumulate in the waterways can be used to reverse the process of land subsidence. The objective of this study is to understand how dredged sediments can be used to reverse the process of land subsidence by analysing the contribution of shrinkage and organic matter mineralization to the subsidence observed in an upland deposit. A deposit of dredged sediments in the Wormer-en Jisperveld-North Holland, the Netherlands-was characterized during 17 months in terms of subsidence of the sediments, subsidence of the soil underlying the deposit, geotechnical water content, organic matter content, type of organic matter and nutrients. The deposit was filled to a height of 195 cm, and after 17 months, the subsidence of the sediments was 88 cm. In addition, a subsidence of 19.5 cm of the underlying soil was observed. Subsidence could be attributed to shrinkage since no significant changes in the organic matter content and total organic carbon were observed. The type of organic matter changed in the direction of humification until winter 2014, stabilized from winter 2014 to spring 2015 and changed in the direction of mineralization after the spring of 2015. Subsidence of dredged sediments in upland deposits is caused by shrinkage during the first 17 months. The solution of spreading thinner layers of sediments over the land to decrease the subsidence rates should be explored since the pressure of the deposit on the underlying soil caused an extra subsidence of 19.5 cm.

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Estimating soil subsidence and carbon loss in the Everglades Agricultural Area, Florida using geospatial techniques

Cited by 34 publications

References 17 publications

Linking metrics of landscape pattern to hydrological process in a lotic wetland

Linking metrics of landscape pattern to hydrological process in a lotic wetland

Functional properties of soils formed from biochemical ripening of dredged sediments—subsidence mitigation in delta areas

Subsidence of organic dredged sediments in an upland deposit in Wormer- en Jisperveld: North Holland, the Netherlands

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