Monitoring Tropical Peat Swamp Deforestation and Hydrological Dynamics by ASAR and PALSAR

Hoekman, D.H.

doi:10.5772/8288

Cited by 7 publications

(7 citation statements)

References 13 publications

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“…Data with spatial coverage can complement such data‐driven approach. Among the available remote sensing options [e.g., Ozesmi and Bauer , ], synthetic aperture radar (SAR) may be particularly suitable, as it detects water under vegetation and can be used to create flood occurrence maps in densely forested wetlands [ Romshoo , ; Henderson and Lewis , ; Hoekman , ; Hidayat et al , ; Kim et al , ]. It is possible to evaluate water surface slope with Spaceborne Interferometric SAR [ Sun et al , ], but this procedure has not become common.…”

Section: Implications For Deltasmentioning

confidence: 99%

Tidal river dynamics: Implications for deltas

Hoitink

Jay

2016

Reviews of Geophysics

278

226

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Tidal rivers are a vital and little studied nexus between physical oceanography and hydrology.It is only in the last few decades that substantial research efforts have been focused on the interactions of river discharge with tidal waves and storm surges into regions beyond the limit of salinity intrusion, a realm that can extend inland hundreds of kilometers. One key phenomenon resulting from this interaction is the emergence of large fortnightly tides, which are forced long waves with amplitudes that may increase beyond the point where astronomical tides have become extinct. These can be larger than the linear tide itself at more landward locations, and they greatly influence tidal river water levels and wetland inundation. Exploration of the spectral redistribution and attenuation of tidal energy in rivers has led to new appreciation of a wide range of consequences for fluvial and coastal sedimentology, delta evolution, wetland conservation, and salinity intrusion under the influence of sea level rise and delta subsidence. Modern research aims at unifying traditional harmonic tidal analysis, nonparametric regression techniques, and the existing understanding of tidal hydrodynamics to better predict and model tidal river dynamics both in single-thread channels and in branching channel networks. In this context, this review summarizes results from field observations and modeling studies set in tidal river environments as diverse as the Amazon in Brazil, the Columbia, Fraser and Saint Lawrence in North America, the Yangtze and Pearl in China, and the Berau and Mahakam in Indonesia. A description of state-of-the-art methods for a comprehensive analysis of water levels, wave propagation, discharges, and inundation extent in tidal rivers is provided. Implications for lowland river deltas are also discussed in terms of sedimentary deposits, channel bifurcation, avulsion, and salinity intrusion, addressing contemporary research challenges.

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Section: Implications For Deltasmentioning

confidence: 99%

Tidal river dynamics: Implications for deltas

Hoitink

Jay

2016

Reviews of Geophysics

278

226

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“…Consequently, the area was largely abandoned and is currently 'unproductive' and susceptible to flooding [35]. The drainage of the peatland caused by the network of extensive channels results in peat oxidation, subsidence, and regular outbreaks of large-scale fires [13,35,36]. Seven types of land cover dominate this area (Figure 1), i.e., shrub swamp, shrub, settlement, secondary swamp forest, rice field, primary swamp forest and clearing [34].…”

Section: The Study Areamentioning

confidence: 99%

InSAR Time Series Analysis of L-Band Data for Understanding Tropical Peatland Degradation and Restoration

Zhou

Waldron

et al. 2019

Remote Sensing

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In this study, satellite radar observations are employed to reveal spatiotemporal changes in ground surface height of peatlands that have, and have not, undergone restoration in Central Kalimantan, Indonesia. Our time series analysis of 26 scenes of Advanced Land Observation Satellite-1 (ALOS-1) Phased-Array L-band Synthetic-Aperture Radar (PALSAR) images acquired between 2006 and 2010 suggests that peatland restoration was positively affected by the construction time of dams—the earlier the dam was constructed, the more significant the restoration appears. The results also suggest that the dams resulted in an increase of ground water level, which in turn stopped peat losing height. For peatland areas without restoration, the peatland continuously lost peat height by up to 7.7 cm/yr. InSAR-derived peat height changes allow the investigation of restoration effects over a wide area and can also be used to indirectly assess the relative magnitude and spatial pattern of peatland damage caused by drainage and fires. Such an assessment can provide key information for guiding future restoration activities.

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“…Radar imagery is useful for the identification, mapping, and measurement of streams, lakes, and wetlands in humid tropical areas as it is unconstrained by cloud cover (Romshoo, 2006;Henderson and Lewis, 2008;Hoekman, 2009). Most surface water features are detectable on radar imagery because of the contrast in returns between the smooth water surface and the rough land surface (Lewis, 1998).…”

Section: Introductionmentioning

confidence: 99%

Flood occurrence mapping of the middle Mahakam lowland area using satellite radar

Hidayat

Hoekman

Vissers³

et al. 2012

Hydrol. Earth Syst. Sci.

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Abstract. Floodplain lakes and peatlands in the middle Mahakam lowland area are considered as ecologically important wetland in East Kalimantan, Indonesia. However, due to a lack of data, the hydrological functioning of the region is still poorly understood. Among remote sensing techniques that can increase data availability, radar is well-suitable for the identification, mapping, and measurement of tropical wetlands, for its cloud unimpeded sensing and night and day operation. Here we aim to extract flood extent and flood occurrence information from a series of radar images of the middle Mahakam lowland area. We explore the use of Phased Array L-band Synthetic Aperture Radar (PALSAR) imagery for observing flood inundation dynamics by incorporating field water level measurements. Water level measurements were carried out along the river, in lakes and in peatlands, using pressure transducers. For validation of the open water flood occurrence map, bathymetry measurements were carried out in the main lakes. A series of PALSAR images covering the middle and lower Mahakam area in the years 2007 through 2010 were collected. A fully inundated region can be easily recognized on radar images from a dark signature. Open water flood occurrence was mapped using a threshold value taken from radar backscatter of the permanently inundated river and lakes areas. Radar backscatter intensity analysis of the vegetated floodplain area revealed consistently high backscatter values, indicating flood inundation under forest canopy. We used those values as the threshold for flood occurrence mapping in the vegetated area.

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Monitoring Tropical Peat Swamp Deforestation and Hydrological Dynamics by ASAR and PALSAR

Cited by 7 publications

References 13 publications

Tidal river dynamics: Implications for deltas

Tidal river dynamics: Implications for deltas

InSAR Time Series Analysis of L-Band Data for Understanding Tropical Peatland Degradation and Restoration

Flood occurrence mapping of the middle Mahakam lowland area using satellite radar

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