A5083593831- Geology and Paleoclimatology Research
- Aeolian processes and effects
- Soil erosion and sediment transport
- Geological formations and processes
- Geochemistry and Geologic Mapping
- Remote Sensing in Agriculture
- Pleistocene-Era Hominins and Archaeology
- Remote Sensing and LiDAR Applications
- Remote Sensing and Land Use
- Geological and Geophysical Studies Worldwide
- Marine and environmental studies
- Soil Geostatistics and Mapping
- African Studies and Geopolitics
- Groundwater and Watershed Analysis
- Atmospheric aerosols and clouds
- Geomagnetism and Paleomagnetism Studies
- Forensic Anthropology and Bioarchaeology Studies
- Remote-Sensing Image Classification
- Atmospheric chemistry and aerosols
- Archaeology and ancient environmental studies
- Soil Moisture and Remote Sensing
- Climate change and permafrost
- Flood Risk Assessment and Management
- Transboundary Water Resource Management
- Archaeological and Geological Studies
University of Reading
2013-2023
University of Oxford
1990-2007
Leverhulme Trust
2007
University of Cambridge
2007
National Museum of Natural History
2007
Smithsonian Institution
2007
Karnatak University
2007
The University of Queensland
2007
Oxford Archaeology
2007
University of Sussex
2000
Evidence increasingly suggests that sub-Saharan Africa is at the center of human evolution and understanding routes dispersal “out Africa” thus becoming important. The Sahara Desert considered by many to be an obstacle these dispersals a Nile corridor route has been proposed cross it. Here we provide evidence was not effective barrier indicate how both animals humans populated it during past humid phases. Analysis zoogeography shows more crossed via this than used corridor. Furthermore,...
The Youngest Toba Tuff (YTT) eruption, which occurred in Indonesia 74,000 years ago, is one of Earth's largest known volcanic events. effect the YTT eruption on existing populations humans, and accordingly course human evolution, debated. Here we associate with archaeological assemblages at Jwalapuram, Jurreru River valley southern India. Broad continuity Middle Paleolithic technology across event suggests that hominins persisted regionally this major eruptive event.
Abstract Lacustrine sediments from southeastern Arabia reveal variations in lake level corresponding to changes the strength and duration of Indian Ocean Monsoon (IOM) summer rainfall winter cyclonic rainfall. The late glacial/Holocene transition region was characterised by development mega-linear dunes. These dunes became stabilised vegetated during early Holocene interdunal lakes formed response incursion IOM at approximately 8500 cal yr BP with C3 dominated savanna grasslands. weakened...
Abstract A technique for estimating crop coverage using linear mixture modelling of multi-temporal Advanced Very High Resolution Radiometer (AVHRR) data is presented a study area in northern Greece. This paper identifies some the problems associated with satellite sensor coarse spatial resolution estimation. Using imagery high to extrapolate ground measurements AVHRR scales, shows how model can be applied mixed agricultural system. Crop areas are estimated an average accuracy 89 percent on...
Abstract The Holocene vegetation history of the Arabian Peninsula is poorly understood, with few palaeobotanical studies to date. At Awafi, Ras al‐Khaimah, UAE, a 3.3 m lake sediment sequence records development for period 8500 cal. yr BP ∼3000 BP. δ 13 C isotope, pollen and phytolith analyses indicate that C3 Pooid grassland strong woody element existed during early (between 6000 BP) became replaced by mixed C4 grasses Panicoid tall grass between 5900 5400 An intense, arid event occurred at...
Abstract The first inventory of dust emission sources in Central Asia and northwestern China (35–50°N, 50–100°E) derived from the twice daily MODIS imagery 2003 to 2012 is presented. A high‐resolution (1 km) enhancement product was generated produce maps point (DPS), indicating geographical locations observed emissions, gridded data sets frequencies. About 13,500 DPS were detected over an area ∼5 × 10 6 km 2 , however, their distribution uneven. highest frequency occurred northern eastern...
Optical dating of two dune profiles developed in linear dunes Ras Al Khaimah, United Arab Emirates, has been used to establish the timing and rate accretion. One section at Awafi was over 17 m high, while that Idhn 40 high. The appears have accumulated very rapidly ≈10 000 years ago, with a vertical accumulation about 3·3 ka −1 . past 1000 years, 20 sediment accumulating time period 270 years. may response transgression Persian Gulf by rising sea levels late Pleistocene Holocene times....
Abstract The paper reports on the fourth (2010) season of fieldwork Cyrenaican Prehistory Project, and further results analyses artefacts organic materials collected in 2009 season. Ground-based LiDar has provided both an accurate 3D scan Haua Fteah cave information cave's morphometry or origins. excavations focussed Middle Palaeolithic Stone Age ‘Pre-Aurignacian’ layers below base Trench beside McBurney Deep Sounding (Trench D) Final ‘Oranian’ upper part M). Although referred to as more...
Abstract This paper presents a new approach to modelling flash floods in dryland catchments by integrating remote sensing and digital elevation model (DEM) data geographical information system (GIS). The spectral reflectance of channels affected recent exhibit marked increase, due the deposition fine sediments these as flood recedes. allows parts catchment that have been event be discriminated from unaffected parts, using time series Landsat images. Using images Wadi Hudain southern Egypt,...
According to the Spectral Variation Hypothesis (SVH), spectral variance has potential predict taxonomic composition in grasslands over time. However, previous studies relationship been found be unstable. We hypothesise that diversity of phenological stages is also a driver and could act confound species signal. To test this concept, intra-annual repeat botanical sampling was performed at quadrat scale two grassland sites, one displaying high other low diversity. Six metrics were used, three...
The mapping of hydrothermal alteration zones associated with epithermal gold deposits on the island Lesvos in Greece has been carried out using Landsat Thematic Mapper (TM) satellite and ground remote sensing data. initial analysis data minimum noise fraction, matched filter spectral unmixing techniques identified altered rock outcrops clearly. pixels were almost completely contained within highest grade mapped by field geologists. spectroscopy two quantitative techniques, angle mapper...
Abstract Remote sensing data and digital elevation models were utilized to extract the catchment hydrological parameters delineate storage areas for Ugandan Equatorial Lakes region. Available rainfall/discharge are integrated with these morphometric construct a model that simulates water balance of different interconnected basins enables impact potential management options be examined. The total annual discharges generally very low (less than 7% rainfall). basin shallow (5 m deep) Lake Kioga...
ABSTRACT The ASTER Global Digital Elevation Model (GDEM) has made elevation data at 30 m spatial resolution freely available, enabling reinvestigation of morphometric relationships derived from limited field using much larger sample sizes. These are used to analyse a range for dunes (between dune height, spacing, and equivalent sand thickness) in the Namib Sand Sea, which was chosen because there number extant studies that could be comparison with results. relative accuracy GDEM capturing...
Abstract Reconnaissance survey in the Murzuq area, some 150 km south-east of Jarma, was carried out as part 2011 field programme Desert Migrations Project, with separate funding from Leverhulme Trust for this element work entitled ‘Peopling Project’. This designed to provide verification details settlement systems identified and mapped high-resolution satellite images an area c . 600 2 immediately east oasis town Murzuq. Examination QuickBird Ikonos imagery has permitted identification a...
In memoriam John F. Wippel (21.VIII.1933-11.IX.2023)
Abstract The Desert Migrations Project is a new interdisciplinary and multi-dimensional collaborative project between the Society for Libyan Studies Department of Antiquities. geographical focus study Fazzan region southwest Libya in thematic terms we aim to address theme migration broadest sense, encompassing movement people, ideas/knowledge material culture into out Fazzan, along with evidence shifting climatic ecological boundaries over time. report describes principal sub-strands...
Abstract The paper reports on the third (2009) season of fieldwork Cyrenaican Prehistory Project, and further results from analysis materials collected in previous (2007 2008) fieldwork. Sediments a 14 m-deep core drilled beside McBurney trench provide an invaluable overview overall stratigraphic sequence, including at depths reached by 1950s Deep Sounding but not yet investigated present project. Sampling newly-exposed faces original excavation for dating ( C, ESR, OSL, U-series)...