Comparative uranium-thorium and thermoluminescence dating of weathered Quaternary alluvium in the tropics of Northern Australia
The AA. briefly review the TL dating of alluvium and the U/Th dating of pedogenic calcite, iron, and manganese deposits and they report on the application of both techniques to the weathered alluvium of the lower Gilbert River in northern Queensland.
Alluvium thickness and stream order relationships in Wadi Al-Khanagah basin, central Saudi Arabia
Alluvium ; Arid lands ; Catchment area;Watershed ; Drainage network ; Model ; Saudi Arabia ; Water resources
The A. examines the relationships between stream order and alluvium thickness in Wadi Al-Khanagah basin in an attempt to derive a regression model for predicting alluvium thickness in the uninhabited wadis in the shield area of Al-Quwayiyah region
Residence time of alluvium in an aggrading fluvial system
Alluvium ; Floodplain ; Fluvial terrace ; Holocene ; New Zealand ; North Island ; Pleistocene ; Sediment transport ; Stream ; Suspended load
Relationships between the surface area and age of alluvial deposits were used to estimate the residence time of alluvium in the 2205 km2 Waipaoa River basin, New Zealand. These deposits comprise terrace remnants isolated by downcutting, and Holocene
to Recent sediments that are potentially remobilizable by the modern river. Even though the amount of storage is small relative to downstream transport, the majority of the potentially remobilizable alluvium is likely to remain in storage for >100 yr
Impact of mediaeval agriculture on the alluvium in the San River headwaters (Polish Eastern Carpathians)
Agricultural land use ; Alluvium ; Archaeology ; C 14 dating ; Carpathian Mountains ; Deforestation ; Holocene ; Land use ; Poland ; Soil erosion ; Watershed
An abrupt change in sedimentary processes occurs in the alluvium of the San River headwaters in the Biedzczady mountains, Polish Eastern Carpathians. The spatial distribution of the fine-grained alluvium, the wood debris composition and radiocarbon
Modern alluvial pollen varies with geomorphic setting and depositional facies in sediments of the Yellow, Hutuo, and Luan rivers and in Baiyangdian and Hengshuihu lakes. Alluvium dominated by Pinus pollen and Selaginella spores was deposited during
a flood. In reconstructing the ancient vegetation and past climate based on pollen in alluvium, it is important to consider sedimentary facies and geomorphologic setting.
Provenance of fine-grained alluvium and late Holocene land-use change in the Tyne basin, northern England
Chemical analyses of fine-grained post-glacial alluvium in the middle Tyne valley has revealed marked contrasts in the geochemical characteristics of late Holocene floodplain and channel sediments. Using multivariate statistical techniques
, contemporary channel sediments, tills and pre-mining age alluvium from sites throughout the Tyne basin are compared and the results show that geochemical variability is diagnostic of sediment provenance from geologically distinct sub-catchments of the basin.
Matraalji pliocén-pleisztocén hegylabfelszini hordalékosszlet kronologiai tagolasa. (Chronological divisions in the alluvium on the Pliocene-Pleistocene pediment of the Matraalja)
In river channels of NW Crimean Mountains the petrographic composition of alluvium is in close connection with the geology of the area. When a river crosses a zone of a certain solid rock the percentage of those rocks gravel noticeably increases
. Another controlling factor is the rock resistance - debris of less resistant rocks (marl, clay bolls) are weared out within a few kilometres and form suspended component of alluvium. Only gravels of most resistant rocks - Upper Jurassic limestones - caome
all the way from the river head and its content reaches 80 to 90% of the total alluvium volume near the mouth. - (L'Ed.).
Time and the persistence of alluvium : river engineering, fluvial geomorphology, and mining sediment in California
Alluvium ; California ; Carrying capacity ; Channel geometry ; Flood ; Gold ; Hydrosystem ; Impact ; Mining activity ; Nineteenth Century ; River management ; Stream ; Twentieth Century ; United States of America