نتایج جستجو برای: river valleys

تعداد نتایج: 87038  

Journal: :Memorias do Instituto Oswaldo Cruz 2001
V Southgate L A Tchuem Tchuenté M Sène D De Clercq A Théron J Jourdane B L Webster D Rollinson B Gryseels J Vercruysse

The construction of the Diama dam on the Senegal river, the Manantali dam on the Bafing river, Mali and the ensuing ecological changes have led to a massive outbreak of Schistosoma mansoni in Northern Senegal, associated with high intensity of infections, due to intense transmission, and the creation of new foci of S. haematobium. Data on the vectorial capacity of Biomphalaria pfeifferi from Nd...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2011
T Ty Lindberg Emily S Bernhardt Raven Bier A M Helton R Brittany Merola Avner Vengosh Richard T Di Giulio

Mountaintop mining is the dominant form of coal mining and the largest driver of land cover change in the central Appalachians. The waste rock from these surface mines is disposed of in the adjacent river valleys, leading to a burial of headwater streams and dramatic increases in salinity and trace metal concentrations immediately downstream. In this synoptic study we document the cumulative im...

2008
Karl W. Wegmann Frank J. Pazzaglia

We synthesize a new fluvial terrace chronostratigraphy of the Bidente and Musone Rivers cast within a broader European framework, which forms the basis of a terrace genesis and river incision model for the northern Apennines, Italy. Our model, supported by terrace long profiles, correlation to Po foreland sediments, 15 new radiocarbon dates, and published numeric and relative stratigraphic ages...

2004
T. F. Stepinski M. L. Collier

[1] We have developed a novel method for delineating valley networks on Mars. The valleys are inferred from digital topography by an autonomous computer algorithm as drainage networks, instead of being manually mapped from images. Individual drainage basins are precisely defined and reconstructed to restore flow continuity disrupted by craters. Drainage networks are extracted from their underly...

2018
Agnieszka Nobis Arkadiusz Nowak Kaja Rola

Riparian zones are very rich in species but subjected to strong anthropogenic changes and extremely prone to alien plant invasions, which are considered to be a serious threat to biodiversity. Our aim was to determine the spatial distribution of Chenopodium ficifolium, a species demonstrating strong confinement to large river valleys in Central Europe and an indicator of annual pioneer nitrophi...

2012
Qi Liu Peng Chen Kai He C. William Kilpatrick Shao-Ying Liu Fa-Hong Yu Xue-Long Jiang

BACKGROUND The Mountains of southwest China have complex river systems and a profoundly complex topography and are among the most important biodiversity hotspots in the world. However, only a few studies have shed light on how the mountains and river valleys promote genetic diversity. Apodemus ilex is a fine model for investigating this subject. METHODOLOGY/PRINCIPAL FINDINGS To assess the ge...

2016
Anindya Sarkar Arati Deshpande Mukherjee M. K. Bera B. Das Navin Juyal P. Morthekai R. D. Deshpande V. S. Shinde L. S. Rao

The antiquity and decline of the Bronze Age Harappan civilization in the Indus-Ghaggar-Hakra river valleys is an enigma in archaeology. Weakening of the monsoon after ~5 ka BP (and droughts throughout the Asia) is a strong contender for the Harappan collapse, although controversy exists about the synchroneity of climate change and collapse of civilization. One reason for this controversy is lac...

2010
Maryna Komar

The aim of the natural investigations carried out in two archaeological sites in the SE Poland was to determine their TL age (15 samples) and characterize the vegetation cover with the use of pollen analysis (10 samples) of loess and loess-like deposits sampled in the sites and their close environs. Micromorphological features of loess were examined in one of the sites. The research was carried...

Journal: : 2022

This paper analyzes seasonal dynamics of the Mongun-Taiga massif vegetation cover from February to October 2022 based on application NDVI index using Sentinel-2 satellite imagery data. To analyze massif, 15 points valleys five rivers were selected they are Tolaity River (south side), Holash (west Balyktyg (north Right-Mugur (north-east side) and Shara-Khoragai river (east side). The graphs diff...

Journal: : 2022

The Oka Plateau is situated in the Sayan Mountain System on West of Buriatia Republic. In Late Pleistocene, this territory was influenced by local glaciers which were developed along rivers’ valleys. . Glaciers played an important role strategy human development Plateau, for long periods time making inaccessible numerous valleys tributaries River, main water artery Plateau. Starting from end Pl...

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