Sediment

The sediments in the intertidal zone are predominantly composed of silt and clay that display substantial distribution in grain size distribution due to hydrodynamic and vegetation cover changes, such as grass, mangroves and other plantations. Sediment pH, total Corg (%) and percentages of sand, silt and clay obtained from the samples of 13 sampling stations are summarized in Table 2, whilst sediment pH was in a narrow alkaline range of 7.2 to 8.6. Similarly, Corg varied little from 0.47 to 0.91

significance of fine-grained sediment fluxes in fluvial systems continues to underscore the need for reliable information on the principal sources. Traditional monitoring techniques are unable to solve the source estimation alone and had many spatial and temporal limits, but sediment source fingerprinting method has emerged as a potentially valuable supplement to address these issues. Despite the rapidly increasing numbers of studies reporting that the use of sediment source fingerprinting method

Sediments are formed from fine-grained waste material due to erosion from the mine site. It often contains dissolved metals as a result of the mining processes containing some toxic constituents such as lead and high levels of mercury. During severe storm events and high snowmelt periods, erosion transports a significant amount of sediments and chemicals pollutants into locals streams. Dissolved metals often settle under the stream bed and cause decreases in macroinvertebrate and benthic invertebrate

Sediment samples were taken from 14 stations during the cruise program organized by the Persian Gulf and Oman Sea Ecological Research Institute (PGOSERI), Bandar Abbas, Iran in February 2014. The sediment samples were collected by Van Veen Grab sampler (Hydro-bios, Germany) and then were transferred to sterilized 50 ml tubes, and were kept refrigerated until shipboard processing later that day. The position and depth of sampling stations were recorded (Fig. 1). Selective isolation of actinomycetes

It can be argued by some geologists that significantly more time is lost at bedding planes than is recorded by the accumulation of sediment and its later lithification into a sedimentary rock. In the present paper, the continuity of the sedimentary record is investigated. It is hypothesized that sedimentary strata preserved predominately records episodic sedimentation events and gaps represented by bedding planes symbolize more time than the preserved strata. The incompleteness of the geologic record

water, wind, or other natural processes. The sediment was picked up by the glaciers and slowly eroded down towards Cape Cod. As the glaciers moved south, the warmer weather began to melt the glaciers and they dumped their load of sediment to form Cape Cod. In total, 3 glaciers formed Cape Cod. The middle lobe retreated first leaving behind sediment that created the middle part of the arm (the bicep). Next the easternmost lobe retreated and the sediment it left behind created the upper part of the

Gravel bed rivers are comprised of sediment particle sizes between 2-64mm, but may also include a degree of sand as high as 50% (Bunte and Abt 2001). This wide array of particle sizes can affect the rates of erosion, deposition, and overall morphology of a river. Understanding the rate and likelihood of these processes is crucial in comprehending contemporary river environments, their behaviour and surrounding ecology. Detailed characteristics and processes of gravel bed rivers is not well understood

Heavy metal distribution in sediments around Kallur Mandli and Sagar road Industial estate Shimoga, Karnataka, India. Jayaram G. N.1, Chandrashekarappa K. N.2 and Anantha Murthy K S2 1 Dept. Of Civil Engineering, Shree Devi Institute of Technology, Kenjar, Mangalore – 574142 Email: jayaramhonnavar@gmail.com 2 Dept. of Applied geology, Kuvempu University, Shimoga, Karnataka - 577451 Abstract The present study was taken up to identify trace metals as well as to assess the extent of anthropogenic

neurotoxic, immunotoxic, and developmental effects on fish, birds, and mammals; top consumers may be at elevated risk (Weir, 2010). Methylmercury is synthesized from inorganic mercury (Hg II) by aquatic bacteria at oxic/anoxic boundaries such as sediment-water interface of lakes and rivers (Hurley JP, 1995). The degree to which an aquatic system is impacted by methylmercury contamination is a function of a number of factors, including the rate of supply of atmospherically derived Hg (II), the net

greater influence on erosion rates and sediment transport in rivers which directly affect for climate change. All these activities impact on sedimentation process of the River in different ways. Assessing these impacts comprehensively is important for more effective environmental management of the river drainage basin. The natural vegetation has been destroyed by humans and slope lands have been cultivated. Thus, erosion is extremely high, and suspended sediment load and concentration in river. The