Topic
Dredging
About: Dredging is a research topic. Over the lifetime, 3300 publications have been published within this topic receiving 28325 citations.
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Patent•
21 Apr 1969
TL;DR: In this paper, a method and an approach for measuring the magnitude of the presence of air and water in the system is proposed. But, the method is not suitable for the case of air.
Abstract: IN A METHOD AND APPARATUS FOR MEASURING THE QUANTITY OF A SUSPENSION OF DREDGING SPOIL AND WATER, MEANS ARE PROVIDED TO COMPENSATE FOR THE PRESENCE OF AIR IN THE SUSPENSION. THE MEASURE COMPENSATION IS DERIVED BY TAKING PRESSURE MEASUREMENTS OF AT LEAST TWO FLOW SECTIONS IN THE SYSTEM AT WHICH THE PREVAILING PRESSURES ARE DIFFERENT.
14 citations
TL;DR: In this article, a review of the effects of waste solids on the seafloor of the ocean is presented, focusing on the most obvious geologic changes caused by these materials.
Abstract: Since about 1800, human activities have significantly altered shorelines, bottom topography, sediment characteristics, and marine life in estuarine and coastal waters. The first man-induced changes of thc ocean were restricted to nearshore waters and most were small, scattered, and primarily associated with food production or port development (Klimm 1956). Sediment deposition caused by erosion of agricultural lands resulted in extensive delta building and shoreline changes in the Persian Gulf, the Adriatic Sea, and the Mississippi Delta, to name a few examples (Davis 1956). Diking and draining of wetlands, shallow ocean areas, and lakes to form agricultural land has greatly altered shorelines in the Netherlands and England (Davis 1956). Not all wastes are placed directly in the ocean. Some are brought there by normal sediment transport processes. For example, mining is a prolific sediment producer and has also caused extensive changes in wetlands and shorelines due to downstream sediment deposition. Perhaps the best studied case is the hydraulic mining of gold in California's Sierra Nevada (Gilbert 1917). Between 1850 and 1914, 1.8 x 109 m3 of debris was mobilized by mining and erosion in the San Francisco Bay drainage system. About 1.1 x 109 m 3 was deposited in the bay system or on wetlands (Gilbert 1917). Movement and deposition of this material apparently persisted for approxi mately 50 years after cessation of mining (Smith 1965). More recently, rapid growth of coastal cities and associated industry has led to greatly incrcascd construction, demolition, and dredging, and the disposal of wastes produced from these activities has emerged as a geologic process causing significant changes in coastal areas. Because waste solids have caused the most obvious geologic changes, this review deals primarily with these materials. Effects of dissolved wastes such as nutrients have been extensively discussed elsewhere (NAS 1969, Likens 1972).
14 citations
TL;DR: In this paper, a plan of action to remediate Oslo Harbour was started in 1994 and delivered to the State Pollution Control Authority (SFT) in August 1996, along with an evaluation of environmental risks connected to the remediation work has been carried out along with the determination of the requirements for the monitoring programme during and after the work.
14 citations
Patent•
19 Dec 2012
TL;DR: In this paper, a method for determining an environmental protection dredging range based on water pollution bottom mud identification and evaluation is proposed. And the method comprises the following steps of formulating a potential pollutant list of the water bottom mud; formingulating a sampling scheme; analyzing and testing the collected sample to obtain a physical index and a chemical index of the sample; primarily identifying and evaluating the waterbottom mud; determining a position and a range of a key research area, and determining pollution research areas and key pollutants of different types.
Abstract: The invention relates to a method for determining an environmental-protection dredging range based on water pollution bottom mud identification and evaluation, and the method comprises the following steps of formulating a potential pollutant list of the water bottom mud; formulating a sampling scheme of the water bottom mud and sampling the bottom mud according to the sampling scheme; analyzing and testing the collected sample to obtain a physical index and a chemical index of the sample; primarily identifying and evaluating the water bottom mud; determining a position and a range of a key research area, and determining pollution research areas and key pollutants of different types by utilizing the spatial interpolation analysis of a geological information system; identifying and evaluating the key research area and the key pollutants in detail; and utilizing a spatial analysis module in the geological information system to overlap a determined general nitrogen severe pollution area, main phosphorus severe pollution area, heavy metal high-risk area and durable organic pollution area, so that the bottom mud environmental-protection dredging range of different pollution types can be obtained. Due to the adoption of the method, the environmental-protection dredging range of the pollution bottom mud can be precisely determined.
14 citations