Effects of Dredging on Nitrogen and Phosphorus Storage Pat-Terns and Retention Mechanisms in Column Core Sediments in the Caohai Region of Dianchi Lake

Published: Jan. 9, 2024

Dredging is a common technique for managing eutrophication problems in waters, reducing the accumulation of pollutants by removing sediments from bottom water bodies. However, dredging can cause complex impacts on lake ecosystems, and it crucial to understand benefits mechanisms environments. In this paper, dredged undredged areas Caohai portion Dianchi Lake were studied analyze effects nitrogen-phosphorus transport conversion changes morphology content its comparing content, percentage; nitro-gen-phosphorus ratio, release contribution two areas. It was found that ratio sta-bilized nitrogen (SN) stabilized phosphorus (SP) area lower than non-dredged area; BD-P TOC contents had large turnaround at 16-20 cm position sediment main conclusions would disrupt internal equilibrium system many years, particular, have greatest effect balance forms sediment, column cores 0 16 might be newly accumulated after project. with time, distribution will gradually reach new equilibrium. addition, also significant retention efficiency stable released transformed into unstable ni-trogen forms.

Language: Английский

Optimization Design of a Winch Suction Underwater Dredging Robot Using Orthogonal Experimental Design

Journal of Marine Science and Engineering, Journal Year: 2024, Volume and Issue: 12(5), P. 741 - 741

Published: April 29, 2024

In marine engineering and water conservancy projects, dredging often occurs due to silt accumulation, which can impede the long-term development of ecosystems storage systems. To enhance efficiency performance machines, a novel type winch suction underwater robot was designed. Computational fluid dynamics software utilized establish model robot’s device conduct simulation experiments. The test results were used investigate factors influencing their impact laws. Five key factors—namely, reamer rotational speed, arrangement angle, flow rate, inlet pipe diameter, outlet diameter—were selected for consideration. By setting up various sets factor levels, significant influence different on examined. Analysis variance employed analyse orthogonal experimental design, leading identification optimal levels establishment an scheme group. verified, demonstrating 13.049% increase in 19.23% decrease power consumption sludge pump compared initial setup. program surpassed that all designs met design requirements.

Language: Английский