While speculation on effects of dredging on seagrass beds is plentiful, actual empirical data documenting these effects are not. In this study, acoustic-based seagrass mapping techniques were used to generate detailed maps of seagrass distribution before and after dredging operations. Eelgrass (Zostera marina) within Scituate Harbor, MA, was monitored during mid-summer in 2001, 2003, and 2004; ...

Rivers in the north-western region of China have a high sediment content, and construction reservoirs on these rivers must address problem sedimentation that results loss reservoir capacity. In this study, YZD (Yazidang) was considered as typical case, to injection-type water supply Northwest China. The temporal spatial characteristics diversion project were analyzed based available 46-year dat...

The shoal area of the lower Yellow River in China is not flooded with water during dry season, so various plants can grow. When floods overflow plains flood complexity resistance increased due to flow by vegetation, which directly affects discharge beach area. drag force coefficient (CD), Manning’s roughness (n), and Darcy-Weisbach (f) are commonly used characterize vegetation force. Such studi...

A five year project was undertaken to address the salinity problem in upstream of Baleswar river. The information generated during this period have been presented paper. Previously Madhumati-Baleswar river system completely non saline throughout year. Recently fresh water flow from Madhumati through passing between Chitalmari and Nazirpur Upazila is about cease due prolonged siltation on bed. D...

The sedimentation basin is an important part of hydraulic engineering. Because the prototype size too large and not easy to analyze, Mike 21 has advantages input, conversion, analysis, demonstration data results, which are flexible convenient; however, this method been used in engineering by previous researchers. This research Yellow River Diversion Project as object, a simulation model channel...

This research explores how a circular collar with tilt angle (counterclockwise around the direction of channel cross-section) could affect local scour depth single cylindrical pier in clear-water based on Large Eddy Simulation (LES) six cases. The results show that horizontal is best for reducing depth. With increases angle, effect decreases gradually and even counterproductive at equilibrium. ...

The silting process of urban reservoirs has been occurring in many regions across the world. However, identifying main sources sediment and controlling are still unsolved problems regions, mainly developing countries such as Brazil. In this study, we identify which land use most influences siltation reservoirs, how different tributary streams contribute to two located Campo Grande, Midwestern T...

The paper aims to study the impact of clogging on pervious concrete mixes and explore a simple method calculate permeability using falling head in fabricated unit. materials used are cementitious aggregates, along with superplasticizers. OPC Grade 53 cement micro Ground Granulated Blast Furnace Slag (?GGBS). Two separate narrow aggregate gradations used: 2.36–4.75 mm 4.75–6.30 mm. water-binder ...

Abstract Dams are built to store the water flowing from upstream downstream. Sedimentation and siltation some of major problems affecting storage capacity dams. For effective management, bathymetric topographic data used assess this challenge. In Mambila Plateau Taraba, Nigeria, Tunga Dam is a multifunctional reservoir that serves as small hydropower, irrigation domestic use dam. Nonetheless, i...