The Juksan weir, installed in the Yeongsan river South Korea from 2010 to 2012, has secured sustainable water resources and helped control flooding. However, low flow velocities due weir have deteriorated quality of water. For natural restoration, gate was opened 2017. In this study, three-dimensional finite difference model Visual MODFLOW used analyze effects opening on stream–aquifer interact...

Labyrinth weirs have not a straight crest in the perpendicular direction to the flow. The plan view of the weir consists of multiple and broken linear crests that cause the increase of its effective length. The advantages of this type of weirs are higher discharge capacity, easy aeration as well as low fluctuations of water surface at the weir upstream. This paper deals with the simulation of t...

As a type of dam with long history and wide range in the construction water conservancy projects my country, weir dams have functions flood control, irrigation diversion. Due to limitation conditions environment at that time, treatment is not standardized enough, which leads different degrees problems dam. Based on example Shangmaji weir, article focuses analysis leakage damage mechanism propos...

Side weirs are flow diversion devices that are widely used in irrigation, drainage and urban sewage systems. The present study focuses on the investigation of the effect of oblique side weirs on the discharge coefficient of a side weir under subcritical flow condition in rectangular channels. In this study 106 laboratory tests were conducted and the results were analyzed to find out the influen...

Schistosomiasis is a parasitic disease mostly found in areas along the Changjiang River, Oncomelanias is the only intermediate host of schistosomiasis. Oncomelania entering into farmland or the residential zones through the flood discharge or irrigation system is the main reason of spreading schistosomiasis. Therefore it is most essential and effective way to control diffusion of oncomelanias a...

Accurate measurement of stream flow is an important component of environmental water quality monitoring. Flow rates in small streams can be conveniently monitored using weirs. The objective of this study was to design, install, and calibrate a series of permanent compound weirs for use in monitoring flow and water quality in a first order riparian wetland stream that exhibited great variability...

Thin-plate V-notch weirs are commonly used as measuring devices in flumes and channels. Herein, the discharge calibration of a large 90o V-notch weir was performed using an unsteady volume per time technique. The weir overflow was initially shut. The sudden opening of the gate was associated with an initial phase of transient water motion associated with a negative wave propagating in the reser...

Hydrological changes affect not only the physicochemical factors and habitat structure of river ecosystems, but also biological communities sensitive to environmental changes, such as zooplankton. In this study, we investigate effects weir opening on variables topographic structures at Sejong Weir in South Korea monitor resulting distribution zooplankton community. led increased dissolved oxyge...