Meander floodplain management and stabilization of riverbank in urban region

The normalization of the Meander River in the past caused environmental problems, changed the river’s ecology, and required heavy maintenance such as stabilizing riverbanks with revetments, sheet piles and other constructions. Pesanggrahan River, located at Southern Region of Jakarta, Indonesia which has a meander channel at the border between the middle reach and downstream reach. The river was normalized at the end of the year 2012 with several modifications such as resection, realignment and cutting-off meandering bends. Analysis the effect of normalization consisting of meander cut-off and riverbank stabilization presented in this paper in term of the behaviour of sediment transport along the channel that has been normalized. HEC-RAS program is used to track the Pesanggrahan river flow from upstream to downstream before and after normalization. The Ackers-White equation used to calculate the amount of sediment for each section based on the change of the river section due to sediment motion after normalizing of the channel river. From the results of the study, it is proposed that a river naturalization or low impact development (LID) approach, such as floodplain management especially at the meander bend with riparian ecosystems that maintain stabilization at the riverbank also maintain habitat heterogeneity, is an important factor for the long-term survival of several rare and endangered species.

Meander Designer: Automatically Generating Meander Channel Designs

Microfluidics continues to bring innovation to the life sciences. It stimulates progress by enabling new ways of research in biology, chemistry, and biotechnology. However, when designing a microfluidic device, designers have to conduct many tasks by hand—resulting in labor-intensive processes. In particular, when drawing the design of the device, designers have to handle re-occurring entities. Meander channels are one example, which are frequently used in different platforms but always have to fit the respective application and design rules. This work presents an online tool which is capable of automatically generating user-defined, two-dimensional designs of fluidic meander channels facilitating fluidic hydrodynamic resistances. The tool implements specific design rules as it considers the user’s needs and fabrication requirements. The compliance of the meanders generated by the proposed tool is confirmed by fabricating the generated designs and comparing whether the resulting devices indeed realize the desired specification. To this end, two case studies are considered: first, the realization of dedicated fluidic resistances and, second, the realization of dedicated mixing ratios of fluids. The results demonstrate the versatility of the tool regarding application and technology. Overall, the freely accessible tool with its flexibility and simplicity renders manual drawing of meanders obsolete and, hence, allows for a faster, more straightforward design process.

Experimental Study on River Meander Planform Pattern

River meander basically related with one of the main catastrophe in real scenario such as flood. The number of research on river meander characteristics and process is quite small. Therefore, the study on river meander and its characteristics by using a physical model is one of the methods to enhance the knowledge on it. The main purposes for current study are to determine the characteristics of meandering river and to investigate the lateral movement of the river meander channel bank. The scope of study includes execution of desk study and developing a physical model of river meander by using sand channel in order to understand the behaviors of meandering river. All of the parameters and calculations are investigated through the experimental works. Based on the experimental works, the explanation on the river meander characteristics and planform lateral movement due to the process of erosion and deposition are achieved. Erosion and deposition process give an increment to the initial channel width with respect to the angle of direction β and flow rate Q. As a conclusion, this study can give a plenty of information that can act as references to gain more understanding on the river meander planform pattern.

A Study on the Evolution Characteristics of the Large Structure of Turbulence in a Meander Channel

In this paper, we adopt theoretical method to study the evolution characteristic of the two dimensional turbulent vortex structures in a meander channel. The disturbance growth rates under different bank curvatures are simulated. The result showed that the change of growth rate of smaller vortices is more intensive than bigger vortices. Future more, we consider the coherent vortex structure as a kind of disturbance to study the evolution characteristics of multi-scale turbulent structures in a meander channel, make basis for finding “meander channel-forming vortices” which is controlling the river shape and adapt to the meander river in theoretic.