Retrograde / Revetments are retrofitting structures placed on river banks to absorb incoming water energy to protect a river bank cliff or the surface of the embankment slope against erosion and overtopping to land and overall play a role in improving the stability of the river channel or the body of the embankment Protected. Besides being used to protect river slopes, revertment is also commonly used to protect levees, or beaches.
The surface of the building facing the direction of the waves can be either vertical or oblique. This building can be made of stone, concrete, concrete pipe, plaster, wood or rock pile or some kind of revertment produced by the factory as you can see in https://www.maccaferri.com/my/products/reno-mattress/. But what is often encountered in the field is a revertment made of stone piles with the outer layer consists of stones with a larger size.
Slope reinforcement factors in rivers
Protection or protection against river cliffs is intended to protect slopes or cliffs along the river from unwanted changes, such as erosion or sedimentation in the shipping or harbor flow.
Slope reinforcement classification
Slope reinforcements are constructed with a variety of purposes that match the safety of the cliff required and against what threats are threatened. Therefore, slope reinforcement is classified into 3 types according to the protected river section, namely:
- Retrograde embankment (levee revetment)
This reinforcement is built on the slope of the embankment with the intention of protecting it from the scouring of river currents. Strong construction needs to be built on embankments very close to the river bank cliffs when a strong water hummer is expected and can be dangerous when the river’s surface reaches its maximum point.
- Strengthening river bank (low water revetment)
This reinforcement is made on river bank cliffs to protect the cliff against the scouring of river currents and prevent meanders from flowing in the river. In this retrofitting building needs to be held security-security because in the event of flood, this building will sink entirely.
- Continuous slope strengthening (high water revetment)
Continuous slope reinforcement is built on the embankment slopes and continuous river cliffs (on the part of the river where there is no riding).
Slope reinforcement planning
The reinforcement of slopes on river banks is very important, especially rivers that have strong current characteristics or that carry a lot of sedimentary materials. Therefore planning of slope retrograde in the framework of river maintenance should not be done in vain. If done in vain that will happen only waste and retrofitting does not work properly as it should.
There are several things that are important in the consideration and planning of slope reinforcement, they are also a systematic step in order to strengthen these slopes to function properly after they are built.
Slope reinforcement construction parts
- Slope protectors are a major part of slope retrofitting buildings. This section protects the surface of the embankment slope or the river’s cliff surface against the flow of the river. The selectors of slope protective construction should be based on the river regime or its location.
- Foundation and foot protector is a construction that serves as a foundation / pedestal protective slope, and its placement on the foot of the embankment or foot of the river bank.
- The connection is made at each distance of 20 m of slope loading and serves as a constructive separation joint and localizes the possibility of damage. If the slope is protected high enough, then held a longitudinal connection.
- Consolidation / protective stretching is placed on the surface of the river bed in front of the foundation that serves to secure the foundation’s stability and protect it against the scouring of river currents. This protective cover also protects the bottom surface of the river against current scouring.