I agree, it is really complicated to find one solution for a river with 25 km width. It has to be multiple solutions. It is possible to have one solution per location. There are many measures used before and now as mentioned here asap. In my mine this the steps which  might be considered: Modelling of the hydrodynamic and morphodynamic behaviour of this river. Classify the erodible locations in the river. For instance the hydrodynamic conditions and the soil characteristics. Apply all the possible measures to see their effects. Measures like groynes, fixed layer, sediment nourishment, and sediment dredging and bank revetment. It is important to know how to design the measure like the length and the angle of a groyne for instance at a certain location. Evaluate the measures per location socially, economically and environmentally The non-structural measures have to follow the same track. Eventually, you may mitigate the bank erosion in some locations, eliminate it from other locations and makes the bank erosion in totally new locations. The cycle is on and on…sustainability. And definitely the situation will be better than now and proactive approach “early warning system of bank erosion” will be under operation . But they need to start, the journey towards sustainable river management starts from  a comprehensive study and well knowledge to the system

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I agree, it is really complicated to find one solution for a river with 25 km width. It has to be multiple solutions. It is possible to have one solution per location. There are many measures used before and now as mentioned here asap. In my mine this the steps which  might be considered:

Modelling of the hydrodynamic and morphodynamic behaviour of this river.

Classify the erodible locations in the river. For instance the hydrodynamic conditions and the soil characteristics.

Apply all the possible measures to see their effects. Measures like groynes, fixed layer, sediment nourishment, and sediment dredging and bank revetment. It is important to know how to design the measure like the length and the angle of a groyne for instance at a certain location.

Evaluate the measures per location socially, economically and environmentally

The non-structural measures have to follow the same track.

Eventually, you may mitigate the bank erosion in some locations, eliminate it from other locations and makes the bank erosion in totally new locations. The cycle is on and on…sustainability. And definitely the situation will be better than now and proactive approach “early warning system of bank erosion” will be under operation .

But they need to start, the journey towards sustainable river management starts from  a comprehensive study and well knowledge to the system