Causes of Lake Shrinkage in Pastoral Areas

Do you mean that the reason why lakes in pastoral areas are shrinking now is that there is reclamation around the lakes? There shouldn't have been a case of reclaiming land from lakes to reduce the area of lakes before, but that was in the south, not in pastoral areas. Since it is a pastoral area, as the name implies, it is an area where grazing is the living place, so it is of little significance to reclaim land around the lake. I don't think sediment deposition will reduce the lake area, because the amount of sediment flowing into the lake is generally a constant value, which has little effect. In addition, if you think so, for example, the lake is a bowl, and only the water inlet has no water outlet, so you keep replenishing water and sediment. Sediment should be deposited at the bottom of the bowl, but it will raise the water surface.

The diversion of the river may affect the lake surface. For example, the river that was originally injected into the lake is diverted, and now it is not injected into the lake, so the water inflow is reduced, the evaporation is unchanged, and the natural lake surface is reduced.