Final answer:
Landscapes prone to heavy rainfalls or those near river systems with a history of increased flooding events may be more susceptible to regional flooding, while areas with intense, localized rainfall are at risk of flash flooding.
Step-by-step explanation:
The flooding susceptibility to depends on several factors, including the type of landscape, weather patterns, and the presence of water retention or runoff features in the environment. In general, landscapes can be more prone to either regional flooding or flash flooding, or in some cases, both. Regional flooding typically occurs when large areas of land are inundated with water due to prolonged rainfalls or snowmelt, while flash flooding is a rapid flooding of low-lying areas in less than six hours, which can be caused by intense rainfall from thunderstorms or sudden release of water from an upstream source.
Considering the provided information, we can discern that areas suffering from an increase in flooding events over the past six decades, especially in agricultural regions connected to river systems and affected by extreme weather, could be susceptible to regional flooding due to prolonged and heavy rainfall. This kind of flooding can cause waterlogged or saturated soils, and occasionally complete submergence.
Moreover, flash floods, as mentioned to occur in the Gobi Desert of Mongolia, are typically caused by intense, localized rainfall and can happen in arid or semi-arid regions but are also common across areas such as the Southern United States. Factors such as the local topography, soil conditions, and whether the area can absorb or quickly runoff water would influence the risk of flash flooding.