1 account for the change in position of the water table in the rainy and dry season
2 give the term for the flow in the river channel when the water table intersects with the channel bottom.
3 identify the type of river show in A,B and C and give a reason for each choice.
1) The change in position of the water table in the rainy and dry season can be accounted for by the variation in precipitation and groundwater recharge. During the rainy season, increased rainfall leads to higher levels of groundwater recharge, which in turn raises the water table. Conversely, during the dry season, decreased precipitation and higher rates of evaporation cause a decrease in groundwater recharge, leading to a lowering of the water table.
2) The term for the flow in the river channel when the water table intersects with the channel bottom is known as "baseflow." Baseflow refers to the portion of river flow that is derived from groundwater discharge, where the water table intersects with the underground river channel. It represents a consistent and often relatively low flow in the river, as it is sustained by groundwater sources even during periods of low precipitation or drought.
3) Without specific details or images provided, it is not possible to identify the types of rivers shown in A, B, and C. However, I can provide a general explanation for different types of rivers and the factors that may influence their characteristics:
- A meandering river is commonly characterized by gentle curves and loops in its channel. It may have a wide floodplain and tends to transport a significant amount of sediment. The presence of meanders typically indicates a river with a low gradient (slope) and slower flow velocity. The reason for this choice could be the presence of pronounced meanders in the river in image A.
- A braided river features a network of intertwining channels separated by sediment bars, islands, or gravel bars. These rivers generally have high sediment load and exhibit an unstable channel due to frequent avulsion events. The reason for identifying a river as braided could be the presence of multiple channels with sediment bars or islands, as seen in image B.
- A straight river has a linear channel without pronounced curves or meanders. It often indicates a river with a steeper gradient, faster flow, and less sediment transport. The reason for identifying a river as straight could be the absence of significant curves or meanders and a relatively straight channel, as seen in image C.
Remember, these are general explanations, and it is important to have more specific information or visuals to accurately identify the types of rivers.