Please write it by world 22;Describe stratification in lakes and reservoirs. You
ID: 1709917 • Letter: P
Question
Please write it by world
22;Describe stratification in lakes and reservoirs. You can include a drawing to help convey the process. How does stratification change seasonally? How might this influence water chemistry?
29;Describe stratification in estuaries. How is it different from freshwater systems? How does it influence water chemistry?
35;What is the difference between a colloid and suspended sediment? What are some size ranges for the following particles:
Colloidal iron oxide
Bacteria
Virus
Silt
Clay
Sand
Explanation / Answer
22. In lakes or reservoirs, the particle sedimentation takes place based on the particle sizes. The larger size particles that are visible to naked eye and larger than colloids get settle down. Others of smaller size remain suspended. This causes the stratification of the lake water. The bottom most bed layer is densest and contains the inorganic and organic matter such as silt and dead plants or animals.
The organic matter gets decomposed if the oxygen is available, however in stratified lakes, there is no mixing of the hypolimnion, and therefore oxygen does not replenish once consumed. This causes the decomposition to get stopped, or even some of the animals or bacteria can die. Other anaerobic bacteria can operate in such conditions.