1) Sediment transport in streams and rivers may be sub-divided into the bed-load
ID: 120889 • Letter: 1
Question
1) Sediment transport in streams and rivers may be sub-divided into the bed-load, suspended load and dissolved load. Describe the relationship between the three components of sediment transport, and the related concepts of flow rate and regime, grain size, and sediment mobility. (20 Marks)
HINT: For full credit remember to discuss the role that minerals and mineral properties may play on grain and grain aggregate size).
2) Two common rock-forming minerals that crystallize at the highest temperatures in many mafic magmas are pyroxenes and feldspars. The crystallization of these two phases, and their removal from a crystallizing magma have the potential to change the composition of rocks that crystallize from the remaining magma.
Explanation / Answer
SOLUTION:-1Bed load consists of sediments that are moving along in a river bottom, or just above the bottom, essentially by either rolling or "saltation," where particles bounce along the bottom. These heavier particles are usually sands and gravel.Suspended load consists of particles suspended in the water above the bottom. Suspended load consists of generally finer, smaller particles than bed load (like silt and clay). Dissolved load is pretty obvious. Solids dissolved in the water move along with the water.Once material is detached from the channel it can be transported. Transportation is the movement of earth material, in this case, by water. As particle size increases, so too does the velocity needed to transport it. The material transported through the stream is it's stream load. Stream load is composed of dissolved or solution load, suspended load, and bed load. The dissolved load comes primarily from groundwater seepage into the stream. Ions in solution also come from the solution of materials that line the channel. The "dissolved load" does not involve any particles that could be separated from the water by filtering it -- the mixing has happened at the molecular level. The "bed load" describes material that is swept along the bottom of the stream. The "clastic load" includes both the suspended load and the bed load (but not the dissolved load).
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.