Part 1-: The Hjülstom’s diagram for water is shown in the course manual and in t
ID: 109773 • Letter: P
Question
Part 1-:
The Hjülstom’s diagram for water is shown in the course manual and in the online module. This diagram above tells us which of the following?
a) flow of more than 1 m/s is required to move and erode gravel.
b) clays require even higher velocity than gravel to be lifted from the bottom.
c) higher velocity is required to induce transport than to maintain it.
d) fine sand is the most easily eroded particle size.
e) all of the above are correct.
Part 2-:
Think about how sediments are carried by running water and what happens when the running water enters a large standing body of water. The suspended load of the river is deposited _________ and the bedload of the river is deposited ______________.
a) far upstream, on the deep ocean floor
b) at the shoreline, farther from shore in deeper water
c) offshore in deeper water, near shore where the river current drops suddenly
d) in sandbars along the river banks, in coral reefs
e) both B and C are correct.
Pafrt 3-:
The common detrital sedimentary rocks in order of increasing particle size are:
a) sandstone, mudrock, breccia
b) breccia, mudrock, sandstone
c) mudrock, sandstone, breccia
d) breccia, sandstone, mudrock
e) mudrock, breccia, sandstone
Part 4-:
Based on _____, the sequence of sedimentary features found on the land surface is duplicated vertically and can be seen in a core of sediment left by the river as it migrates.
a) Walther’s Law
b) Hjülstom’s diagram
c) Stocke’s Law
d) Rubey’s formula
e) none of the above
10 Zone of Erosion 1.0 Rubey's Formula Zone of Transport 0.1 Zone of Deposition Fine Sand Sand ClaySilt 0.004 Gravel 0.06 2.0 1000 Particle Size (mm)Explanation / Answer
Part 1: Ans: e) all of the above are correct.
Hjülstom’s diagram is a graph used by hydrologists and geologists to determine whether a river will erode, transport, or deposit sediment. It explain about the eroding and depositional process of water. How water erode the material how much velocity is required to flow the particular type of material.
Part 2: Ans: c) offshore in deeper water, near shore where the river current drops suddenly
The suspended particles of the river just settled down in the deep water of the steady water body but the bedload is just deposited along the shore of the rivers.
Part 3: Ans: c) mudrock, sandstone, breccias
Explanation: Detrital or clastic sedimentary rocks are composed of rock fragments. They are different than chemical sedimentary rocks, which are composed of mineral crystals. Detrital sedimentary rocks are classified mainly by the size of their grains, and secondarily by the composition of the grains. Examples are sandstone, shale, siltstone breccias etc.
Part 4: Ans: a) Walther’s Law
Walther's law of facies implies that a vertical sequence of facies will be the product of a series of depositional environments which lay laterally adjacent to each other. This law is applicable only to situations where there is no break in the sedimentary sequence.