River Series 2

Question 1

A Limited, convenient, and usually clearly defined and unambiguous topographic unit, available in a nested hierarchy of scales on the basis of stream ordering

Answer 1

Basin Geomorphic Unit

Question 2

Response system open to a cascade of inputs and outputs

Answer 2

A Physical Process

Question 3

T or F. If a drainage basin and channel morphology are related to the geologic, climatic and hydrologic character of the basin, then it is necessary to describe the features quantitatively in order to investigate these relationships.

Answer 3

T

Question 4

________ of the Basins maybe most appreciated when studying storm hydrographs where in an elongated catchment.

Answer 4

Shape

Question 5

Valuable indicator of the relationship between climate, vegetation, and resistance of rock and soil to erosion.

Answer 5

Density of the Stream networks

Question 6

Drainage density formula

Answer 6

(∑𝐿)/𝐴 Where:
L= Stream Length
A= Drainage Basin Area

Question 7

Quantitative measurement and generalization of land surface geometry. The complexity of drainage basins are derived from their being composed of _____, ______, ______, ______, ______, and ______.

Answer 7

divides, hillslopes, valley heads, terraces, floodplains and channels.

Question 8

The texture of the patterns of a basin has a control on the __________

Answer 8

hydrology of the drainage basin

Question 9

The Morphometric features of an erosional basin have been classified into _____, _____, _____, and ________.

Answer 9

linear, area, relief and gradient attributes.

Question 10

____________ states that the number of streams of different orders in a drainage basin tends closely to approximate an inverse geometric series in which the first term is the number of streams of order one.

Answer 10

law of stream number

Question 11

____________ states that the average lengths of the streams of each of the different orders in a basin closely approximate a direct geometric series in which the first term is the average length of streams of the first order.

Answer 11

law of stream length

Question 12

___________ states that slopes of streams of different orders are related to the stream order by an inverse geometric series

Answer 12

law of stream slopes

Question 13

____________ states that the main drainage basin areas of streams of different orders tends to closely approximate a direct geometric series in which the first term is the mean area of the first order basins.

Answer 13

law of drainage basin area

Question 14

____________ states that the drainage areas of streams of each order and the total stream length contained within and supported by these areas is direct logarithmic function.

Answer 14

law of contributing areas

Question 15

____________ a direct logarithmic function of the area of the drainage basin of the stream above the point at which discharge was measured.

Answer 15

discharge of a stream

Question 16

An index of the potential energy available in the drainage basin. The higher the ______ the higher the erosional forces acting on the basin.

Answer 16

Relief

Question 17

Determines the erodibility of the surface materials, and to some extent the permeability

Answer 17

Lithologic variations

Question 18

Gives secondary permeability for fluid flow, and a primary control for the orientation and drainage pattern of a system.

Answer 18

Geologic structures

Question 19

Enumerate morphometric controls.

Answer 19

• Relief
• Lithologic variations
• Geologic structures
• Climate and vegetation

Question 20

Enumerate erdogenic method.

Answer 20

Initiation
Elongation
Elaboration
Maximum extension
Integration

Question 21

Development of stream pattern on a pristine surface.

Answer 21

Initiation

Question 22

The growth of the channel into the available area and blocking out of the network

Answer 22

Elongation

Question 23

Filling out the network with lower order tributaries

Answer 23

Elaboration

Question 24

When drainage density is the greatest and the network fills the open spaces

Answer 24

Maximum extensions

Question 25

Loss of identity of the small order streams with progressive reduction of drainage density through time.

Answer 25

Integration

Question 26

Most commonly formed on horizontally bedded and uniform sediments or on uniformly resistant crystalline rocks.

Answer 26

Dendritic

Question 27

Usually develops on moderate to steep slopes, but also where regional structure, such as outcropping resistant rock bands, are elongated and parallel. All forms of transition can occur this type and dendritic and trellis pattern.

Answer 27

Parallel

Question 28

Patterns most commonly on dipping or folded sedimentary or weakly metamorphosed sedimentary rocks; also areas of joints and faults which intersect with right angles and old sand dunes with parallel alignment

Answer 28

Trellis

Question 29

Usually have a more or less perpendicular turns mainly caused by crisscrossing fractures.

Answer 29

Rectangular

Question 30

Occurs around domes or cones, and particularly common on volcanic areas.

Answer 30

Radial

Question 31

Patterns also develop around domes, where there exists alternating resistant and weak beds, so that the major channels cut through the strike and the low order streams follow the dip of the rocks.

Answer 31

Annular

Question 32

Can occur in a variety of conditions where local hummocks and depressions inhibit a continuous channel network. Irregular glacial deposits or erosional hollows due to solution of underlying lithology, irregular thawing permafrost. Coastal dunes, delta plains, and wind eroded hollows

Answer 32

Multibasinal

Question 33

Incised into rocks with complicated structural patterns. Associated with crystalline metamorphic rocks with a history of intense folding, jointing, intrusions, alterations, and faulting.

Answer 33

Contorted