## Dynamic Planet B/C

The Eviscerator
Member
Posts: 189
Joined: February 27th, 2011, 12:28 pm
Division: C
State: NC

### Re: Dynamic Planet B/C

A couple pages back, someone mentioned calculating "rouse." Could someone explain what "rouse" is? I googled it, but all I could find was the last name of someone and "rouse belts," which are related to earthquakes...

gigaboo
Member
Posts: 64
Joined: February 23rd, 2011, 9:46 pm
Division: C
State: UT

### Re: Dynamic Planet B/C

My test was plotting points, contouring a map, circling a drainage basin and a couple questions. We didn't need our notes at all.

personasaurus rex
Member
Posts: 358
Joined: July 7th, 2010, 9:39 pm
Division: C
State: NY

### Re: Dynamic Planet B/C

The Eviscerator wrote:A couple pages back, someone mentioned calculating "rouse." Could someone explain what "rouse" is? I googled it, but all I could find was the last name of someone and "rouse belts," which are related to earthquakes...

The Rouse number is a non-dimensional number in fluid dynamics which is used to define a concentration profile of suspended sediment and which also determines how sediment will be transported in a flowing fluid.
^Wikipedia <3 haha
2012: Forensics, Dynamic Planet, Sounds of Music, Water Quality, Write It Do It

The Eviscerator
Member
Posts: 189
Joined: February 27th, 2011, 12:28 pm
Division: C
State: NC

### Re: Dynamic Planet B/C

personasaurus rex wrote:
The Eviscerator wrote:A couple pages back, someone mentioned calculating "rouse." Could someone explain what "rouse" is? I googled it, but all I could find was the last name of someone and "rouse belts," which are related to earthquakes...

The Rouse number is a non-dimensional number in fluid dynamics which is used to define a concentration profile of suspended sediment and which also determines how sediment will be transported in a flowing fluid.
^Wikipedia <3 haha

I can't believe I forgot to check wikipedia... Thanks though, that clears it up a lot.

Edit: How have you guys been getting your information? I've just been googling things and it seems like I'm missing some things... Do you guys use textbooks, and which ones?

emd19
Member
Posts: 14
Joined: September 17th, 2009, 11:06 am
Division: B
State: PA

### Re: Dynamic Planet B/C

The Rouse number is a non-dimensional number in fluid dynamics which is used to define a concentration profile of suspended sediment and which also determines how sediment will be transported in a flowing fluid. It is a ratio between the sediment fall velocity and the upwards velocity on the grain as a product of the von Kármán constant and the shear velocity .

2009:NW PA
3rd in regionals Fossils
2nd Regionals pentathlon
2010: NW PA
1st Fossils
3rd Ornithology
2010: PA States
5th Fossils
2011: NW PA regionals
1st in Fossils, Road Scholar, Experimental Design,Ecology and Dynamic Planet

junexia
Exalted Member
Posts: 147
Joined: August 18th, 2009, 10:24 am
Division: C
State: PA

### Re: Dynamic Planet B/C

i don't know if this has already been asked, but what sources is everyone using for world's largest rivers/lakes? i've looked at a couple of different sources, and each one listed them in different orders
Events for 2011:
Ornithology <3, Fossils, Ecology, Microbe Mission, Dynamic Planet

personasaurus rex
Member
Posts: 358
Joined: July 7th, 2010, 9:39 pm
Division: C
State: NY

### Re: Dynamic Planet B/C

emd19 wrote:The Rouse number is a non-dimensional number in fluid dynamics which is used to define a concentration profile of suspended sediment and which also determines how sediment will be transported in a flowing fluid. It is a ratio between the sediment fall velocity and the upwards velocity on the grain as a product of the von Kármán constant and the shear velocity .

I doubt this will be asked. It's very complicated physics. This event will stick mostly with geography. The hardest test I've taken was mostly IDing, types of lakes, and interpreting graphs. Even at my state level, the test was disappointingly easy and barely went beyond basic vocabulary...
2012: Forensics, Dynamic Planet, Sounds of Music, Water Quality, Write It Do It

strikerbear10
Member
Posts: 27
Joined: March 30th, 2011, 11:45 am
Division: C
State: MI
Location: Why???

### Re: Dynamic Planet B/C

Could someone please give me a good website for topo maps?

The Eviscerator
Member
Posts: 189
Joined: February 27th, 2011, 12:28 pm
Division: C
State: NC

### Re: Dynamic Planet B/C

strikerbear10 wrote:Could someone please give me a good website for topo maps?

topomaps.usgs.gov
The test probably won't have many questions on topo maps though... Even if they do, they will probably be very basic things that you can use common sense and figure out.
Last edited by The Eviscerator on April 20th, 2011, 3:45 pm, edited 1 time in total.

bwy
Exalted Member
Posts: 65
Joined: December 22nd, 2009, 1:52 pm
Division: C
State: CA

### Re: Dynamic Planet B/C

The Eviscerator wrote:
strikerbear10 wrote:Could someone please give me a good website for topo maps?

topomaps.usgs.gov
The test probably won't have many questions on topo maps though... Even if they do, they will probably be very basic things that you can use common sense and figure out.

On the contrary, my regionals test was just 3 topo maps, with a lot of questions about them.
It was pretty hard, but i managed to get 3rd

The Eviscerator
Member
Posts: 189
Joined: February 27th, 2011, 12:28 pm
Division: C
State: NC

### Re: Dynamic Planet B/C

bwy wrote:
The Eviscerator wrote:
strikerbear10 wrote:Could someone please give me a good website for topo maps?

topomaps.usgs.gov
The test probably won't have many questions on topo maps though... Even if they do, they will probably be very basic things that you can use common sense and figure out.

On the contrary, my regionals test was just 3 topo maps, with a lot of questions about them.
It was pretty hard, but i managed to get 3rd

What questions on topo maps did you have?
On my regionals test, the test was about 1/3 map, but it only asked basic things, like find the lowest elevation, highest elevation, tributaries of a river, sinuosity ratio of a river, etc.

*EDIT: Question: Is hydraulic head essentially the height of groundwater above sea level? I know that it is the pressure groundwater is exerting and is calculated relative to a datum, such as sea level, and since you can directly calculate hydraulic gradient from it, this seems to make sense to me. I know this is probably an over-simplification, but oh well.

Also, can someone explain Darcy's Law more in depth? I'm looking at the wikipage for it (http://en.wikipedia.org/wiki/Seepage#Darcy.27s_law), but I have no idea how to calculate the rate of pore pressure...

Also, do you guys think that putting a list of common Chezy and Manning coefficients and permeability coefficients on the sheets is necessary?

bwy
Exalted Member
Posts: 65
Joined: December 22nd, 2009, 1:52 pm
Division: C
State: CA

### Re: Dynamic Planet B/C

The Eviscerator wrote:
bwy wrote:
On the contrary, my regionals test was just 3 topo maps, with a lot of questions about them.
It was pretty hard, but i managed to get 3rd

What questions on topo maps did you have?
On my regionals test, the test was about 1/3 map, but it only asked basic things, like find the lowest elevation, highest elevation, tributaries of a river, sinuosity ratio of a river, etc.

*EDIT: Question: Is hydraulic head essentially the height of groundwater above sea level? I know that it is the pressure groundwater is exerting and is calculated relative to a datum, such as sea level, and since you can directly calculate hydraulic gradient from it, this seems to make sense to me. I know this is probably an over-simplification, but oh well.

Also, can someone explain Darcy's Law more in depth? I'm looking at the wikipage for it (http://en.wikipedia.org/wiki/Seepage#Darcy.27s_law), but I have no idea how to calculate the rate of pore pressure...

Also, do you guys think that putting a list of common Chezy and Manning coefficients and permeability coefficients on the sheets is necessary?

chezy and manning coefficients sounds like overkill. i never needed them for regionals or states, just the equations and basic plugging in.
hydraulic head is pretty confusing, but according to wikipedia it sounds like it's basically the height of water relative to something. it could be sealevel, or it could even be the depth from the ground to the water, or it could be how high water rises in a tube when put in an aquifer according to the stuff I've read.

the topo test i took asked about stream order, gradient, sinuosity ratio, what certain symbols meant, direction of stream flow, alluvial landforms (that question was hard but I can't remember exactly what it was asking...)
sorry i'm probably not being very helpful.

personasaurus rex
Member
Posts: 358
Joined: July 7th, 2010, 9:39 pm
Division: C
State: NY

### Re: Dynamic Planet B/C

bwy wrote:
The Eviscerator wrote:What questions on topo maps did you have?
On my regionals test, the test was about 1/3 map, but it only asked basic things, like find the lowest elevation, highest elevation, tributaries of a river, sinuosity ratio of a river, etc.

*EDIT: Question: Is hydraulic head essentially the height of groundwater above sea level? I know that it is the pressure groundwater is exerting and is calculated relative to a datum, such as sea level, and since you can directly calculate hydraulic gradient from it, this seems to make sense to me. I know this is probably an over-simplification, but oh well.

Also, can someone explain Darcy's Law more in depth? I'm looking at the wikipage for it (http://en.wikipedia.org/wiki/Seepage#Darcy.27s_law), but I have no idea how to calculate the rate of pore pressure...

Also, do you guys think that putting a list of common Chezy and Manning coefficients and permeability coefficients on the sheets is necessary?

chezy and manning coefficients sounds like overkill. i never needed them for regionals or states, just the equations and basic plugging in.
hydraulic head is pretty confusing, but according to wikipedia it sounds like it's basically the height of water relative to something. it could be sealevel, or it could even be the depth from the ground to the water, or it could be how high water rises in a tube when put in an aquifer according to the stuff I've read.

the topo test i took asked about stream order, gradient, sinuosity ratio, what certain symbols meant, direction of stream flow, alluvial landforms (that question was hard but I can't remember exactly what it was asking...)
sorry i'm probably not being very helpful.

The only question I've ever encountered on Chezy-Manning is "what is the label for this symbol?" and the answer was m/s for velocity haha.
And for hydraulic head, although it does involve pressure, etc, I doubt they'll go any deeper than height above a reference point. That reference point is almost always sea level.
2012: Forensics, Dynamic Planet, Sounds of Music, Water Quality, Write It Do It

The Eviscerator
Member
Posts: 189
Joined: February 27th, 2011, 12:28 pm
Division: C
State: NC

### Re: Dynamic Planet B/C

Thanks.
Anybody have a good way of measuring the length of a stream on a topographic map without a string? We just kind of twisted the ruler around to get the length, which seemed kind of imprecise...

rfscoach
Coach
Posts: 586
Joined: July 7th, 2008, 4:58 pm
Division: B
State: GA

### Re: Dynamic Planet B/C

The Eviscerator wrote:Thanks.
Anybody have a good way of measuring the length of a stream on a topographic map without a string? We just kind of twisted the ruler around to get the length, which seemed kind of imprecise...

Photo copy a ruler on to the edge of one of your cheat sheets.
I am the Lorax. I speak for the trees. I speak for the trees, for the trees have no tongues.