83 votes

Are there any saltwater rivers on Earth?

The water in any river draining the sea is infinitely recycle-able (from rain replenishment), whereas the salt from any terrestrial source is not. So salty rivers, if any, won't exist permanently. ...
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45 votes

Is there any river that does not discharge into larger body of water?

The Okavango River is a good example of this. It drains into a swampy delta in the middle of the Kalahari desert: The Okavango Delta, CC BY Justin Hall.
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35 votes

Is there any river that does not discharge into larger body of water?

The Colorado River frequently fails to reach the Gulf of California, mostly due to diversion to agricultural and metropolitan uses upstream. This National Geographic post from 2014 elaborates on the ...
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  • 2,803
34 votes

Are there any saltwater rivers on Earth?

The already accepted answer is already covering the "real" answer as far as I'm concerned, and while you won't find many (any?) saline rivers in the traditional sense, we do have underwater &...
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31 votes
Accepted

How do oases form in the middle of the desert?

Oasis are places where aquifers are connected to the surface. The source of the water in the aquifer however can be hundreds of miles away in areas that do get significant rainfall. The trick is ...
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  • 6,465
28 votes

Are there any saltwater rivers on Earth?

The Pecos River in Texas, USA may arguably fit the description of a "saltwater river". A point of argument is what is considered to be "saltwater". For comparison, here are some ...
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28 votes

Is there any river that does not discharge into larger body of water?

The concepts you are looking for are two categories of drainage basins, endhoreic basins and cryptorheic basins. Endhoreic basins are drainage basins that do not drain to the oceans, either above ...
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26 votes

Where does the Amazon River really begin?

From an Earth Science standpoint, it's meaningless to ask about the "source" of a river in this way. The "source" of a river is the rainfall within its drainage basin, which percolates down into ...
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  • 3,028
26 votes

Is there any river that does not discharge into larger body of water?

There are rivers that don't flow into seas or lakes if you consider influent rivers. Which are rivers that loose water to the ground (seeps into aquifers). For example "big lost river" of ...
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24 votes

Are there any saltwater rivers on Earth?

Water from the Caspian sea, with a salinity of 1.2%, is constantly flowing into Garabogazköl, where the water eventually evaporates and leaves the salt behind. Of course, the situation is not ...
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21 votes
Accepted

To what extent is hydroelectric power really renewable?

Electricity from waves, from hydro (both run-of-river and storage) and from wind, are all indirect forms of solar power. Electricity from tides is different, and we can deal with that in a separate ...
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  • 4,060
19 votes
Accepted

Do dams reduce the flow of river downstream?

Once a dam has been constructed in a river, the natural flow of water will be disrupted. You correctly state that initially there will be a period required for the dam to fill. Until then, little of ...
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  • 20.3k
18 votes

How important is understanding linear algebra in groundwater modeling?

Relatively important, depending on the basic principles of the modeling you are interested in, and to what extent you want to get yourself involved in it. In many areas of computational geophysics, e....
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  • 4,925
18 votes

Are there any saltwater rivers on Earth?

Here in New York City we have a salt "river". It is called the "East River" and it separates part of Long Island (Brooklyn and Queens) from the island of Manhattan and the mainland (The Bronx). ...
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  • 297
17 votes
Accepted

Is there a database of global rainfall time series?

Yes. Nearly global satellite and radar derived rainfall data are hosted by NASA Goddard Space Flight Center, namely: Tropical Rainfall Measurement Mission (TRMM) aboard the TRMM Microwave Imager (TMI)...
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  • 4,925
17 votes

How and why do these tree-like river structures form?

The river isn't splitting. The picture shows a number of dendritic drainage channels flowing into a larger river/stream. They are the most common form of topographical draining system. They develop in ...
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  • 20.3k
16 votes
Accepted

How do long rivers exist?

Well, I can only agree that it is indeed amazing and it doesn't get less amazing when some geology, hydrology and geomorphology is added to the the amazement. All precipitation that falls on land ...
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  • 5,896
16 votes

How is it possible to use up the water in a region?

This is a really complex problem and would require a really detailed explanation about atmospheric circulation, meteorology and hydrology. The short answer to your question is that water is going ...
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  • 1,248
14 votes
Accepted

How does a meandering river form?

I'm under the impression you're not asking why a meandering river will keep meandering, but why even a straight river will start to meander in the first place. The first is indeed by erosion of the ...
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  • 2,602
14 votes

How does a meandering river form?

Meanders amplify themselves--the stream tends to erode on the outside of the meander (forming a cut bank) and deposit sediment on the inside (forming a point bar). Eventually, the meander will ...
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  • 588
14 votes

Is there a database of global rainfall time series?

If you are looking for a dataset going back a bit further, but still sticking to satellite and radar data, GPCP (Global Precipitation Climatology Project) goes back to 1979. The limitation of certain ...
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  • 1,787
14 votes

Are there any saltwater rivers on Earth?

I live near a river named Salz, flowing both warm and salty on the north slope of the Pyrenees south of Carcassonne. In historical times it was boiled dry for salt. See Les Sources de Salz
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  • 141
14 votes
Accepted

How is it possible to use up the water in a region?

You're making a mistake, at least for the second case: In the second case, the water ends up as rain, presumably within a few hundred kilometers of the evaporation point. You cannot model a dry ...
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  • 11.1k
14 votes

Do dams reduce the flow of river downstream?

You're correct that simply putting a dam in place, once its lake is filled, doesn't change the average flow downstream by more than a few percent (those few percent can be lost to increased ...
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14 votes

How do oases form in the middle of the desert?

There are two types of oases: natural and human made. Natural oases form when springs, created when underground aquifers allow fresh water to pool or flow on the ground surface of deserts, creating a ...
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  • 20.3k
13 votes
Accepted

Are there situations where the groundwater table doesn't follow the morphology of the surface?

The groundwater table depends on a lot of properties. These include precipitation rates, permeability/transmissivity of the subsurface and regional groundwater flow. There are two different regimes ...
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  • 2,602
13 votes

Rocks sparking under water

Is this possible? Definitely. I know you can get sparks from some rocks and minerals - but granite boulders [?] Yep. Quartz is one of those minerals that "sparks". It is piezoelectric, and ...
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  • 22.2k
12 votes

How do long rivers exist?

I will attempt at rephrasing your interesting question after these considerations: At the continental scale, flowing water has no significant inertia, so water flows following the maximum slope. A ...
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  • 1,663
12 votes

Are there any saltwater rivers on Earth?

There are salt water rivers in different places of the world where ground water flows in contact with salt layers. There is a river in Catalonia named Ribera Salada (meaning salty river in Catalan). ...
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  • 829
11 votes
Accepted

Recharge a dry aquifer?

Fossil groundwater is water that has been trapped below the surface for several thousands of years. It is considered non-renewable as natural recharge on human timescales is practically zero. This is ...
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  • 2,602

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