'downslope' is a correct and usable word in written English.
You can use it to refer to a downward slope or a downward trend. For example: "The stock market has been on a downslope for the last few weeks."
That is important, because the world is on the downslope of the great demographic convulsion of the past few centuries.
Benthic faunas adapted to their changing living conditions at particular bathymetric levels by simply shifting upslope or downslope.
These cores have revealed the importance of turbidity currents—occasional catastrophic torrents of sediment-laden, and hence denser, water flowing downslope under clear water as carriers of great quantities of sediment to the greatest depths in the Atlantic.
At night, as the slopes cool, the direction of airflow is reversed, and cool downslope drainage motion occurs.
Downslope winds are called fall winds or katabatic winds.
The first such process is a downslope movement of sediments by mass wasting, a set of gravity-deposition events, including submarine landslides, slumps, debris flows, and high-velocity sediment-laden density flows known as turbidity currents.
Major portions of entire soil profiles can move downslope suddenly by the combined action of water and gravity.
Kaolin will be a dominant clay mineral group only if the removal of silica by leaching is not complete or if there is an encroachment of silica-rich waters as can occur, for example, when water percolating through a soil profile at the upper part of a toposequence moves downslope into a soil profile at the lower part.
If the caves were formed by pressure flow beneath the water table, the passage profile can be irregular, with both downsloping and upsloping segments.
We had left the main road, and Ali made his way carefully through the steep dunes, gathering speed on downslopes and slip-sliding up the next amber wave.
Gravity, able to overcome the cohesive forces that hold soil particles together, can cause the entire soil profile to move downslope a phenomenon called mass movement.
