Friday 8 January 2016

The Drainage Basin Hydrological Cycle.

The drainage basin hydrological cycle:

The drainage basin hydrological cycle is an open system with both inputs and outputs.ater and energy from the sun enter the drainage basin from outside and ater can be lost from the drainage basin in a number of different ways.

Inputs into the drainage basins include: 

  • Energy from the sun for evapouration.
  • Precipitation (Rain and Snow).

Outputs out of the drainage basin incude:

  • Evapouration and transpiration from plants (Together they are called evapotranspiration).
  • Runoff into the sea.
  • Water percolating (moving downwards) deep into underground store, through this process some water is lost from the system.

Different stores of water in the drainage basin:

  • Surface stores such as glaciers, rivers, lakes and puddles.
  • Vegatation stores water through interception.
  • Soil holds water when it becomes saturated.
  • Groundwater is stored in permeable surfaces.

Transfers and flows move water through the system.Transfers include:

  • Throughfall- The water that drips off of leaves during a rainstorm. 
  • Stemflow- The water that runs down the stems and branches of plants and trees during and rain has reached the ground.
  • Infiltration-The passage of water into the soil.
  • Throughflow- The water that moves down-slope through the subsoil, pulled by gravity.
  • Groundwater flow- The slowest transfer of water within the drainage basin. It provides the main input of water into a river during drought or dry seasons.
 

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