Lernkarten

Christian Voegeli
Karten 58 Karten
Lernende 2 Lernende
Sprache English
Stufe Grundschule
Erstellt / Aktualisiert 15.10.2013 / 16.01.2017
Lizenzierung Namensnennung - Weitergabe unter gleichen Bedingungen (CC BY-SA)     (Voegeli Christian, ETHZ)
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Fenster schliessen

how to monitor?

traditional: point measurements

 - loss of information with respect to space variability

advanced: distributed in time and space

- remote sensing

Fenster schliessen

how to monitor?

  • traditional: point measurements
    • loss of information with respect to spacial (and temporal) variability
  • advanced: measurements distributed in time and space
    • remote sensing
Fenster schliessen

measurements are possible for:

  • rainfall
  • soil moisture
  • vegetation cover
  • land use
  • thematic maps
Fenster schliessen

problems of measurements by remote sensing:

low penetration of the ground: ca 5-10 cm

Fenster schliessen

what does radar mean?

 

RAdio Detecting And Ranging

Fenster schliessen

how does a weather radar work?

  1. emission and reception of el mag waves
  2. backscattering from objects
    1. reflectivity (Z)
  3. Z is dependent on Drop Seize Distribution (DSD)
  4. Z is converted to precipitation depth
Fenster schliessen

why monitoring?

  • to avoid inaccurate forecasting (due to inaccurate data base)
  • understand processes
  • build models
  • verify modeling results
Fenster schliessen

advanced methods in hydrology can....

  • reproduce nature's behavior
  • maximise the efficiency of planning
  • minimise the risk of failure
  • analyse interaction with other systems