Which of the following geophysical parameters are used for monitoring hydrologic drought?*1 pointTemperatureNDVIGroundwaterPrecipitation

The geophysical parameters used for monitoring hydrologic drought include:

1. Groundwater: Groundwater levels can significantly drop during periods of hydrologic drought. Monitoring these levels can provide valuable information about the severity and duration of a drought.

2. Precipitation: Precipitation, including rain, snow, and other forms of moisture, is a primary source of water replenishment. Monitoring precipitation levels can help identify periods of reduced rainfall, which may indicate a drought.

3. Temperature: Higher temperatures can increase evaporation rates, reducing water availability and potentially contributing to drought conditions. Therefore, monitoring temperature can also be important in drought assessment.

4. NDVI (Normalized Difference Vegetation Index): This is a measure of the greenness or vegetation health, which can be affected by the availability of water. Lower NDVI values may indicate stress on vegetation due to drought.

So, all the mentioned parameters - Temperature, NDVI, Groundwater, and Precipitation are used for monitoring hydrologic drought.