Giáo trình bài tập chapter5

CHAPTER 06 THE SUBSURFACE ENVIRONMENT UA-2011 1- GROUND WATER AND TEMPERATURE 1.1 ᾶ GROUND WATER 1.2 ᾶ TEMPERATURE 2- PRESSURE AND DYNAMICS 2.1 – PRESSURE 2.2 – DYNAMICS 1- GROUND WATER AND TEMPERATURE 1.1 ᾶ GROUND WATER 1.1.1 ᾶ Origin of ground water 1.1.2 ᾶ Chemistry of ground water 1.2 ᾶ TEMPERATURE 1.2.1 ᾶ Subsurface Temperature 1.2.2 ᾶ Regional thermal Variations 1.2.3 ᾶ Local thermal Variations 1.1- GROUND WATER 1.1 ᾶ Origin of ground water (GW) 04 types of GW Meteoric water Connate water Juvenile water Mixed water 04 Types of GW Meteoric water Infiltration of rainwater Distribution @ shallow depth Total mineralization: Low Tens to be Oxidizing pH: Often acidic due to dissolved humic, carbonic and nitrous acids Connate water Ancient sea water which was trap in the sediment during burial Differs from seawater both in concentration of dissolved salt and pH, 04 Types of GW (cont.) Juvenile water Primary of magmatic origin Brought to near ᾶ surface environment dissolved in magma Usually mixed with either connate or meteoric water Mixed water Results from the commingling of meteoric, juvenile and connate waters Usually between the near – surface meteoric water, juvenile and the deeper, more saline connate water 1.1 ᾶ Chemistry of ground water Connate water, meteoric water and mixed water can be differentiated on the basics of their chemistry Way can be done: First: Eh: Oxidation/reduction potential and pH: Measure of acidity or alkalinity of the water Eh >0: Considered to be oxidizing