PRINCIPLES OF HYDROLOGY
DEFINITION OF HYDROLOGY:
Hydrology is the science that include
• The physical and chemical processes in the cycling of
continental water at all scales as well as those biological
processes that significantly interact with the hydrologic
cycle,
• The spatial and temporal characteristics of the global
water balance in all compartments of the Earth system
(USA National Research Council)
,DEFINITION OF HYDROLOGY: CONTINUE
• Dooge defines hydrology as the science that
seeks to explain the water balance dynamics for
any defined spatial (from a point to global) and
temporal scale (from seconds to years) and their
relationships with the physical and chemical
transport of matter through the hydrologic cycle
and with ecology (IAHS News letter, 1991).
,• Hydrology is peculiar among the natural sciences in its
dependence upon the findings of other allied sciences.
• These sciences are meteorology, climatology, physical
geography, agronomy, geology and soil science, hydraulics,
oceanography and limnology.
• The hydrologist must have a working knowledge of them all”
• Therefore it can be seen that the classification of
hydrological studies according to climatic regions, tropical,
temperate, polar, arid, humid), surface characteristics
(urban, farmland, forest, lakes) and geology (Karst) follows
naturally from the definition as they all influence the water
balance characteristics of a defined area.
, THE HYDROLOGICAL CYCLE
• Figure 1.1 The Hydrologic Cycle
DEFINITION OF HYDROLOGY:
Hydrology is the science that include
• The physical and chemical processes in the cycling of
continental water at all scales as well as those biological
processes that significantly interact with the hydrologic
cycle,
• The spatial and temporal characteristics of the global
water balance in all compartments of the Earth system
(USA National Research Council)
,DEFINITION OF HYDROLOGY: CONTINUE
• Dooge defines hydrology as the science that
seeks to explain the water balance dynamics for
any defined spatial (from a point to global) and
temporal scale (from seconds to years) and their
relationships with the physical and chemical
transport of matter through the hydrologic cycle
and with ecology (IAHS News letter, 1991).
,• Hydrology is peculiar among the natural sciences in its
dependence upon the findings of other allied sciences.
• These sciences are meteorology, climatology, physical
geography, agronomy, geology and soil science, hydraulics,
oceanography and limnology.
• The hydrologist must have a working knowledge of them all”
• Therefore it can be seen that the classification of
hydrological studies according to climatic regions, tropical,
temperate, polar, arid, humid), surface characteristics
(urban, farmland, forest, lakes) and geology (Karst) follows
naturally from the definition as they all influence the water
balance characteristics of a defined area.
, THE HYDROLOGICAL CYCLE
• Figure 1.1 The Hydrologic Cycle
