A Study On The Drought
Theoretical Framework
In this study, we conceptualize drought propagation as a cascading phenomenon that begins with
rainfall deficits and proceeds through the hydrological cycle as shown in Fig. 2. As the drought
proceeds, its impacts on associated or dependent societal and agro–ecological systems accumulated
(or ensues in worst critical or complex condition) as shown in Fig. 3. Consequently, we have elected
to use the framework of "diseases burden" to elucidate the cumulative drought effects. According to
Begg et al., 2007 and Mathers et al., 2007, disease burden framework is a standardized measurement
framework that permits comparison across diseases and injuries, as well as risk factors.
Fig. 2 proceeding of precipitation deficit ... Show more content on Helpwriting.net ...
But as the drought deepens and soil moisture also becomes deficit, agricultural losses add to the
location's drought problems, leading to moderate droughts. Subsequently, as the drought situation
persists, and rivers, lakes, reservoirs and aquifers become deficit, thereby compounding the drought
problems the more, hydrological drought occurs as shown in Fig.4. With the idea of using disease
burden model to distinguish the drought severity, the integration of the different component
indicators or associated drought indices (i.e. SPI, SDI etc.), to achieve a hybrid composite index, is
conceptualized in this study, as being analogous to the concept of "set theory's" system of
combination of sets, used in the mathematics discipline. Hence, the concepts of disease burden and
set theory are our guiding intellectual frameworks for developing the proposed composite drought
index. The concept of set theory deals with study of set (Weiss, 2008). Intuitively, a set is an abstract
collection, group or aggregate of distinct objects, normally referred to as elements or members,
which may correspond to things in the world or to concepts etc. (Partee, 2006; Young, 2011). In set
theory, the combination of sets are done in three ways, namely by union, intersection and
complement (Young, 2011). In this study, we propose to use combination by union of sets approach,
since other methods may not capture all the elements or properties of various droughts under
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