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Prioritization of sub-watersheds for the application of environmental policies in the Basin of Lake Cuitzeo
D. González. and M. Mendoza
CIGACENTRO DE INVESTIGACIONES
EN GEOGRAFÍA AMBIENTAL
Lake Cuitzeo Basin is an important ecologic area, where is a strong pressure on the natural resources by the productive activities.
Its necessary the implementation of the environmental programs to keep the equilibrium among the productive activities and natural resources. (conservation and sustainable use territorial policies)
It becomes necessary to identify and recommend to the authorities which are the priorities areas to apply the environmental programs
Background
Objective
Identify the priority water-sheds for the implementation of selected environmental policies to support sustainable development in the Lake Cuitzeo Basin
Study site
Spot image 321, Dec 2006
•Center of Mexico•Michoacan state•4,000 Km.2
•Transmexican Volcanic Belt•Lake Cuitzeo (Ecological importance)•55 watersheds•28 Municipalities•Urban expansion•High migration rates
MethodObjective of
environmental policies
Definition of ideal areas for the
application of conservation and sustainable use
policies
Partial Valuation
Partial Valuation Literature review
Construction of the criteria tree structure in the SMCE
module in ILWIS 3.3.
Establish the relative importance of criteria(Pairwise comparison)
Establish the relative importance of criteria
Aggregation in the municipalities
Rank order of the municipalities for
each policy
Definition of new criteria structure for each policy
for the choice phase
Problem formulation Assessment of the municipalities Ranking of the municipalities
Definition of relevant criteria
Definition of constraints
Construction of the indicators to asses the sub-
objectives
SMCE
Evaluate the overall Results
SMCE
Composite suitability index map for each policy
Evaluation of municipalities for each policy
Assessment of sub-watersheds Ranking of sub-watershedsFormulation
Assessment of sub-watersheds
Aggregation in sub-watersheds
According to the local environmental law, the main objective for the application of the environmental policies are:
Conservation
To preserve the environmental elements that allow maintain the environmental services
To minimize the conflicts between the productivity activities and the conservation programs
Sustainable use
Define the areas where the productive programs can be developed according to the distribution of the land capability
To minimize the deterioration of areas containing a well preserved natural capital
Concerned policies
Find criteria to asses the objectives1. Find criteria, it should be:Relevance
• be related to the assessment goal• be sensitive and responsive to change in the system.
Analytic• be theoretically founded,
Measurable• be easy to detect, record, and interpret• be cost effective• be precisely-defined
Continous variables
Discrete variables
2. Standardization.
•Maximum•Interval•Goal
•Pairwise comparition•Rank order
Criteria structure for assessing the suitability for conservation policy
Criteria structure for assessing the suitability for the sustainable use policy
Example. Suitability assessment of the municipalities
Forest stability
Stable productive areas
Overall suitability assessment of the sub-watersheds for the conservation
policy (A) and sustainable use (B) Results
Selected criteria for the assessment of the sub-watersheds
Supply-Connectedness of suitability classes -Percentage of cover of the best performance cells per spatial unit.
• Demand- Relative poverty index
Decree- Percentage of area assigned for conservation and sustainable use by the
EMPLCB
Ranking of sub watersheds
• The overall suitability index were assesed through 3 scenarios-Supply, Demand, Decree
• Decision rules were implemented to construct an integrative suitability map map.
Relative importance of criteria in each scenario
Decision rules to classify the integrative suitability map
Potential conflicts in sub watersheds
• Potential conflicts among the implementation of the environmental policies are identified based on the comparison of the suitability indexes for each sub-watershed
Map of potential conflicts among environmental policies by sub-watershed
No conflict 1st orderNo conflict 2ndorder
Mixed 2nd order
Mixed 3th order
Sub-watersheds Municipalites
Total area in percentage by conflict area. Comparison between natural and administrative spatial units
Conclusions• The multi-temporal analysis through a long and a short term of time
allows identifying the trends of the land use change for support the implementation of the environmental policies.
• Three different orientations of the municipalities were identified: 1) Oriented to productive activities, 2) Oriented to conservation activities and 3) Mixed oriented
• The prioritization of the sub-watersheds could be a practical information that can be used as support to planning the implementation and the monitoring of the environmental programs in the framework of the EMPLCB
• Intermunicipal efforts have to be implemented in the framework of Integrated Watershed Management.
Gracias.
Ranking of sub-watershedsConservation policy
Compensatory approach. Weighted summation
Ranking of municipalities
Sustainable use policyCompensatory approach. Weighted summation
Suitability assessment of the municipalities
Relative importance among criteria. Conservation policy
Relative importance among criteria. Sustainable use policy
Suitability assessment of the municipalities