A spatial aggregation index for effective fallow decision in paddy irrigation demand planning |
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Authors: | Ming-Daw Su Mei-Chun Lin Chun-Hung Lin Shih-Fu Wang Tzai-Hung Wen Hsin-I Hsieh |
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Institution: | (1) Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan;(2) CECI Engineering Consultants Inc., Taipei, Taiwan;(3) Department of Geography, National Taiwan University, Taipei, Taiwan; |
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Abstract: | As irrigation demands usually take the largest share of water supply, paddy fallow is considered as a drought relieving measure
in some Asian paddy growing countries by transferring the water saved to the municipal and industrial sectors. But the relationship
between fallow area and irrigation demand reduction is not necessarily linear, there may be more than dozens combinations
of fallow farm that can meet the same amount of irrigation demand reduction requirement. The Joint Count Statistics (JCS),
an index commonly used in spatial analysis to measure the spatial coherence among cells was modified as a spatial aggregation
index for evaluating the irrigation demand reduction effectiveness from a spatial perspective. This Modified JCS is supposed
to identify the degree of spatial aggregation by taking underlying irrigation network into considerations. The modified JCS
was proved to be effective to identify better fallow pattern through a case study in Taiwan. |
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