| Summary: | 碩士 === 國立海洋大學 === 河海工程學系 === 85 === In recent years, due to rapidly industrial and commercial
development, water demand increases dramatically. Nowadays,
water shortage problem becomes the key issue in nation''s
economical development projects. For sustainable development of
water resources, carrying capacity of water environment has to
be considered in regional development planing. It indicates that
future water management has to be shifted from supply-side to
demand-side. The main purpose of this study, is to explore
carrying capacity of a water environmental from the view point
of water resource. The methodology of the study could be divided
into four main stages as follows: the definition of water
resource carrying capacity, estimation the potential of surface,
subsurface and baseflow, examination the content of
environmental water uses, and calculation the reliability of
water resource carrying capacity for the maximum population
equivalent in the regional development. Chung-Kaung Chi basin is
chosen as the study area. Potential surface water is evaluated
based on flow duration curve (FDC), and mean annual flow is
estimated by Chow''s formula. For those ungauged stations,
dimensionless FDC can be used. At the outlet of the Chung-Kaung
Chi basin, it is estimated that mean annual surface flow and
coefficient of variation (COV) are 2.63and 0.1825 respectively.
For baseflow estimation, concept adopted from Linsley (1982) and
Tzou (1996) is used to carry on baseflow separation. It''s
estimated that mean annual baseflow and COV at outlet of the
basin are 0.34 and 0.3294 respectively. Both ground water
hydrograph (GWH) and cumulative rainfall departure (CRD) methods
are used to estimate annual recharge. It indicates that GWH
method is better than CRD method in accuracy. Hence, GWH is used
and it shows that mean annual ground water recharge and COV at
the outlet of the basin are 1.58 and 0.3139 respectively. Also,
the relationship between annual rainfall and recharge is
established. Furthermore, recharge depth isopleths for the basin
are constructed. Because environmental water use is still
disputable, so have one to three times of fishery water use
(Tennant,1975) instead.In the reliability analysis of water
resource carrying capacity, all water resources (surface,
subsurface, and baseflow) are treated as normal and lognormal
distribution. From the results, they show that reliability of
water resource carrying capacity for the optimum land-used
allocation (with water demand = 17,763,236) reaches 100%. If
different degree of water resources development and
environmental water use are considered, reliability reduces
obviously and optimum land-used will be changed.
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