Adaptive (re)operations facilitate environmental flow maintenance downstream of multi-purpose reservoirs
arxiv(2024)
摘要
Multi-purpose reservoirs support socioeconomic development by providing
irrigation, domestic water supply, hydropower, and other services. However,
impoundment of water impacts instream aquatic ecosystems. Thus, the concept of
minimum environmental flows (MEFs) was established to restore the benefits of
naturally flowing rivers by specifying minimum flow rates to be maintained
downstream of dams.But varying legislative contexts under which multi-purpose
reservoirs operate may not always necessitate MEF releases. To what extent the
release of MEF affects other sectoral benefits remains an open-ended and
possibly a site-specific inquiry. A related issue is - how does the order in
which releases are prioritized influences sectoral performances? We analyse
these issues for the Nagarjuna Sagar reservoir, one of the largest multipurpose
reservoirs in southern India. We formulate two versions of a multi-objective
decision problem. PF_MEF formulation prioritizes MEF releases over releases for
water demand satisfaction, followed by hydropower releases. PF_nMEF formulation
follows the regional legislative rule releasing first for demand satisfaction,
followed by hydropower and MEF releases. Results thus indicate that
prioritizing MEF releases improves can meet MEF requirements without
significant compromises in other objectives. We hypothesize that similar
investigations may reveal how simple modification of release order may improve
ability of other reservoirs to meet environmental goals.
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