MESOSCALE PERSPECTIVE OF ENVIRONMENTAL FLOW ASSESSMENT IN THE MIDDLE REACH OF SEKAMPUNG RIVER, INDONESIA
DOI:
https://doi.org/10.11113/aej.v15.23884Keywords:
environmental flow, mesoscale, natural river, average reciprocal distance, wetted perimeter methodAbstract
Minimum environmental flow (E-flow) is a river discharge that is essential to maintain the environmental capacity along the river and support its ecological systems. A mesoscale approach is critical for a more focused understanding of river dynamics within the affected river reach. This paper discusses the mesoscale perspective of E-flow studied on the middle reach of a natural river, Sekampung in Indonesia. The wetted perimeter method was used to assess the minimum environmental flows at both the upstream and the downstream sides of the concerned reach of the river. An analytical approach was also used as a comparative method. The Average Reciprocal Distance (ARD) approach was used to obtain the E-flow at the specific site within the reach. Based on the mesoscale approach, a minimum E-flow of between 2.5 m3/s and 3.6 m3/s was obtained for the upstream and downstream boundaries, respectively. Using the ARD method, a minimum E-flow of 2.6 m3/s must be provided at the new Sekampung Dam site. The water use and river dynamic nexus need to be further studied to make an integrated decision regarding the E-flow along the mesoscale boundaries.
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