Modeling Approach towards Eco-Restoration Strategies for the Polluted Tributaries of the Brahmaputra River System

Pathak, N.; Girija, T. R.; Mahanta, Chitralekha

doi:10.1061/40927(243)594

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…Since hydrologic and environmental aspects are all interconnected, it is essential to establish a systematic and integrated stream restoration system [9]. Lack of concern for conservation of the ecosystem and preservation of the pristine water system caused the negative effects on most of the stream restoration, such as flow changes to the physical ecosystem in river [10] and environmental change to water quality and aquatic habitat [11]. Despite growing interest in integrated restoration, few cases of restoration met all the objectives of ecological, environmental, hydraulic, and hydrologic restoration [12,13].…”

Section: Introductionmentioning

confidence: 99%

Development of Sustainable Integrated Design Framework for Stream Restoration

Park

Lee

2019

Sustainability

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This study analyzed the elements of previously published stream restoration guidelines by clarifying the definition of stream restoration classified for various purposes. The purpose of this study was to establish a sustainable integrated design framework for stream restoration that supplemented the limited scope of application and the resulting problems. Stream restoration procedures were established using the method of securing water resources applied with the integrated watershed management in order to effectively and feasibly recover the modified stream, to resolve the water shortage problem, and to effectively restore the ecosystem due to climate change. An 11-step stream restoration procedure was established in three phases including the pre-restoration design phase, the restoration design phase, and the detailed design phase. Furthermore, the three stages were classified into hydrologic and hydraulic plan, geomorphic and sediment transport plan, and ecological and environmental plan depending on the direction of stream restoration, and the procedure for stream restoration was proposed to prevent river restoration from being biased toward a specific goal. An integrated design framework for stream restoration could be established by allowing the proposed stream restoration design procedures (e.g., three phases and three plans) and the elements to be carried out using numerical models for an effective design in establishing river restoration plans. Lastly, it was possible to quantify the problems of existing stream restoration by applying this stream restoration framework to the existing river restoration project and guideline report. As a result, the existing stream restoration project could be used as base data that could provide directions to supplement the weaknesses of the existing stream restoration project and provide directions for the new river restoration projects in the future.Keywords: integrated watershed management; 11-step stream restoration procedure; pre-restoration design phase; restoration design phase; detailed design phase; hydrologic and hydraulic plan; geomorphic and sediment transport plan; ecological and environmental plan

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Section: Introductionmentioning

confidence: 99%

Development of Sustainable Integrated Design Framework for Stream Restoration

Park

Lee

2019

Sustainability

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“…River management projects all over the world, such as channel modifications and channel adjustments, typically focus on only hydraulic engineering practices that are designed to supply water and prevent flooding. In general, a lack of concern for conservation of the ecosystem and preservation of pristine water systems has resulted in these projects changing the physical habitat of rivers [1][2][3][4] and environmental conditions, which has adversely affected water quality [2,3,5] and thereby hampered the ecosystem and the quality of aquatic habitat. Accordingly, stream restoration attempts and related endeavors in the last two decades have focused on two related aspects: (1) rehabilitation of the ecological condition of urban streams that have been affected by ecological degradation and (2) preservation of integrity of the ecosystem and the environmental system.…”

Section: Introductionmentioning

confidence: 99%

Use of Instream Structure Technique for Aquatic Habitat Formation in Ecological Stream Restoration

2018

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Drought flow as the minimum flow rate required for restoration of the Mokgamcheon stream was calculated by the Storm Water Management Model (SWMM) V.5.0. The adequacy of drought flow to guarantee the minimum ecological environment was assessed using suitable low-flows not exceeding the maximum pollution concentration of the ecosystem calculated by Design FLOWs (DFLOW) V.4.1. Fish flows, which provide proper ecological habitat for fish, were calculated using Physical HABitat SIMulation (PHABSIM) V.1.5.2 to provide proper ecological habitat for target fishes such as Carassius auratus and Zacco platypus. The monthly expected instream flows were determined as the largest value between drought flow and fish flow. In most cases, instream flows were determined by drought flows exceeding fish flows that satisfy the condition of species habitat, but in the case of Carassius auratus, drought flows were less than fish flows in April, September, and October. Thus, structural measures for the supply of additional discharge were required. Instead, when natural environment-friendly instream structures, such as stepping stones were used, affordable ecological restoration that met the preferred conditions for discharge and depth of Carassius auratus was possible. The stepping stones were assessed using River2D V.0.95a to measure their effectiveness compared to other structural measures that would be costly and time-consuming to secure shortage of fish flow. Finally, the stability of the habitat was assessed through flood analysis; in case of a flood discharge of 5.2 m3/s obtained from time-series analysis, it was evaluated that the stability of habitats could be reasonable.

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