Environmental

Oral

397442 - Study on impact of river management on vegetation dynamics response in a river channel using hydraulic simulation and ecological modeling

Tuesday, June 5
2:00 PM - 3:30 PM
Location: Lakeshore B
Co-Authors: Yuichi KAYABA, River Rerestoratio team – Public Worls Research Insititute

Introduction: Wood overgrowth in river channels degrades the discharge capacity and biodiversity; thus, it is an important river management issue in Japan. Many researchers and river managers have pointed out the degradation of riverbeds due to gravel pits. However, there have been few studies on using numerical modeling and ecological modeling to quantify the mechanism. Therefore, our aim was to conduct quantitative research on the mechanism and discuss operation methods to address overgrowth.

Methods: Simulations of wood overgrowth were conducted for the Chikuma river in central Japan. We considered two cases using a 2D removal river bed simulation and physical-habitat model of the wood: (1) a recurring time series for the river morphology change, revetments and flow discharge, and (2) a recurring time series that only considered flow discharge and not the changes in the river morphology due to a gravel pit. (3) a recurring time series that only considered both flow discharge and revetment, and not the changes in the river morphology due to a gravel pit.

Results
Case 1 resulted in decreased shear stress, which indicates river disturbance and an increase in the suitable area for wood. In contrast, Case 2 resulted in no decrease in shear stress and no increase in the suitable area for wood. Although Deep drilling area occurred around the revetment, Case3 results were approximately similar with Case2 results.

Masatoshi Denda


Public Works Research Institute

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397442 - Study on impact of river management on vegetation dynamics response in a river channel using hydraulic simulation and ecological modeling



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