Mangrove Wetlands
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•Reservoirs, weirs, sabo dams, and embankments are utilized to ensure water resources and flood protection in Taiwan. However, the disruption of the river corridor and sediment delivery caused by those river engineering works usually induce the consequent degradation of the downstream estuary and coastal zone, which are the main concern of an impaired land conservation function. Moreover, sea-level rise can threaten the coastal communities and valuable ecosystems such as mangrove forests. •Mangrove forests have the capacity to keep pace with sea-level rise and to avoid inundation through vertical accretion of sediments, which allows them to maintain wetland soil elevations suitable for plant growth. The massive root system of mangroves has proved to be conducive to the coastal protection by dissipating wave energy and thus stabilize its environment. |
•We have established the fundamental data on the degree of river natural capacity and the impact of river engineering on mangroves. The concepts of “ecosystem functions and services” and "integrated watershed management" were considered, particularly on the functions of "hydrological regulation" and "erosion protection".
•The objectives of this research are: (1) quantifying the mangrove contributions on Eco-DRR for sufficient flood and storm surge reduction, and sediment siltation, (2) quantifying the evolution of tidal creeks and tidal mudflat and identifying the landscape structure and dynamics, and habitat characteristics, (3) examining the mechanisms of spreading and exchanging for mangrove seedlings based on hydrodynamic aspect.
•The objectives of this research are: (1) quantifying the mangrove contributions on Eco-DRR for sufficient flood and storm surge reduction, and sediment siltation, (2) quantifying the evolution of tidal creeks and tidal mudflat and identifying the landscape structure and dynamics, and habitat characteristics, (3) examining the mechanisms of spreading and exchanging for mangrove seedlings based on hydrodynamic aspect.
Mountain Wetlands
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•The hydrological condition is one of the most critical driving forces on the aquatic ecosystems of mountain wetlands. The Menghuan Lake in Yangmingshan National Park is the only natural habitat of endemic plant species Isoetes taiwanensis in the world. •The population of Isoetes taiwanensis was found to be hightly sensitive to water level fluctuation. Historical records revealed the fewer rainfall in spring and summer resulting in lower water levels, indicating the occurrence of environmental stress for Isoetes taiwanensis growth and competition. •At present, the water budget model has been developed and concluded the importance of estimating the amount of atmospheric, surface water and groundwater. |
•The ratio of the outflow to the total lake water loss is between 27% and 54%, indicating that the groundwater plays the major role of water loss. The outflow is the main loss item in the overall hydrological income and expenditure.
•Through the introduction of the tracer in the groundwater observation wells, it is confirmed that the water of the lake can enter the groundwater flow through infiltration or leakage. and it will be drained along the fracture.
•Through the introduction of the tracer in the groundwater observation wells, it is confirmed that the water of the lake can enter the groundwater flow through infiltration or leakage. and it will be drained along the fracture.
Constructed Wetlands
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•Nowadays, rehabilitation of wetlands gets renewed attention, especially in the hydraulic design of constructed wetlands, owing to the declaration of Wetland Conservation Act since 2013 in Taiwan. •FWSs are widely used as low-cost alternatives to conventional tertiary municipal wastewater treatment worldwide. They play important roles in the reduction of nitrogen concentration, removal of particulates through sedimentation and removal of organic contaminants through biodegradation. •WSs are also beneficial for promoting biodiversity by providing habitats for plants and animals that have an affinity for aquatic environments. The treatment efficiency of these systems is strongly related to the flow pattern and hydraulic residence time. |
•Our research aims to effectively simulate flow conditions and calculate wetland hydraulic loading, hydraulic retention time, effective volume ratio, and hydraulic efficiency, which are the most critical parameters when designing FWSs. Tracer technology with the conductance of numerical simulation and flume experiments were employed.
Ecosystem-based Disaster Risk Reduction (Eco-DRR)
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•River flooding is one of the major hazards in Taiwan due to the dense population living along the riverside. The Taipei metropolitan area is the largest city with more than one-third of the total population of Taiwan. In this area, numerous severe flooding disasters caused by typhoon events have occurred and resulted in heavy losses. The Taipei Flood Prevention System are effective in mitigating flood disasters, although the function of flood prevention might be changed over time by urban development and multiple demands of the usage of floodplains. •This project aims to examine anthropogenic effects on the major region of the Taipei Flood Prevention System using numerical model simulations by incorporating field surveys. |
•Several scenarios such as river excavation and partial plant removal on floodplain were setup and simulated. Structural and non-structural measures are provided and assessed in the perspectives of ecological services and ecosystem-based disaster risk reduction (Eco-DRR).
•We utilize the Eco-DRR approach by investigating the factors of ecology, environment, landscape and socioeconomic that influence the capacity of the flood defense to examine the flood mitigation strategies. In our study, we strive to understand the causes of flooding and the response of flood-defense systems to multiple stressors through field surveys, numerical models and interdisciplinary approaches. We also address people’s social, economic and cultural realities within the context of the goods and services provided by ecosystems through communication and public participation. To this end, our research links the human needs and ecosystem conservation.
•We utilize the Eco-DRR approach by investigating the factors of ecology, environment, landscape and socioeconomic that influence the capacity of the flood defense to examine the flood mitigation strategies. In our study, we strive to understand the causes of flooding and the response of flood-defense systems to multiple stressors through field surveys, numerical models and interdisciplinary approaches. We also address people’s social, economic and cultural realities within the context of the goods and services provided by ecosystems through communication and public participation. To this end, our research links the human needs and ecosystem conservation.
