Evaluating the competition and cooperation between waterbirds habitat conservation of hsinpei wetland and flood control demand
Journal
Journal of Taiwan Agricultural Engineering
Journal Volume
62
Journal Issue
1
Pages
1-11
Date Issued
2016
Author(s)
Abstract
Hsinbei and Huajiang wetlands, located at the confluence of Dahan Creek and Xindian Creek, attract thousands of ducks to visit during September to next April every year. In recent years, the wetlands have been led to a significant terrestrial due to sediment deposition, resulting in a reduction of teals since their habitat preferences could have been negatively affected. The effect also influences the flood diversion of the Erchung Floodway and might increase flood level of the Tanshui River. The horizontal two dimensional model, TABS-2, was employed to simulate the flow condition and to calculate the bypass flow discharge. The habitat suitability index of common teals was used to evaluate the ecological scores. A total of eight sets of simulated scenarios in three categories were designed to compare with the current situation, i.e. “No action”. In category (1), the bypass flow discharge of Scenario 1-1 is slightly greater than that of Scenario 1-2; however, the excavation volume is far greater than that of Scenario 1-2. In light of marginal benefits, Scenario 1-2 should be adopted for this category. In category (2), the bypass flow discharge of Scenario 2-1 is the greatest, followed closely by Scenario 2-2 while that of Scenario 2-3 is the smallest. In category (3), groins are set up across from the Sanchong trash mountain and at the right bank where the Dahan River merges with the Tanshui River. Although the groins raised the bypass flow discharge, they had poor ecological performance. The excavation Scenario 1-2 has the best efficiency and indicates a cooperation relationship between flood control demand and ecological conservation. Our study suggests a practical reference for initialing or revising a river planning of an urban river. © 2018, Taiwan Agricultural Engineers Society. All rights reserved.
Subjects
Common teals; Erchung Floodway; Flood bypass; Habitat suitability
Other Subjects
Ecosystems; Excavation; Flood control; Flowmeters; River diversion; Wetlands; Common teals; Competition and cooperation; Cooperation relationships; Ecological conservation; Ecological performance; Erchung Floodway; Habitat suitability; Habitat suitability index; Floods; flood; flood control; habitat conservation; habitat selection; habitat type; river discharge; river flow; waterfowl; wetland; Dahan River; Danshui River; Taiwan; Anas; Anas crecca
Type
journal article