Study on influence of waterway regulation engineering to fish habitat

摘要

As a traditional means of transportation, water transportation has many advantages, such as larger capacity, lesser energy consumption, lower cost and lesser land occupied. In recent years, water transportation in China has been rapidly developing. Among them, waterway regulation engineering plays a very important role in smoothing waterway; ensure waterway security and promoting sustainable economic development. Meanwhile, waterway regulation projects have threatened the ecosystem of rivers. In this paper, the three-dimensional hydrodynamic and sediment transport model (Wang & Geng 2013) combined with fish habitat model (Yi et al. 2014; Yi et al. 2007) are built to simulate the environmental and ecological responses for the waterway regulation engineering. The model was used to perdition the fish habit change by waterway regulation which for improving navigable depth at the Jieshou reach of Xijiang River, China. Figure 2 show the Habitat suitability index of homalopteridae fish, when the river flow is low, normal and flood flow. We compared the habitat area before and after the implementation (Fig. 1). The numerical results show that, waterway regulation increases the diversity of hydrodynamic environment and habitats. The better fish habitat area is increase during drought and flood period, and decrease slightly during middle-flow period.