Abstract
The whole functions of the ecological system of Dalian Lake wetland include the hydrologic regulation function, water quality purification function, substance production function and wetland tourism, etc. The main mechanism of the wetland system to control the non-point source pollution is to increase the runoff infiltration, delay runoff flow, increase dwelling time, etc., and then make pollutants detain in the system to decompose and transform, and finally reduce the pollutant loads from going into the downstream water body; meanwhile, the rainfall runoff intercepted shall be recycled, which can improve the utilization ratio of water sources and relieve the scarce water source. When designing the wetland system for controlling the non-point source pollution, it is needed to consider the characteristics of rainfall runoff (rainfall strength, rainfall duration, rainfall time interval, etc.), wetland dewatering time, drought tolerance of plants, transpiration and other factors so as to make the structure and functions of wetland fit to the randomness and rapid change of rainfall. The load of unit area affects the degradation efficiency of the wetland on pollutants; the improper design can make wetland system unworkable; in other words, the primary issue of the design work is to determine the pollution load of wetland area (currently it is needed to determine the pollutant reduction objective of wetland in accordance with the pollution source investigation result, and then obtain the pollution load of wetland area). In a wetland, the degradation extent of pollutant is related to its dwelling time; whereas the dwelling time is inversely proportional to the unit area’s load of wetland. The non-point source pollutant, retention rate of runoff and runoff process, dwelling time, water depth, etc. have close relation; however, the dwelling time of the runoff in the wetland system is controlled by the runoff inflow process.
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© 2014 Science Press, Beijing and Springer-Verlag Berlin Heidelberg
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An, S., Wang, L. (2014). Wetland Restoration Strategy. In: Wetland Restoration. Springer Environmental Science and Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-54230-5_5
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DOI: https://doi.org/10.1007/978-3-642-54230-5_5
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