Combined assessment and regulation on ecological land use and water demand of the river system: a case study in Luanhe River, North China

D. H. Yan, G. Wang, H. Wang, T. L. Qin
2011 Hydrology and Earth System Sciences Discussions  
With economic and social development, ecological water and land use of the river system were seriously misappropriated, which resulted in overall degradation of the river systems. In this study, theoretical and technical frameworks of regionalisation on the eco-environmental function of the river systems were preliminarily formulated. Accord-5 ing to the river eco-environmental functions, Luanhe River was regionalised into four types of first-class functional areas, i.e., ecological
more » ... areas, habitat restoration areas, ecological buffer areas and development and utilisation areas. Combined with the main functions of all functional areas, ecological land use of the river system in Luanhe River was assessed and planned. The total area of basic ecological land 10 use was 876.98 km 2 ; that of restrictive ecological land use was 1745.52 km 2 ; that of ecological land use of the river system returned from farmland was 284.25 km 2 ; and that returned from construction land was 17.35 km 2 . Combined with prototype observation experiments, the average minimum ecological flow of mainstreams in upper and middle reaches of the Luanhe River was 4.896 m 3 s −1 with the habitat method. The 15 evaporation and seepage consumption of the river system in Luanhe River and vegetation consumption in riparian zones were about 133 million m 3 and 145 million m 3 per year, respectively. Downwards from the Panjiakou-Daheiting Reservoir system, the mainstream of the Luanhe River was the crucial reach for regulation on instream ecological water use. It was required to speed up ecological land use planning of the 20 river system and strengthen the regulation of ecological water use in important lower reaches of the Luanhe River under the condition of competitive water demand. 8, 2011 9230 HESSD
doi:10.5194/hessd-8-9229-2011 fatcat:ohvyx26merbaxgdlfv7ehmagu4