Abstract. Rivers are drying up most frequently in West Liaohe River plain and the bare
river beds present fine sand belts on land. These sand belts, which yield a
dust heavily in windy days, stress the local environment deeply as the
riverbeds are eroded by wind. The optimal operation of water resources, thus,
is one of the most important methods for preventing the wind erosion of
riverbeds. In this paper, optimal operation model for water resources based
on riverbed wind erosion control has been established, which contains
objective function, constraints, and solution method. The objective function
considers factors which include water volume diverted into reservoirs, river
length and lower threshold of flow rate, etc. On the basis of ensuring the
water requirement of each reservoir, the destruction of the vegetation in the
riverbed by the frequent river flow is avoided. The multi core parallel
solving method for optimal water resources operation in the West Liaohe River
Plain is proposed, which the optimal solution is found by DPSA method under
the POA framework and the parallel computing program is designed in Fork/Join
mode. Based on the optimal operation results, the basic rules of water
resources operation in the West Liaohe River Plain are summarized.
Calculation results show that, on the basis of meeting the requirement of
water volume of every reservoir, the frequency of reach river flow which from
Taihekou to Talagan Water Diversion Project in the Xinkai River is reduced
effectively. The speedup and parallel efficiency of parallel algorithm are
1.51 and 0.76 respectively, and the computing time is significantly
decreased. The research results show in this paper can provide technical
support for the prevention and control of riverbed wind erosion in the West
Liaohe River plain.
A STUDY OF THE ECOLOGICAL PATTERNS OF FARMING-PASTORAL ZONES IN SEMI-ARID REGIONS: USING THE WEST LIAOHE RIVER PLAIN OF CHINA AS AN EXAMPLE
