Estuary Processes and Managment - River Dynamics and Integrated River Management - page 471

have reduced the infiltration capacity of the ground surface (Zhang and Jiang, 2004). To store water
during rain season humans constructed many locks. Nevertheless, the storage capacity of these locks is
limited and these locks have to be open after rainstorms.

N

Panjiakou

0 20 4 0km

Qinhuangdao

Beid aihe

Luanxian
county

Bohai Sea

Tangshan

Bohai Gulf

Fig. 8.8 The Luanhe River and its parasitizing rivers

Fig. 8.9 Discharge hydrograph of Majia River at Liuqiao Station in 2008

Figure 8.10 shows the discharge hydrographs of the Shahe River. The Shahe River is 80 km long, which
is a parasitizing river of the Luanhe River. The Shahe River was an abandoned channel of the Luanhe
River after an avulsion of the delta channel. Flow occurs in the river only in July and August when
rainstorms happen. Because the flood stage rises and falls very sharply and there is no water flow in the
river during dry season the ecology in the river is poor. Weir and lock construction is the strategy to store
water and improve the ecology.