 |
| Titel |
Impact of the Hoa Binh dam (Vietnam) on water and sediment budgets in the Red River basin and delta |
| VerfasserIn |
V. D. Vinh, S. Ouillon, T. D. Thanh, L. V. Chu |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 10 ; Nr. 18, no. 10 (2014-10-10), S.3987-4005 |
| Datensatznummer |
250120492
|
| Publikation (Nr.) |
 copernicus.org/hess-18-3987-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| The Hoa Binh dam (HBD), located on a tributary of the Red River in Vietnam, has a
capacity of 9.45 × 109 m3 and was commissioned in
December 1988. Although it is important for flood prevention, electricity
production and irrigation in northern Vietnam, the Hoa Binh dam has also
highly influenced the suspended sediment distribution in the lower Red River
basin, in the delta and in the coastal zone. Its impact was analysed from a
50-year data set of water discharge and suspended sediment concentration
(1960–2010), and the distribution of water and sediment across the nine
mouths of the delta was simulated using the MIKE11 numerical model before and
after the dam settlement. Although water discharge at the delta inlet
decreased by only 9%, the yearly suspended sediment flux dropped, on
average, by 61% at Son Tay near Hanoi (from 119 to
46 × 106 t yr−1). Along the coast, reduced sedimentation
rates are coincident with the lower sediment delivery observed since the
impoundment of the Hoa Binh dam. Water regulation has led to decreased water
discharge in the wet season (−14% in the Red River at Son Tay) and
increased water discharge in the dry season (+12% at the same station).
The ratios of water and suspended sediment flows, as compared to the total
flows in the nine mouths, increased in the northern and southern estuaries
and decreased in the central, main Ba Lat mouth. The increasing volume of
dredged sediments in the Haiphong harbour is evidence of the silting up of
the northern estuary of Cam–Bach Dang. The effect of tidal pumping on
enhanced flow occurring in the dry season and resulting from changed water
regulation is discussed as a possible cause of the enhanced siltation of the
estuary after Hoa Binh dam impoundment. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|