The Huong River – the nature, climate, hydro-meteorological issues and the AWCI demonstration project

National Centre for Hydro-Meteorological Forecasting (NCHMF), NHMS of Vietnam Dr.Dang Ngoc Tinh

7th GEOSS AP Symposium, the AWCI parallel session

May 27, 2014, Tokyo

1. Briefing on the Huong river basin Total area of the Huong basin is 2830km2, representing 56% of the total area of the Thua Thien Hue province. The river forms a central part of the economic and social development of the province , with many people depending on it for their livelihood.. With the area 22,000 ha, the Tam Giang-Cau Hai Lagoon is recognized as a particularly valuable asset and an important part of the life of its many users. The main issues associated with the Huong River Basi are flooding in the rainy season and saline water intrusion in the dry season.

Hydro-Meteorological Observation system 10 rain gauge stations and 6 water level measurement stations, some of local stations. In flood season available 6-hourly rainfall

and water level data from these stations, report 4 times/day. In flood situation: 1-hourly data from these stations.. There is no water quality observation at these stations.

Hydro-Meteorological Network in Thua Thien Hue Province

Runoff in flood season from October to December consists of 70 – 75% total annual runoff, while

dry season lasting 9 months, including the period of early small floods in May – June, has only 25 – 30% total annual runoff

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TaTrach River at ThuongNhat (1981-2007)

HuuTrach River at BinhDien (1976-2007)

Bo River at CoBi (1977-2007)

Observed monthly multi-years average discharge (m3/s)

In the dry season, there are 2 driest period: from March to April and from July to August. The lowest monthly flow is April.

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Ta Trach -Thuong Nhat

Bo - Co Bi

Huu Trach - Binh Dien

Monthly multi-year average runoff distribution in dry season on main rivers of the Huong river basin

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MC

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At the present, to response to flooding and saline water intrusion, number of control structures has been constructed as reservoirs like Co Bi, Ta Luong, Truoi, Ta Trach, Huu Trach, A Luoi as

well as barriers to prevent saline water intrusion, the most notable of which is the Thao Long Barrage. These structures strongly have change hydrological regime of the Huong river basin.

A Luoi Reservoir

2. The AWCI demonstration project Spatial distribution of TRRM

3000-3500 mm/yr, Rainy season: Oct-Nov

Application of Satellite Data for the Vietnamese River Systems

Calibration of the DHM with satellite rainfall data at Kim Long St. – Huong River

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Raingauge Observed TRMM HRM GPV

Application of Satellite Data for the Vietnamese River Systems 24-30 November Simulation

01000200030004000500060007000

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Gauge Obs TRMM HRM-6hr GPV

Difference due to overflow during Inundation

Application of Satellite Data for the Vietnamese River Systems

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At Kim Long Station – Huong River (Sour: University of Tokyo)

Other activities of the Huong River Basin Demonstration Project + Joint Vietnam-Japan Workshops on Sustainable Water Management in Hue city, Vietnam, March 9-10, 2009 and in Tokyo, 2012 + Finished data uploading, verified for period from 2004 to 2010 + Simulated hydrograph for period Oct. 9 – Nov.5, 2008 and forecasted hydrograph for period Aug. 21 – Sep.5, 2009 using distributed model GBHM (Geomorphology-based Hydrological Model – University of Tokyo) and High Resolution Model (HRM, Vietnam): - Made some modification of GBHM in sources code for running from month to month, read HRM forecasted rainfall input file in ASCII format. + Improvement of warning flood forecasting system for the Huong river using DHM with satellite data and numerical weather forecasts, including reservoir operations. Dr. Oliver Saavedra and his team (Tokyo Institute of Technology + Climate change impact assessment to the Huong river water resources

Observed and forecast hydrographs at Kim Long station(10/9/2008 - 11/05/2008)

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1 24 47 70 93 116 139 162 185 208 231 254 277 300 323 346 369 392 415 438 461 484 507 530 553 576 599 622 645 668

ObserveOb RainfallHrm Rainfall

Observed and forecast hydrographs at Kim Long station (08/21/2009 - 09/05/2009)

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forecast Observed

Highest 20 Rank of Daily Discharge

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0100020003000400050006000700080009000

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Huong Preliminary Q Comparison 5 GCM Models from CMIP3

Average Daily Discharge for each

month (Climatology)

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GISS (1981-2000)

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MIUB (1981-2000)MIUB (2046-2065)

Thank you for your kind attention!