DHI WorldWide nr. 2 2007

A newsletter on water, environment & health

No. 2 2007

DHI utvider kapasiteten

Den 14. mai kunne vi ønske Halvor Hardang velkommen som ny medarbeider i DHI. Halvor er utdannet Sivilingeniør fra Universitetet for miljø og biovitenskap på studieprogram for tekniske fag, linje vann- og miljøteknikk denne våren. Han har kontorplass på drammenskontoret og vil i første reke arbeide med prosjekter innenfor vann- og avløpsfeltet. Du kan lese mer om Halvor her.

Tema for dette nummeret av DHI WorldWide er flommodellering. Et prosjekt fra Boulder Creek i Colorado, USA hvor MIKE 21 er benyttet for å simulere flomsoner kan du lese mer om nedenfor. vrig stoff inkluderer blant annet sanntids reservoaroptimalisering og effekt av klimaendring på danske vassdrag.

Til slutt vil vi ønske våre lesere en riktig god sommer! God lesning!

Boulder Creek - nyskapende bruk av flommodellering ved beredskapsplanlegging

Hensikten med modelleringen

å forutse utstrekningen og tidspunktet for flommen er kritisk i beredskapsplanlegging i sammenheng med plutselige flommer. I denne sammenheng har Urban Drainage and Flood Control District (UDFCD) i samarbeid med City of Boulder og DHI utarbeidet en 2-dimensjonal (2D) modell av vassdraget Boulder Creek ved hjelp av modelleringsverktøyet MIKE 21. En 2D modell ble valgt for å forenkle etableringen av modellen og bedre mulighetene for resultatpresentasjon. ”En 2D-modell kan utvikles fort og med mye mindre ressurser enn en 1D-modell, gitt at egnede topografiske data er tilgjengelige.” sier Chad Kudym fra UDFCD.

Målet med modelleringen er å forsyne UDFCD med statiske flomkart, transporttid for utbredelsen av flombølgen og flomanimasjoner for Boulder Creek, basert på modellresultatene fra MIKE 21. Flomkartene og flomanimasjonene ble brukt til illustrative formål under en øvelse som testet nødberedskapen i en øvelse i Boulder.

Metode

Prosjektet bestod av to overordnede oppgaver, hydraulisk modellering og resultatpresentasjon. Modellens batymetri ble etablert ved hjelp av en eksisterende digital terrengmodell, mens modellens utstrekning ble etablert basert på innspill fra UDFCD. Modellens område strekker seg fra tilnærmet 800 meter oppstrøms Orodell til Canyon Park. Dette representerer en strømningskanal på tilnærmet 16 km. Modellens utbredelse er vist på figur 1 nedenfor. Seks lokaliseringer for innstrømning og korresponderende dynamiske flomhydrografer ble brukt. Flomhydrografene og innstrømningslokalitetene ble spesifisert og anskaffet av UDFCD.

Figur 1 : Flommodellens utbredelse

Kart som viser områder utsatt for flom, maksimum flomdybde og 2D animasjoner av oversvømmelsen ble utarbeidet basert på resultatfilene fra den hydrauliske modelleringen og simuleringen. Disse kartene og animasjonene ble brukt som hjelpemiddel i etableringen og testingen av en beredskapsplan.

Figur 2 : Utvalgt flomfarekart

”Animasjonene og de forberedte kartene var ekstremt nyttige for forståelsen for hvilke områder som var utsatt for flom og transporttiden til fronten av flommen” sier Chad Kudym.

Resultater

Kudym fortsetter ”Flommodellering for beredskapsplanlegging er ganske annerledes enn for kartlegging for forsikringshensyn. Hovedmålene ved modellering for beredskapsplanlegging er fornuftige estimater av oversvømte områder og responstid, mens man holder kostnadene for modellutviklingen på et minimum. Ved å bruke en 2D-modell slipper man å bruke mange timer på å utvikle modellens geometri og å definere flomveier og flomdelinger. Alt dette ble tatt direkte fra den spesifiserte topografien. Ved å benytte et verktøy som MIKE 21, kunne vi raskt etablere representative flommodeller for beredskapsplanlegging til en lav kostnad.”

For mer informasjon om prosjektet, eller for å diskutere hvordan MIKE 21 kan tilpasses dine flommodellerings- eller beredskapsplanleggingsbehov, kontakt gjerne Tomas Eidsmo ( tomas.eidsmo@dhi.no ) eller Eric Fontenot ( ejf@dhi.us ).

Worldwide

DHI launches new technology for real-time dam optimization, South Africa

DHI launches new technology for real-time dam optimization

DHI has developed a new real-time dam optimization technology, which provides operators of dams and reservoirs with the unique opportunity to manage available water resources safely and efficiently. The new system is designed to optimize water resources systems in real-time, taking into account multiple - often conflicting – objectives.

Click here to read more.

Optimisation of groundwater well field pumps

Pump scheduling at larger groundwater well fields is often based on experience and rather simplistic approaches. Hereby the water works is able to supply the amount requested by the consumers – but not at the lowest price possible.

Click here to read more.

Climate change impacts in Danish rivers

Photo: Hans Thodsen

During the last 4 years the Danish research project CONWOY has examined the influence of climate changes on the aquatic environment including river systems and the transport of nutrients. The MIKE 11 Rainfall-Runoff module (RR or NAM ) has been used in combination with empirical models in examining the influence of changed hydrological patterns on the transport of diffuse nitrogen and phosphorus. The empirical models distinguish between if the river flow origins from surface-near surface flow or base flow. The HIRHAM regional climate model, projects wetter winter and dryer summers for Denmark in a future climate scenario period 2071-2100 compared to the period 1961-2000. This results in larger amounts of winter surface-near surface runoff in the future scenario period. As the top soils are enriched with nutrients the surface-near surface runoff holds higher nutrient concentrations than the base flow, the river nutrient concentrations are therefore shown to increase up to 50% during winter months, and up to 20% on the mean annual scale.

WASY

DHI has acquired all the shares of WASY GmbH, Institute for Water Resources Planning and Systems Research, Germany .

WASY GmbH is undisputedly one of the global leaders within groundwater software and information systems. WASY is the producer of state-of-the-art groundwater software products, including FEFLOW, the leading finite element groundwater modelling package in the world. With this merger, DHI is strengthening its product family, expertise and activities particularly within the groundwater field worldwide and adding about 50 highly competent professionals to the staff

Click here to read more.

DHI Women's Water Fund - advancing career opportunities in water management

The DHI Women's Water Fund has been created as an initiative benefiting from the “King Hassan II Great World Water Prize” presented to Prof. Torkil Jønch Clausen of DHI at the Fourth World Water Forum in Mexico in 2006. The objective of the DHI Women's Water Fund is to support women in developing countries in advancing their career opportunities in the development and management of water resources.

The first call for applications earlier this year yielded a number of highly qualified candidates. In the selection process the Board gave priority to applicants with some years of practical experience in water resources management, rather than applicants with mainly academic or strictly technical backgrounds. The Board also prioritized applicants with a current leadership or management position in government, NGO or private sector with a potential to develop further in this role through support to career development.

Based on the above criteria the Board decided to award five grants to women from Iran , India and Armenia .

Next call for applicants is expected early 2008.

For further information please contact Ms. Winnie Thrane (wwt@dhigroup.com)

REACH has come into force

From Friday 1 June 2007 EU's new chemical legislation, REACH, applies in all of EU. The regulation is available on EU's website.

Click here to read more.

DHI has won a contract with the ESA funded MarCoast Project

MarCoast (Marine & Coastal Environmental Information Services) is a three year GMES (Global Monitoring for Environment and Security) project funded by the European Space Agency (ESA) with the aim of establishing a durable network of marine and coastal information services.

Click here to read more.

Courses

DHI Water & Environment Sets Increased Focus on Training, Capacity and Institution Building - Courses Around the Globe!

For a number of years DHI Water & Environment and its international subsidiaries have offered a variety of courses worldwide within water and environment. The courses range from short and intensive standard software and vocational training courses to dedicated, specialised training matching individual clients' specific needs and requests.

Our training activities aim to

Make state-of-the-art technology easy to understand
Combine advanced theoretical knowledge with practical experience
Provide practical skills for problem solving

Alone in 2006 more than 150 standard software courses were held internationally in, amongst others, Australia, Bangladesh, Czech Republic, Denmark, France, Germany, India, Italy, Japan, Malaysia, New Zealand, Norway, People's Republic of China, Poland, Singapore, Spain, Sweden, Thailand, United Arab Emirates, the United Kingdom and USA. Course participants included significant representatives from governmental bodies, regional and local water bodies, research institutions and universities, professional bodies and engineering companies, harbour and coastal authorities, urban water utilities internationally. The "International Software Course Calendar" offers already now more than 200 courses to be run by our international offices in 2007.

We trust and believe that our focus on training and capacity building contribute to the sustainable development of water bodies worldwide and the development of more socially and environmentally sustainable water management strategies and global partnerships.

For further information on DHI Water & Environment course and training activities please contact DHI International Course Secretariat (courses@dhigroup.com) or consult our websites:

Vocational training:
http://www.dhigroup.com/Consulting/VocationalTraining.aspx

Software training:
http://www.dhigroup.com/Software/Training.aspx

Kontakt

Kontakt - Norge

Trondheim
DHI
Abels gate 5
7030 Trondheim
Tlf: 73 54 03 68
dhi@dhi.no
www.dhi.no

Drammen
DHI
Grønland 68A
3045 DRAMMEN
Tlf: 32 80 79 31
dhi@dhi.no
www.dhi.no