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R.J.W. van Beek
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Climate change is expected to intensify extreme precipitation events, creating deep uncertainty for long‑term flood risk management in Voerendaal East. This flood‑prone area is located in the hilly landscape of South Limburg in the Netherlands. To address this uncertainty, this research develops adaptation pathways to manage extreme precipitation through the year 2150. Eight extreme precipitation scenarios are analyzed, combining four return periods (T25, T50, T100, T200) with medium and high climate projections.
The adaptation need of Voerendaal East is defined as the runoff volume that exceeds a water depth threshold of 0.25 m within a two‑hour period at street level at the critical adaptation point. This point represents the location along the main runoff streamline where the maximum water depth occurs within the area of impact, which is the part of the catchment from which runoff converges toward the built‑up area. Results show that the adaptation need reaches up to 70,000 m³ for T200H in 2150, while remaining negligible for T25M.
To meet the adaptation need, seven hydrologically effective measures are identified: buffer optimization, new buffer location, temporary barrier at home, temporary barrier highway, diversion, stream optimization, and infiltration. Diversion provides the highest effectiveness (80,000 m³), while temporary measures are the most cost-efficient. Infiltration and diversion are the most expensive, where the infiltration measure requires a large land surface of 400,000 m2. Despite its large costs, the infiltration measure strengthens the landscape elements of South Limburg. The temporary measures and stream optimization require no land surface.
With these seven measures, 25 pathways are developed and evaluated from the perspectives of cost minimization, land minimization, avoidance of temporary measures, avoidance of temporary barriers at home, flexibility (choice and order of measures) and landscape integration. Buffer optimization emerges as the no-regret measure due to its favorable balance of cost, hydrological effectiveness and land requirement. Therefore, this measure serves as the first step in all pathways, except for the diversion pathway. It is assumed that responsibility for the initial measure of the pathways is not placed directly on citizens, but initially lies with the Limburg Water Authority.
The findings show that, overall, the flexible pathways outperform the rigid (diversion) pathway by reducing both overinvestment and land requirements. However, when the infiltration measure is applied, the rigid pathway becomes cheaper in terms of both cost and land use. ...
The adaptation need of Voerendaal East is defined as the runoff volume that exceeds a water depth threshold of 0.25 m within a two‑hour period at street level at the critical adaptation point. This point represents the location along the main runoff streamline where the maximum water depth occurs within the area of impact, which is the part of the catchment from which runoff converges toward the built‑up area. Results show that the adaptation need reaches up to 70,000 m³ for T200H in 2150, while remaining negligible for T25M.
To meet the adaptation need, seven hydrologically effective measures are identified: buffer optimization, new buffer location, temporary barrier at home, temporary barrier highway, diversion, stream optimization, and infiltration. Diversion provides the highest effectiveness (80,000 m³), while temporary measures are the most cost-efficient. Infiltration and diversion are the most expensive, where the infiltration measure requires a large land surface of 400,000 m2. Despite its large costs, the infiltration measure strengthens the landscape elements of South Limburg. The temporary measures and stream optimization require no land surface.
With these seven measures, 25 pathways are developed and evaluated from the perspectives of cost minimization, land minimization, avoidance of temporary measures, avoidance of temporary barriers at home, flexibility (choice and order of measures) and landscape integration. Buffer optimization emerges as the no-regret measure due to its favorable balance of cost, hydrological effectiveness and land requirement. Therefore, this measure serves as the first step in all pathways, except for the diversion pathway. It is assumed that responsibility for the initial measure of the pathways is not placed directly on citizens, but initially lies with the Limburg Water Authority.
The findings show that, overall, the flexible pathways outperform the rigid (diversion) pathway by reducing both overinvestment and land requirements. However, when the infiltration measure is applied, the rigid pathway becomes cheaper in terms of both cost and land use. ...
Climate change is expected to intensify extreme precipitation events, creating deep uncertainty for long‑term flood risk management in Voerendaal East. This flood‑prone area is located in the hilly landscape of South Limburg in the Netherlands. To address this uncertainty, this research develops adaptation pathways to manage extreme precipitation through the year 2150. Eight extreme precipitation scenarios are analyzed, combining four return periods (T25, T50, T100, T200) with medium and high climate projections.
The adaptation need of Voerendaal East is defined as the runoff volume that exceeds a water depth threshold of 0.25 m within a two‑hour period at street level at the critical adaptation point. This point represents the location along the main runoff streamline where the maximum water depth occurs within the area of impact, which is the part of the catchment from which runoff converges toward the built‑up area. Results show that the adaptation need reaches up to 70,000 m³ for T200H in 2150, while remaining negligible for T25M.
To meet the adaptation need, seven hydrologically effective measures are identified: buffer optimization, new buffer location, temporary barrier at home, temporary barrier highway, diversion, stream optimization, and infiltration. Diversion provides the highest effectiveness (80,000 m³), while temporary measures are the most cost-efficient. Infiltration and diversion are the most expensive, where the infiltration measure requires a large land surface of 400,000 m2. Despite its large costs, the infiltration measure strengthens the landscape elements of South Limburg. The temporary measures and stream optimization require no land surface.
With these seven measures, 25 pathways are developed and evaluated from the perspectives of cost minimization, land minimization, avoidance of temporary measures, avoidance of temporary barriers at home, flexibility (choice and order of measures) and landscape integration. Buffer optimization emerges as the no-regret measure due to its favorable balance of cost, hydrological effectiveness and land requirement. Therefore, this measure serves as the first step in all pathways, except for the diversion pathway. It is assumed that responsibility for the initial measure of the pathways is not placed directly on citizens, but initially lies with the Limburg Water Authority.
The findings show that, overall, the flexible pathways outperform the rigid (diversion) pathway by reducing both overinvestment and land requirements. However, when the infiltration measure is applied, the rigid pathway becomes cheaper in terms of both cost and land use.
The adaptation need of Voerendaal East is defined as the runoff volume that exceeds a water depth threshold of 0.25 m within a two‑hour period at street level at the critical adaptation point. This point represents the location along the main runoff streamline where the maximum water depth occurs within the area of impact, which is the part of the catchment from which runoff converges toward the built‑up area. Results show that the adaptation need reaches up to 70,000 m³ for T200H in 2150, while remaining negligible for T25M.
To meet the adaptation need, seven hydrologically effective measures are identified: buffer optimization, new buffer location, temporary barrier at home, temporary barrier highway, diversion, stream optimization, and infiltration. Diversion provides the highest effectiveness (80,000 m³), while temporary measures are the most cost-efficient. Infiltration and diversion are the most expensive, where the infiltration measure requires a large land surface of 400,000 m2. Despite its large costs, the infiltration measure strengthens the landscape elements of South Limburg. The temporary measures and stream optimization require no land surface.
With these seven measures, 25 pathways are developed and evaluated from the perspectives of cost minimization, land minimization, avoidance of temporary measures, avoidance of temporary barriers at home, flexibility (choice and order of measures) and landscape integration. Buffer optimization emerges as the no-regret measure due to its favorable balance of cost, hydrological effectiveness and land requirement. Therefore, this measure serves as the first step in all pathways, except for the diversion pathway. It is assumed that responsibility for the initial measure of the pathways is not placed directly on citizens, but initially lies with the Limburg Water Authority.
The findings show that, overall, the flexible pathways outperform the rigid (diversion) pathway by reducing both overinvestment and land requirements. However, when the infiltration measure is applied, the rigid pathway becomes cheaper in terms of both cost and land use.
Delft Meet Regen
Onderzoek naar de dagelijkse neerslagspreiding in Delft op basis van de neerslagdata van Delft Meet Regen
In dit rapport zal er onderzocht worden wat de dagelijkse ruimtelijke spreiding van regen in Delft is op basis van de neerslagdata van het Delft Meet Regen project. In totaal hebben er 90 vrijwilligers meegedaan aan dit project en zijn er dus ook 90 meetpunten. De neerslagdata die gebruikt is voor dit onderzoek is de neerslagdata in de periode van 1 augustus 2021 tot en met 17 september 2021. De neerslagdata is vervolgens vergeleken met de data van KNMI station 449, door de dagelijkse gemiddelden normaal en cumulatief met elkaar te vergelijken. De KNMI data heeft een goede overeenkomst met de neerslagdata van het Delft Meet Regen project.
Hierna is het onderzoeksgebied ingedeeld in de volgende vier gebieden: noordwest, noordoost, zuidwest en zuidoost. Van deze gebieden zijn de dagelijkse gemiddelden, aantal metingen, standaard afwijkingen en de dagelijkse gemiddelden cumulatief met elkaar vergeleken. Dit is gedaan doormiddel van grafieken, staafdiagrammen en ruimtelijke plots. Hieruit is geconcludeerd dat er sprake is van gemiddelde dagelijkse neerslagverschillen tussen de gebieden, maar dat er geen sprake is van een patroon. Het aantal metingen per gebied verschilt per dag en dit heeft invloed op de nauwkeurigheid van de resultaten. Hoe meer metingen er beschikbaar zijn, hoe nauwkeuriger de resultaten zullen zijn... ...
Hierna is het onderzoeksgebied ingedeeld in de volgende vier gebieden: noordwest, noordoost, zuidwest en zuidoost. Van deze gebieden zijn de dagelijkse gemiddelden, aantal metingen, standaard afwijkingen en de dagelijkse gemiddelden cumulatief met elkaar vergeleken. Dit is gedaan doormiddel van grafieken, staafdiagrammen en ruimtelijke plots. Hieruit is geconcludeerd dat er sprake is van gemiddelde dagelijkse neerslagverschillen tussen de gebieden, maar dat er geen sprake is van een patroon. Het aantal metingen per gebied verschilt per dag en dit heeft invloed op de nauwkeurigheid van de resultaten. Hoe meer metingen er beschikbaar zijn, hoe nauwkeuriger de resultaten zullen zijn... ...
In dit rapport zal er onderzocht worden wat de dagelijkse ruimtelijke spreiding van regen in Delft is op basis van de neerslagdata van het Delft Meet Regen project. In totaal hebben er 90 vrijwilligers meegedaan aan dit project en zijn er dus ook 90 meetpunten. De neerslagdata die gebruikt is voor dit onderzoek is de neerslagdata in de periode van 1 augustus 2021 tot en met 17 september 2021. De neerslagdata is vervolgens vergeleken met de data van KNMI station 449, door de dagelijkse gemiddelden normaal en cumulatief met elkaar te vergelijken. De KNMI data heeft een goede overeenkomst met de neerslagdata van het Delft Meet Regen project.
Hierna is het onderzoeksgebied ingedeeld in de volgende vier gebieden: noordwest, noordoost, zuidwest en zuidoost. Van deze gebieden zijn de dagelijkse gemiddelden, aantal metingen, standaard afwijkingen en de dagelijkse gemiddelden cumulatief met elkaar vergeleken. Dit is gedaan doormiddel van grafieken, staafdiagrammen en ruimtelijke plots. Hieruit is geconcludeerd dat er sprake is van gemiddelde dagelijkse neerslagverschillen tussen de gebieden, maar dat er geen sprake is van een patroon. Het aantal metingen per gebied verschilt per dag en dit heeft invloed op de nauwkeurigheid van de resultaten. Hoe meer metingen er beschikbaar zijn, hoe nauwkeuriger de resultaten zullen zijn...
Hierna is het onderzoeksgebied ingedeeld in de volgende vier gebieden: noordwest, noordoost, zuidwest en zuidoost. Van deze gebieden zijn de dagelijkse gemiddelden, aantal metingen, standaard afwijkingen en de dagelijkse gemiddelden cumulatief met elkaar vergeleken. Dit is gedaan doormiddel van grafieken, staafdiagrammen en ruimtelijke plots. Hieruit is geconcludeerd dat er sprake is van gemiddelde dagelijkse neerslagverschillen tussen de gebieden, maar dat er geen sprake is van een patroon. Het aantal metingen per gebied verschilt per dag en dit heeft invloed op de nauwkeurigheid van de resultaten. Hoe meer metingen er beschikbaar zijn, hoe nauwkeuriger de resultaten zullen zijn...