Description

The Júcar River Basin case study is located in eastern Spain. The Júcar River flows 497 Km between the Montes Universales range and the Mediterranean Sea. Its main features are its Mediterranean character (flood events during autumn combined with low flows during summer), the existence of recurrent and severe drought periods and the development of different management strategies (e.g. conjunctive use, drought management plan) to cope with water scarcity periods.

The Júcar River Basin Authority (CHJ) manages the water resources, allocating it among urban (Valencia, Albacete and Sagunto cities), agricultural (USUJ, Jucar-Turia Canal and JCRMO users association) and industrial (Iberdrola power company) users. Other stakeholders include NGOs and authorities (national, regional and local).

This case study was important for IMPREX due to the high degree of cooperation between the existing authorities for drought management, which was an example of how stakeholder involvement can make a difference in water resources management.

IMPREX evaluated how improved forecasting of hydrological extremes was able to increase the efficiency of the water system operation against drought events, considering hydropower and agriculture. In addition, participatory modelling approaches were employed to integrate improved forecasting systems into decision-making processes.

The lessons learnt from this case study in terms of stakeholder involvement, cooperation, and integration of forecasting of extreme events in decision-making can be exported to other European river basins in order to solve future challenges.

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Outcome

This case study defined a way to improve the inflow forecasting mechanisms currently used and applied them in real-life operation.

Those mechanisms defined, improved and evaluated while testing their impact in the hydropower production (Work Package 8: Hydropower) and the drought management (Work Package 11: Agriculture and droughts) of the water system. Their implementation in real-life operation was explored using participatory approaches, stakeholder involvement, co-development and system dynamics modelling.

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Tools and models

The models developed for the Júcar River Basin were the following:

  • Hydrological models: to obtain basin discharges based on meteorological variables obtained by the IMPREX WP3 (Improved meteorologial predictability and climate scenarios).
  • Autoregressive models: to estimate future inflows based on current and/or past discharge values obtained using historical records, outputs from our own hydrological models or the outputs of the IMPREX WP4 (Improved predictability of hydrological extremes). They were used to define different inflow scenarios at short-, medium- and long-term. They were created using MASHWIN module from AQUATOOL DSS.
  • Júcar River system simulation models: they determined how water should be allocated, based on the inflow values previously defined using our own hydrological models or the outputs from the IMPREX Work Package 4, in response to pre-defined operating rules. Those models were built using SIMGES modules from AQUATOOL DSS.
  • Júcar River system optimisation models: they prescribed how water should be allocated considering an optimisation criterion (e.g. demand deficit minimisation, economic benefits maximisation, etc.), based on the inflow data determined by our own hydrological models or the outputs of the IMPREX Work Package 4. Stochastic optimisation models were employed. The stochastic optimisation was based on stochastic programming (SDP), stochastic dual dynamic programming (SDDP) and sampling stochastic programming (SSDP). Stochastic optimisation models were created using the GAMS programming language.
  • Júcar River system dynamics models: they determined how the different components of the system interact between them. They were created using the Vensim tool.
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FUTURE IMPLICATIONS

The results can be integrated in the River Basin Hydrological Plan and the Drought Management Plans if the seasonal forecast is good enough to reduce the uncertainty existing in the current management tools (where dynamic seasonal forecasts are not used). Currently, the results haven’t been convincing enough for it to be implemented in decision-making as it may introduce a new source of uncertainty in the currently used methodologies for drought planning and management.

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More information:

The Júcar River Basin Case Study: a challenge for today, a challenge for tomorrow

Hector Macian-Sorribes; Maria Pedro-Monzonis; Andrea Momblanch; Javier Paredes-Arquiola; Manuel Pulido-Velazquez; Abel Solera; Joaquin Andreu

Poster_UPV_Rotterdam
The Júcar river basin case study: a challenge for today, a challenge for tomorrow. Poster presented by the Universitat Politècnica de València (UPV) team at the stand of the IMPREX project in the Adaptation Futures 2016 Conference in Rotterdam (The Netherlands). 

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Photos courtesy of Jaime Gaona and David Haro