8) experience little change in the shape of the monthly hydrograph because there is only occasional low-elevation snow in mid-winter in the twentieth century base case; therefore, there is relatively little sensitivity of monthly runoff timing to warming. Obtain permissions instantly via Rightslink by clicking on the button below: If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. Figures and summary tables for flood statistics and low-flow statistics. Since 2014, the RDI has engaged in applied research related to community climate adaptation. Get the forecast for today, tonight & tomorrow's weather for Guarant do Norte, Mato Grosso, Brazil. The process was also significantly improved by researchers at PCIC who reconfigured and optimized the code to run more efficiently on a Linux cluster (Schnorbus, Bennett, Werner, & Berland, Citation2011). Bias-corrected streamflow values are useful in water planning studies, especially for providing inputs to reservoir operations models that are calibrated on a particular naturalized or modified flow dataset (e.g., Hamlet, Lee, et al., Citation2010b; NWPCC, Citation2005; Vano et al., Citation2010). #! O
One of the first major efforts of CIG in this area was focused on the preparation of a detailed and comprehensive regional assessment report for the PNW for the 1999 National Assessment of the Impacts of Climate Variability and Change in the United States (ultimately published as Mote et al., Citation2003). Although these ongoing research and outreach efforts had already laid an extensive foundation in support of pilot climate services in the PNW, starting in 20062007 it was realized that a much more comprehensive and focused effort to provide hydrologic climate change scenarios was needed if stakeholders and water professionals in the region were to take the next steps in preparing for climate change. Summary information and statistics: geographic location, basin area, calibration statistics (if available), links to the USGS or ECAN websites, and so forth. These extended meteorological data have proved particularly useful in supporting ecological studies (e.g., Littell et al., Citation2010). These spatial variations in the change in AET are broadly reflective of the dominant drivers of AET in each case. Depending on their needs and/or level of technical sophistication, users can tap into the study databases at a number of different levels. This web site provides streamflow information for the Columbia River and coastal drainages in Washington and Oregon State for the 21st century based on a large number of climate scenarios and model experiments. This daily disaggregation technique sometimes introduces an undesirable discontinuity in the bias-corrected daily values at the beginning and end of months. The CBCCSP was founded on the basis of regional partnerships to support a shared need for climate change scenarios and directly encompassed the transboundary nature of the CRB's management framework by including both US and Canadian interests in an integrated and comprehensive data resource. (Citation2010) over the entire PNW (Tohver et al. 5; Yakima River at Parker in Fig. The regional report for the National Assessment was supported by two detailed water management studies focused on the CRB by Hamlet and Lettenmaier (Citation1999b) and Miles, Snover, Hamlet, Callahan and Fluharty (Citation2000). Fine-scale calibration of the model to compensate for such errors, although technically feasible, is of questionable utility, because it essentially ensures that the model is getting something closer to the right answer for the wrong reasons, which in turn has the potential to distort the sensitivity of the model to changing future conditions (Bennett, Werner, & Schnorbus, Citation2012). Produced by, Clean Energy and Green Building Major Projects, Private and public sector clean energy and green building construction projects valued at $15M or more for the 3rd quarter of each year. Instead, these areas respond primarily to projected changes in precipitation until late in the twenty-first century, and in fact some of these areas show modest increases in SWE (about +5%) until the middle of the twenty-first century under the combined effects of warming and increasing cool season precipitation. Observations around the world demonstrate that the global atmosphere has been warming rapidly since the 1970s, with temperatures up an average of 1.7 degrees Fahrenheit in that time and expected to increase between 1 and 4 degrees by the 2030s, Pytlak said. These results point to extensive, landscape-scale transformations in hydrologic behaviour associated with climate change. Originating in British Columbia, it flows 1,214 miles to the Pacific Ocean near Astoria, Oregon. These data are summarized in figures and tables prepared for each streamflow site discussed in Section 4. Building the Columbia Basin-Boundary Region's Capacity to Adapt to Climate Change. Special thanks also to Dennis P. Lettenmaier, head of the Land Surface Hydrology Group at the UW, for providing access to computer resources and system administration support for the CBCCSP. Act relating to state agency climate leadership, S. 5560, 61st Legislature (WA 2009). The same procedure is followed for estimating extreme low flows, except the lowest 7-day flow is extracted for each water year, and 7Q10 (the extreme 7-day low flow with a return interval of 10 years) is estimated. The approach and methods are more fully described in the study report (Hamlet, Carrasco, et al., Citation2010a, Chapter 3) and also by Elsner et al. The scope of work for the project called for hydrologic modellers at CIG to produce the following results: A suite of up-to-date hydrologic projections for the entire CRB (including portions of the basin in Canada) based on the CMIP3/AR4 (Meehl et al., Citation2007) GCM projections. (For example, Dworshak and Milner are nested within the larger Ice Harbor sub-basin.). Inset numbers at the upper left in the future projections are the percentage changes in 1 April SWE averaged over each grid cell in the entire domain. How do I view content?
Differences in the impacts in the US and Canadian portions of the basin are striking, confirming results reported in two previous studies (Hamlet, Citation2003; Hamlet & Lettenmaier, Citation1999b). Retrieved from, Climate change and resource management in the Columbia River Basin. The model shows reasonably good calibration statistics for the majority of the sites, and the calibration is robust (showing equally good or better statistics in the validation period when compared with the calibration period). (Citation2010). The strategy for model calibration used in the CBCCSP was to calibrate 11 relatively large sub-basins within the domain (Fig. A comprehensive assessment of hydrologic extremes such as Q100 and 7Q10. The PET is shown to increase dramatically over most of the domain (primarily because of warming in the scenarios), whereas AET shows widespread declines east of the Cascade Range. In this case only modified flows (2000-level modified flows obtained from the BPA (Crook, Citation1993)) were used to train the bias-correction procedure, even if naturalized flows were also available. To request a reprint or corporate permissions for this article, please click on the relevant link below: Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content? For climate change studies in the western United States where snow is an important element of the hydrologic cycle, the model's use of a sophisticated energy-balance snow model, which incorporates important effects on snow accumulation and melt associated with vegetation canopy (Andreadis, Storck, & Lettenmaier, Citation2009) has been a notable advantage. Detailed forecast for Upper Columbia Basin Tonight Mostly clear. Snover, A. K., Hamlet, A. F., Lee, S.-Y., Mantua, N. J., Salath, E. P. Jr, Steed, R., & Tohver, I. It reaches a thickness estimated at 16,000 feet in places. (Citation2010). Hydrologic climate change scenarios for the Pacific Northwest Columbia River basin and coastal drainages. Hamlet, and S.-Y. The magnitude of hydrologic extremes such as Q100 and 7Q10 are expected to shift markedly in some basins in response to cool season warming, increasing cool season precipitation, and warmer, drier summers. This approach was partly based on practical limitations on time and computational resources but was also informed by previous experience using the VIC model at finer spatial scales. Saturday: Mostly cloudy with a 20 percent chance of rain. The CBCCSP was developed to address these diverse needs. Using the VIC model, Mote, Hamlet, Clark, and Lettenmaier (Citation2005), Mote, Hamlet, and Salath (Citation2008), for example, showed excellent reproduction of observed trends in 1 April SWE over both the PNW as a whole and over the Cascade Range in Oregon and Washington. NWPCC (Northwest Power and Conservation Council). In addition to creating these datasets, the RMJOC agencies worked together to adopt a set of methods for incorporating these data into those longer-term planning activities. In much of the CRB, however, summer AET is water limited (i.e., there is abundant surface energy to evaporate whatever water is available), and changes in AET are dominated by decreasing summer precipitation in the scenarios, which effectively decreases summer AET in most cases. Additional details on the approach and methods are available in the CBCCSP study report (Hamlet, Carrasco, et al., Citation2010a). The bias-corrected monthly values are then used to rescale the simulated daily flow sequences produced by the hydrologic model to produce bias-corrected daily streamflows. Friday Mostly sunny. Confirming the sensitivity to warming demonstrated in earlier studies, the CBCCSP results show widespread reductions in the 1 April snowpack, and systematic reductions in the long-term average SWE2PR, a measure of the importance of snow in the hydrologic cycle (Fig. 3099067 Similarly, three different downscaling approaches were used in the study, each with its own advantages and limitations in the context of different natural resources management applications (Hamlet et al., 2010a). (Citation2010), but the essential idea behind the methods is that monthly gridded data are based only on serially complete and quality-controlled HCN and AHCCD stations (thus ensuring self-consistent long-term trends based on the same group of stations), but daily variations within the month come from re-gridded daily co-op station data, which add additional spatial detail on an event basis at daily time scales (Hamlet & Lettenmaier, Citation2005). Peak flows actually increase at many sites in Canada because of increasing fall, winter, and spring precipitation in this part of the domain, although the peak flow also occurs about a month earlier. Three statistical downscaling approaches were selected or developed for the study: Composite Delta (CD): regional average projections compiled from 10 GCMs (Elsner et al., Citation2010), Bias Correction and Spatial Downscaling (BCSD): (Salath, Citation2005; Salath, Mote, & Wiley, Citation2007; Wood, Leung, Sridhar, & Lettenmaier, Citation2004; Wood, Maurer, Kumar, & Lettenmaier, Citation2002), Hybrid Delta (HD): (Hamlet et al., 2010a). A detailed climate change assessment report was prepared by the CIG for Seattle City Light (Snover et al., Citation2010) based primarily on the CBCCSP database. Hamlet, and S.-Y. Associated shifts in streamflow timing from spring and summer to winter are also evident in basins that currently have significant snow accumulation in winter, whereas rain-dominant basins show minimal shifts in streamflow timing. Les plus fortes augmentations dans les crues sont dans les bassins de pluie et neige mles dont les tempratures actuelles au milieu de l'hiver sont quelques degrs du point de conglation. Lows in the upper 30s to lower 40s. One of the fundamental difficulties with this task was that there was not, at the time, an available database of hydrologic projections that could support such planning, and regulatory agencies such as WDOE did not have the capacity or expertise to produce these resources themselves. The Columbia River is the fourth largest river in North America and the largest river in the Pacific Northwest. Small black dots indicate streamflow sites where naturalized flows were not available. (Citation2010). As noted above, the study also supports planning efforts over a wide range of geographic scales. Click the download link to get the current station data. The choice of the A1B scenario, however, was informed by the authors viewpoint that this scenario is an instructive and plausible scenario reflecting relatively little GHG mitigation until mid-century (similar to A2 until about 2050), followed by more effective GHG mitigation efforts in the second half of the twenty-first century as impacts intensify. This extreme scenario, however, was only run by a few GCMs, which ultimately limits the ability to show consistent ranges of outcomes for each emissions scenario. These techniques remove systematic biases in the simulations of routed streamflow to produce products that closely match the long-term statistics of a natural or modified flow dataset for a particular site. Report of A.G. Crook Company to Bonneville Power Administration, Portland, OR. Building the Columbia Basin-Boundary Region's Capacity to Adapt to Climate Change. Data from the CBCCSP are currently supporting two CIG studies funded by the LCCs and the CSC, including a study of impacts to wetlands in the PNW (funded by the North Pacific LCC and the PNWCSC) and a study assessing climatic and hydrologic extremes and their effects on ecosystems over the western United States (funded by the PNWCSC). For each streamflow location (and its associated contributing basin area), a set of identical products is available on the study web site (CIG, Citation2013b). Thursday Sunny. Contact Carri Hessman Program Manager (208) 378-5106 chessman@usbr.gov Bureau of Reclamation However, some areas west of the Cascade Range and in the northern Rockies show increasing AET. Among its most useful features is the predominantly physical basis of the model, which largely avoids concerns about parameter stationarity in a changing climate. The two time periods also represent very different patterns of decadal climate variability in the historical record, providing a useful test in the context of simulating a changing climate. Northeast wind 5 to 10 mph. For the CD and HD downscaling methods, which construct a 91-year time series for both historical and future time periods, three future time periods were selected: 2020s (20102039), 2040s (20302059), and 2080s (20702099). Model calibration and validation used a split sample approach in which calibration was performed for each of the 11 primary watersheds over a 15-year period (typically water years 19751989) and model validation was performed over a separate 15-year period (typically water years 19601974). Gridded datasets provide full spatial coverage (i.e., all grid cells in the model domain) at monthly time scales, of the key hydroclimatic variables listed in Table 2. Blue lines show the average historical values (19162006) (repeated in each panel). Casola, J. H., Kay, J. E., Snover, A. K., Norheim, R. A., Binder, L. C. W., & the Climate Impacts Group. Temperature and precipitation vary greatly with elevation, but in the central basin January average daily temperatures are between about 25 and 30 F (4 and 1 C), and July averages are mostly between 70 and 75 F (21 and 24 C). These annual peak daily flows are then ranked and assigned a quantile value using an unbiased quantile estimator based on the method of Cunane (Stedinger, Vogel, & Foufoula-Georgiou, Citation1993). 6 Example of a summary plot for extreme high flows (Q20, Q50, Q100, left panels) and extreme low flows (7Q10, right panels) for the Skagit River at Mount Vernon for two emissions scenarios (A1B, B1) and three future time periods (2020s, 2040s, 2080s). Three VIC model calibration parameters described above were varied in the optimization process, and six error metrics were used to define the objective function: squared correlation coefficient (R 2), NSE, the NSE of log-transformed data, annual volume error, mean hydrograph peak difference, RMSE, and number of sign changes in the simulated streamflow errors. Because of a general lack of observed naturalized daily time-step flow for most streamflow sites, daily time step calibration using additional parameters such as the infiltration parameter (bi ) in VIC (Liang et al., Citation1994), or routing parameters (such as the unit hydrograph for each cell) were not attempted during the study. Atmosphere Ocean 51. The CRBs cover an area over 87,000 miles 2, with an estimated volume of 50,000 miles 3, and cover about 36 percent of the state. Additional products such as bias-adjusted inflow sequences for specific reservoir operations models are also included. Uniqueness is also evident by looking at the Columbia River Basin. Based on these substantial differences in hydrologic impacts it is difficult to escape the conclusion that management of water resources in the Canadian portions of the basin will play a crucial role in the ability of US water managers to adapt to more substantial changes in streamflow timing and summer low flows in the United States. The largest increases in flooding are in mixed-rain-and-snow basins whose current mid-winter temperatures are within a few degrees of freezing. Potential evapotranspiration increases over most of the PNW in summer because of rising temperatures; however, actual evapotranspiration is reduced in all but a few areas of the domain because evapotranspiration is mostly water limited in summer, and summer precipitation decreases in the simulations. Blue traces show monthly averages for historical conditions; the pink bands show the range of projected change associated with each scenario and future time period; the red lines show the average of the future ensemble. Highs around 80. Three base flow parameters (Ds max, Ds, Ws) associated with the non-linear baseflow curve from the third soil layer (Liang et al., Citation1994) were used to calibrate the model. Daily streamflow data from the CD and HD downscaling methods are first processed to extract the peak daily flow in each water year of the simulations (91 years). The Columbia River is the fourth largest river in North America. Simulations of floods and extreme low flows increase in intensity for most of the river sites included in the study. Determining surface water availability in Oregon. Calibration of the VIC model was carried out using an automated calibration tool called MOCOM-UA developed by the Land Surface Hydrology group at the UW, following the approach described by Yapo, Gupta, and Sorooshian (Citation1998). The calibrated CBCCSP VIC model was modified by WSU by integrating it with a sophisticated crop model (CropSyst; Stckle, Donatelli, & Nelson, Citation2003) that, among other functions, estimates crop water demand. Right panel: Historical and projected future watershed classification (rain-dominant, transitional (mixed-rain-and-snow), snow-dominant) for 10-digit Hydrologic Unit Code watersheds, based on the long-term mean of the SWE2PR for each watershed. Evidence includes increases in global average air and ocean temperatures, widespread melting of snow and ice, and rising global mean sea level. The SRES A1B and B1 GHG emissions scenarios (Nakienovi et al. Pink bands show the range of nine or ten HD climate change scenarios for B1 and A1B emissions scenarios for three future time periods. The same basic effects are seen in the SWE2PR maps, where snowmelt remains dominant in the northern tip of the CRB even at the end of the twenty-first century, whereas in the US portions of the domain there are widespread transformations of mixed-rain-and-snow river basins to rain-dominant basins and snowmelt-dominant basins to mixed-rain-and-snow basins. The Columbia River basin will see an increase in flooding over the next 50 years as a result of climate change, new modeling from Oregon State University indicates. West-wide studies to support USFS and USFWS needs (including current efforts to include California) will have a budget of less than half this amount, a level of efficiency that would not have been achievable without the CBCCSP pilot effort. Twenty-one daily time-step output variables were archived for the VIC simulations (Table 2). These products are based solely on the CD and HD projections listed in Table 1. Figures and summary tables for long-term average monthly precipitation, monthly average temperature, evapotranspiration, PET4 (Table 2), PET5 (Table 2), total column soil moisture, SWE, combined flow (runoff+baseflow).