Landscapes & Ecosystems

California’s water infrastructure is set up for flood control, with conveying streamflow to the ocean as efficiently as possible as its primary aim. Capturing and using more stormwater is one key way that Los Angeles County can decrease its dependency on water supplies sourced from hundreds of miles away. In adapting the state’s infrastructure for stormwater capture, storage and use, it is essential to plan carefully for the precipitation extremes of the future, which will become more intense and frequent due to climate change.  Atmospheric rivers—long corridors of water vapor traveling from the Pacific Ocean to California—are responsible for producing heavy precipitation and determining the state’s flood risk. Given this context, it is critical to understand how atmospheric river events will change in a warming world. In this project, researchers quantify projected changes in future precipitation driven by extreme atmospheric rivers in California by combining global climate model (GCM) with regional modeling.  

Los Angeles County has high rates of food insecurity, federal food assistance and chronic diet-related diseases, in part due to lack of access to fresh fruits and vegetables and limited green space and safe outdoor spaces in many communities. Urban agriculture has the potential to improve public health through increased food access and consumption, thus may help address urban food insecurity. However, there is very limited data and documentation of urban agriculture activities (e.g. size, production, crop types) in the County. Recognizing this data gap, this project expanded the current documentation efforts and assessed the production potential focusing on how urban agriculture affects public health by integrating health impact assessment (HIA) methodology, geospatial analysis and policy review. 

Assembly Bill 551 (AB 551), California’s Urban Agricultural Incentive Zones (UAIZ) Act, provides tax incentives to landowners to transform vacant lots into small-scale agricultural plots. Major benefits of implementing AB 551 include:  Reduced number of food deserts across the City of Los Angeles.  Reduced transportation pollution from shipping produce.  Creation of new green spaces in previously vacant lots.  Expansion of local farming coupled with sustainable agriculture technologies.  Thus, the implementation of AB 551 is crucial to ensure the City of L.A. meets its 2025 Sustainable City pLAn outcome to increase urban agriculture sites by 25%. The objective of this project is to research the adoption and implementation methods of other California cities and counties that have already adopted AB 551 to relay this information to LAFPC and to share the best implementation strategies for the City of L.A.

Cities worldwide are reshaping their urban ecosystems to accommodate various effects of climate change, protect and conserve biodiversity, and enhance ecosystem services. Actionable frameworks for urban ecosystems are still emerging, but are well suited to address complex ecological processes and environmental challenges. To identify a series of indicators and data gaps to develop an urban ecosystem health framework for Los Angeles (L.A.) County – Brown collected, measured, and mapped relevant datasets within municipal boundaries in the County. This is the first attempt to develop a comprehensive framework of ecosystem health in L.A. County’s built environment.