Abstract：
Agricultural lands are often impacted by flooding, which results in economic losses and causes food insecurity across the world. Due to the world\'s growing population, land-use alteration is frequently practiced meeting global demand. However, land-use changes combined with climate change have resulted in extreme hydrological changes (i.e., flooding and drought) in many areas. The state of Iowa has experienced several flooding events over the last couple of decades (e.g., 1993, 2008, 2014, 2016, 2019). Also, agribusiness is conducted across 85% of the state. In this research, we present a comprehensive assessment for agricultural flood risk in the state of Iowa utilizing most up-to-date flood inundation maps and crop layer raster datasets. The study analyzes the seasonal variation of the statewide agricultural flood risk by focusing on corn, soybean, and alfalfa crops. The results show that over $230 million average annualized losses estimated at statewide considering studied crop types. The crop frequency layers and corn suitability rating datasets are investigated to reveal regions with lower or higher productivity ratings. The study founds nearly half a million acres of cropland is under 2-year return period flood zone. Additionally, a data-driven flood model, Height Above the Nearest Drainage (HAND), is used to analyze performance against the FEMA maps. We found that the HAND flood maps performed with the correlation of 0.93 and 0.94 for 100-year and 500-year flood events regarding to the FEMA maps.
摘要：
农业用地经常受到洪水的影响，这导致经济损失，并导致世界各地的粮食不安全。由于世界人口的增长,土地利用改变经常被用来满足全球需求。然而,土地利用变化与气候变化相结合导致了极端的水文变化(即，洪水和干旱)在许多地区。在过去的几十年里，爱荷华州经历了几次洪水事件(例如，1993、2008、2014、2016、2019)。此外，农业综合企业在该州85%的地区进行。在这项研究中,我们利用最新的洪水淹没图和作物层栅格数据集对爱荷华州的农业洪水风险进行了全面评估。该研究以玉米为重点，分析了全州农业洪水风险的季节性变化。大豆,和苜蓿作物。结果表明，考虑到研究的作物类型，全州估计的平均年化损失超过2.3亿美元。研究了作物频率层和玉米适宜性等级数据集，以揭示生产率等级较低或较高的地区。研究发现，近50万英亩的农田处于2年重现期洪水带之下。此外,数据驱动的洪水模型，高于最近排水的高度（HAND），用于根据FEMA地图分析性能。我们发现，与FEMA地图有关的100年和500年洪水事件的HAND洪水地图的相关性为0.93和0.94。
