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The impact of land use and climate change on surface runoff and groundwater in Cimanuk watershed, Indonesia

机译：土地利用与气候变化对印度尼西亚Cimanuk流域地表径流和地下水的影响

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摘要

The Cimanuk River with a total watershed area of 4010.8 km(2)flowing from the Garut Regency to Indramayu Delta is the longest in West Java Province. However, the cumulative effects of climate change, increased population, and fish farming in the coastal area have continuously pressured the availability of water resources in its watershed. This study was, therefore, aimed to analyze the impact of land use and climate change on surface runoff and groundwater using a SWAT model. This is a physically based semi-distributed hydrological model with various applications, particularly to simulate water balance and watershed management. Daily discharge record for 2005-2008, land use data for 2002-2017, and the simulated climate (1979-2003) and projected climate data (2075-2099) retrieved from MRI-AGCM3.2 20-km by the Meteorological Research Institute of Japan Meteorological Agency were used in this research. The result showed that the calibration and validation of SWAT model have exhibited satisfactory criteria for hydrological simulations. The modeled period showed land use changes caused a general increase in runoff and decline in base flow contribution to annual streamflow. The changes between the current and projected climate exhibited increase inQ(max)/Q(min)ratio in certain years.
机译：Cimanuk河总流域区4010.8 km（2）从地毯丽晶到Indramayu delta流动，是西爪哇省最长的。然而，气候变化，人口增加，沿海地区的养殖和鱼类养殖的累积效应不断迫使流域水资源的可用性。因此，本研究旨在使用SWAT模型分析土地利用和气候变化对表面径流和地下水的影响。这是一种具有各种应用的物理基础的半分布水文模型，特别是模拟水平衡和流域管理。 2005-2008的每日排放记录，2002-2017的土地利用数据，以及从MRI-AGCM3.2检索到20千米的模拟气候（1979-2003）和预计的气候数据（2075-2099）由MAREOROGE研究所日本气象学机构在这项研究中使用。结果表明，SWAT模型的校准和验证表现出用于水文模拟的令人满意的标准。建模时期显示土地利用变化导致径流的一般增加和基础流动贡献下降到年度流流。当前和预计的气候之间的变化显示在某些年份增加（最大）/ Q（min）比率。

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