Modeling land use change impacts on hydrology and the use of landscape metrics as tools for watershed management: The case of an ungauged catchment in the Philippines
Modeling land use change impacts on hydrology and the use of landscape metrics as tools for watershed management: The case of an ungauged catchment in the Philippines
复制标题
DOI：
10.1016/j.landusepol.2017.12.042
复制
发表时间：
2018-03-01
期刊：
影响因子：
7.1
通讯作者：
Lansigan, Felino P.
中科院分区：
文献类型：
--
作者：
Boongaling, Cheamson Garret K.;Faustino-Eslava, Decibel V.;Lansigan, Felino P.
研究了菲律宾八打雁无资料卡伦邦流域土地利用/土地覆盖变化的影响以及景观格局与水文过程的关系。从2003年到2008年，LULC的变化包括建筑面积的增加（69%）和包括河岸植被在内的混合植被的减少（-10%），这对水文有重大影响。使用土壤和水评估工具，地表径流量（5%）和沉积物产量（6%）显著增加，基流减少（-11%）。观察到的影响的空间和时间变化：退化的子流域经历了增加流量（高达31%），在暴风雨的月份和减少基流（高达-26%），在干旱的月份。相比之下，改善的子流域在干旱月份减少了暴雨流量（高达-4%），并增加了基流（高达5%）。九景观指标已知影响水文量化使用Fragstats和地表径流，基流和产沙量使用偏最小二乘（PLS）回归。结果表明，增加农业景观和森林景观的斑块密度和最大斑块指数，会导致地表径流量和产沙量减少，而基流增加。相比之下，农业和森林景观的凝聚力和聚集指数分别增加，会导致地表径流和产沙量随着基流的减少而增加。虽然需要更多的观测数据进行验证，但本研究中产生的关系模型可以应用于新数据或用于情景分析。该模式与经济、社会和政治评估相结合，可成为制定综合流域管理和土地使用政策的有用工具。
The impacts of land use/land cover (LULC) change and the relationship between landscape pattern and hydrologic processes in the ungauged Calumpang watershed, Batangas, Philippines were studied. LULC change from 2003 to 2008 included an increase in built-up areas (69%) and a reduction of mixed vegetation including riparian vegetation (-10%), which have significant effects on hydrology. Using the Soil and Water Assessment Tool (SWAT), significant increases in surface runoff (5%) and sediment yield (6%) and a reduction in baseflow (-11%) were shown. Spatial and temporal variations of the impacts were observed: degraded sub-basins experienced increased streamflow (up to 31%) during stormy months and reduced baseflow (up to -26%) during dry months. In contrast, improved sub-basins decreased stormflow (up to -4%), and increased baseflow (up to 5%) during dry months. Nine landscape metrics known to affect hydrology were quantified using Fragstats and were correlated with surface runoff, basefiow and sediment yield using partial least square (PLS) regression. The results indicated that increasing patch density and largest patch index of agricultural and forested landscapes, respectively, leads to a decrease in surface runoff and sediment yield while increasing baseflow. In contrast, increasing cohesion and aggregation index of agricultural and forested landscapes, respectively, results to an increase in surface runoff and sediment yield as baseflow decreases. Although more observed data is needed for validation, the relationship model produced in this study can be applied to new data or used for scenario analysis. When coupled with economic, social and political assessments, the model serves as a useful tool in formulating comprehensive watershed management and land use policies.