Effect of land use change on hydrology of forested watersheds

Dogan, Fatma; Karpuzcu, M. Ekrem

doi:10.1002/eco.2367

Cited by 10 publications

(5 citation statements)

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“…In either case, researchers concur that changes in surface runoff and river discharges occur within specific types of vegetation cover cut and/or replaced [36,37]. Therefore, crop selection and management are vital for maintaining stream flow and reducing runoff in Taita Hills.…”

Section: Discussion On the Effects Of Lucc On Wundanyi's Hydrological...mentioning

confidence: 93%

The impact of land use and cover changes on river flows in Wundanyi Catchment of Taita Hills, Kenya (1970–2030)

Obando,

Luwesi,

Akombo

2024

Sustain. Social Dev.

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Taita hills are one of the most important biodiversity hotspots of Kenya but experiencing a high rate of deforestation due conversion of its original forestland to agriculture and settlement during the last century. These landscape dynamics coupled with rainfall fluctuations in these critical ecosystems may significantly affect water resource distribution and food security in Taita Taveta County and its environs. This study aimed to establish the trends of land use/cover change (LUCC) in Wundanyi catchment from 1970 to 2030 and predict their specific and combined effects on surface runoff and stream flow in the same period. The analysis was based on statistical trend analysis and dynamic landscape modeling using both historical and primary data from Wundanyi catchment, and Landsat TM and ETM+ imagery of Taita Hills for 1990, 2000, and 2010. Results show highly variable mean seasonal and annual values of discharge in Wundanyi catchment probably attributed to environmental changes affecting Taita Hills in general and Wundanyi catchment in particular. Compared to 1990, major land use/cover changes in 2010 were featured by the expansion of built-up area (250%), plantation forest (23.7%), broadleaved forest (17.4%), and thicket (15.9%). Was also notable the decrease in woodland (−30.3%), cropland (−21.6%), and shrubland (−0.8%). Dynamic spatial trends by the year 2030 will be evidenced by increased thicket by 0.41% per annum (R2 = 81.6%), and by decreased plantation forests (−0.13%; R2 = 91.3%), woodland (−0.10%; R2 = 77.6%), shrubland (−0.11%; R2 = 85.2%), broadleaved forests (−0.03%; R2 = 56.6%) and cropland (−0.09%; R2 of 84.4). These changes will shape the catchment landscape and influence its hydrology, unless the existing forest and agricultural policy interventions are enforced. Hence, crop diversification, agroforestry, and soil and water conservation structures are recommended to maintain effective control of LUCC on hydrological processes going on in the Wundanyi catchment.

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Section: Discussion On the Effects Of Lucc On Wundanyi's Hydrological...mentioning

confidence: 93%

The impact of land use and cover changes on river flows in Wundanyi Catchment of Taita Hills, Kenya (1970–2030)

Obando,

Luwesi,

Akombo

2024

Sustain. Social Dev.

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“…Past research concurs that alterations in agricultural practices and urbanization have impacted the quantity of groundwater recharge in the watershed [5,8,24,25], and our findings agree with the reasoning stated. Also, the groundwater recharge depends on the rainfall amount and distribution in the watershed [25,50]. High rainfall occurs during the wet season (June-September), and the groundwater recharge considerably increases during this period, as displayed in Figure 7.…”

Section: Groundwater Rechargementioning

confidence: 99%

Assessment of Hydrological Responses to Land Use and Land Cover Changes in Forest-Dominated Watershed Using SWAT Model

Ware,

Chang,

Lee

et al. 2024

Water

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Recognizing how human activities affect hydrological systems is vital for the sustainable preservation and effective management of water resources in the watershed. Hence, this paper focuses on the hydrological response to land use and land cover (LULC) change scenarios in the Anyang watershed, South Korea. We obtained LULC data maps for the years 2000, 2013, and 2022 from the local government, revealing significant changes over the years. Agricultural lands experienced a 6.2% increase from 2000 to 2022, and pastureland expanded by 8.67% over two decades. The SWAT model was utilized to assess the impact of LULC on the hydrological components of the study watershed. Model calibration and validation for each LULC change were carried out using the SWAT-CUP program, considering the recorded streamflow information of the region. An excellent agreement was reached between the simulated and measured streamflow in both the calibration and validation stages under various LULC conditions. The Nash–Sutcliffe model efficiency (NSE), the objective function, demonstrated values of 0.9, 0.89, and 0.89 during the calibration for 2000, 2013, and 2022, respectively, in the LULC scenario, while for the validation, we obtained values of 0.82, 0.78, and 0.80 for 2000, 2013, and 2022, respectively. Our findings indicate that the surface runoff rise contributed much to the water yield increase over the two decades compared to the other components in terms of the water yield, while the contribution of evapotranspiration (ET) to the watershed hydrological cycle declined by 1.66% from 2000 to 2022. The southeastern sub-basin part showed a high groundwater recharge distribution due to agricultural land, rice area, and forest area changes.

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“…Conversion of forest into other land uses can cause changes in watershed hydrology (Demissie 2022;Dogan and Karpuzcu 2022). The decreasing vegetation cover due to such conversion increases the energy of rainwater falling onto the ground and thereby increases surface runoff (Le Bissonnais et al 2018;Chen et al 2020), causing damage on the soil surface.…”

Section: Introductionmentioning

confidence: 99%

Surface runoff in varying forest cover types in Jangkok Watershed, Lombok Island, Indonesia

MARKUM,

RAHMAN

2024

Biodiversitas

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Abstract. Markum, Rahman FA. 2024. Surface runoff in varying forest cover types in Jangkok Watershed, Lombok Island, Indonesia. Biodiversitas 25: 753-761. Forests in the Jangkok Watershed play an important role in controlling ecological functions and hydrological cycles in Lombok Island, West Nusa Tenggara, Indonesia. This research aims to evaluate the amount of surface runoff in the Jangkok Watershed by looking at various types of forest cover, namely Primary Forest (PF), Disturbed Forest (DF), Candlenut Agroforestry (CA), Mahogany Woodlot (MW), Multistrata Agroforestry (MA) and Simple Agroforestry (SA). The research area was located at altitudes between 250-650 meters above sea level with a slope of 7-43%. Data collected on each type of forest cover included: vegetation characteristics, surface runoff, slope and rainfall. The result shows vegetation cover in the studied area varies from moderate to very dense with coverage ranging from 50-90%. The vegetation in PF, DF and MA are characterized by very diverse vegetation, while that in UM, CA and SA it is quite homogeneous. The amount of Surface runoff coefficient varies across forest cover types with PF being the lowest (0.6-1.4%), followed by DF (0.6-1.7%), MA (0.6-1.7%), MW (0.6-2.1%), SA (1.0-2.2%) and CA (1.8-4.3%). Factors that are considered influential in determining the magnitude of surface runoff at the research location are the physical properties of the soil, rainfall intensity, vegetation type, structure and density, and land slope. The findings of this study suggest that more complex vegetation has important role in minimizing surface runoff, highlighting the importance of preserving and protecting this forest type to maintain hydrological function of watershed.

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Effect of land use change on hydrology of forested watersheds

Cited by 10 publications

References 60 publications

The impact of land use and cover changes on river flows in Wundanyi Catchment of Taita Hills, Kenya (1970–2030)

The impact of land use and cover changes on river flows in Wundanyi Catchment of Taita Hills, Kenya (1970–2030)

Assessment of Hydrological Responses to Land Use and Land Cover Changes in Forest-Dominated Watershed Using SWAT Model

Surface runoff in varying forest cover types in Jangkok Watershed, Lombok Island, Indonesia

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