Characterization of precipitation and river water chemistry for measuring rates of weathering and soil formation in Iu river watershed, southwestern Japan

Rasyidin, Azwar; Wakatsuki, Toshiyuki

doi:10.1080/00380768.1994.10413306

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…In general, the amount of water flowing in a watershed is the amount of rainfall (mm) multiplied by the catchment area (ha) multiplied by the area factor divided by the unit of time [2] . The area factor is 1 -0.65.…”

Section: Introductionmentioning

confidence: 99%

Hydrology Balance in Sustainable Land Development

Rasyidin

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Several cities in West Sumatra are in an alluvial system formation even though they are at an altitude above 350 m msl, for example, Kota Solok 350 m, Bukittinggi 900 m, and Padang 25 m msl. The growth of this city was initially safe from floods, but lately, it has often experienced flood disasters or disturbed the hydrological balance. This is presumably due to changes in land use. The city of Solok has lost 385 ha of rice fields so far, the city of Padang has lost 35 ha of rice fields/year, and Bukittinggi has lost nearly 200 ha of its total rice field area. When there is a land use change to a settlement, the amount of water required during rice cultivation becomes water that has to be disposed of, and this should affect the expansion of the drainage channel. If the water requirement for one growing season is at a value of 1,300 mm, with a length of time from soil processing to harvesting is 4 months, meaning that every month the rice fields need water as much as 1,251,250 m3, which is equivalent to 0.48m3/sec.

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Section: Introductionmentioning

confidence: 99%

Hydrology Balance in Sustainable Land Development

Rasyidin

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…Erosion is a main factor affecting degradation of soils in the world. In Indonesia, soil erosion due to water seems to be the most found problem in agricultural land, especially in West Sumatra Province receiving a lot of rainfall each year (up to 6500 mm/y) [1]. Erosion is used to increase by increasing slope level within the same land use.…”

Section: Introductionmentioning

confidence: 99%

Role of coffee plantation in reducing erosion under coarse textured soil in wet tropical region

Yulnafatmawita

Maira

Gusmini

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Water erosion is one phenomenon causing land degradation in a wet area. The research was aimed to evaluate the total of soil erosion under coffee plantations having coarse textured soil in wet tropical regions. This research was taken out on a coffee plantation in Sibarasok, Maninjau having rather to very steep slope and high annual rainfall, with Inceptisol soil order. Soil samples were taken from 6 land units (Coffee-86 y having 0-8%, 25-45%, and >45%, Coffee 5 y-15-25%, Coffee 8 y-25-45%, and forest >45% as control). The samples of soil were prepared and analyzed in the Laboratory of Soil, Department of Soil Science and Land Resource, Andalas University. The actual amount of soil eroded was predicted using the USLE formula. Then, it was compared to the tolerated (Etol) soil erosion. The result showed that the predicted amount of soil eroded was quite low (<10 T/Ha/y), except under coffee having >45% slope. The highest soil eroded in the very steep slope was due to its low SOM content and permeability, with an erosion hazard level of 1.2. Compared to tolerated erosion (Etol), the actual soil erosion predicted was lower than the Etol. The fiber roots of the coffee dominating the top 5 cm of soil surface as well as high SOM content and hydraulic conductivity rate caused the soil on the top to become tightly held avoiding erosion.

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