PENGEMBANGAN MODEL ANALISIS SPASIAL UNTUK MENSIMULASIKAN RESPON HIDROLOGI

Urban expansion is a major driving force altering local and regional hydrology. To explore these environmental consequences of urbanization this research would like to forecast the land-use change and assesses the long-term runoff water through hydrologic modeling. To know the detrimental effects of future disasters, especially drought, flood, and tropical storms, this research provided by a simulation technique, and based on two skenarios. First, simulation with a land-use change skenario. Second, simulation without a land-use change skenario. It provided by some parameters such as characteristics of catchments, land use, contour, river, soil, infiltration, and rainfall intensity. The objective of using different skenario is to know what kind of hydrological responses. Moreover, the outcomes would indicate that land use and climate change would likely be subjected to impacts the tremendous loss of life and damage due to excessive runoff and flooding. This is the primary watershed that affects the greater Jakarta urban zone, which has had increasingly severe flooding annually impacting and displacing hundreds of thousands of people. However, urbanization will considerably increase runoff water. Finally, the results of this research would have significant implications to support decision-makers, academia, and the wider public in preparing urban planning, water resources management, development of better regulations and their effective implementations. The techniques described in this proposed research can be used in other areas.

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Toward a Dualistic Growth? Population Increase and Land-Use Change in Rome, Italy

Land ◽

10.3390/land10070749 ◽

2021 ◽

Vol 10 (7) ◽

pp. 749

Author(s):

Leonardo Bianchini ◽

Gianluca Egidi ◽

Ahmed Alhuseen ◽

Adele Sateriano ◽

Sirio Cividino ◽

...

Keyword(s):

Land Use ◽

Land Use Change ◽

Population Growth ◽

Mediterranean Basin ◽

Urban Expansion ◽

Arable Land ◽

Central Italy ◽

Agricultural Landscapes ◽

Population Increase ◽

Per Capita

The spatial mismatch between population growth and settlement expansion is at the base of current models of urban growth. Empirical evidence is increasingly required to inform planning measures promoting urban containment in the context of a stable (or declining) population. In these regards, per-capita indicators of land-use change can be adopted with the aim at evaluating long-term sustainability of urbanization processes. The present study assesses spatial variations in per-capita indicators of land-use change in Rome, Central Italy, at five years (1949, 1974, 1999, 2008, and 2016) with the final objective of quantifying the mismatch between urban expansion and population growth. Originally specialized in agricultural productions, Rome’s metropolitan area is a paradigmatic example of dispersed urban expansion in the Mediterranean basin. By considering multiple land-use dynamics, per-capita indicators of landscape change delineated three distinctive waves of growth corresponding with urbanization, suburbanization, and a more mixed stage with counter-urbanization and re-urbanization impulses. By reflecting different socioeconomic contexts on a local scale, urban fabric and forests were identified as the ‘winner’ classes, expanding homogeneously over time at the expense of cropland. Agricultural landscapes experienced a more heterogeneous trend with arable land and pastures declining systematically and more fragmented land classes (e.g., vineyards and olive groves) displaying stable (or slightly increasing) trends. The continuous reduction of per-capita surface area of cropland that’s supports a reduced production base, which is now insufficient to satisfy the rising demand for fresh food at the metropolitan scale, indicates the unsustainability of the current development in Rome and more generally in the whole Mediterranean basin, a region specialized traditionally in (proximity) agricultural productions.

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CH4and N2O fluxes in the Colorado shortgrass steppe: 2. Long-term impact of land use change

Global Biogeochemical Cycles ◽

10.1029/96gb03612 ◽

1997 ◽

Vol 11 (1) ◽

pp. 29-42 ◽

Cited By ~ 97

Author(s):

A. R. Mosier ◽

W. J. Parton ◽

D. W. Valentine ◽

D. S. Ojima ◽

D. S. Schimel ◽

...

Keyword(s):

Land Use ◽

Land Use Change ◽

Shortgrass Steppe ◽

N2o Fluxes ◽

Long Term Impact

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Current and Future Land Use Characters of a National Central City in Eco-Fragile Region—A Case Study in Xi’an City Based on FLUS Model

Land ◽

10.3390/land10030286 ◽

2021 ◽

Vol 10 (3) ◽

pp. 286

Author(s):

Dingrao Feng ◽

Wenkai Bao ◽

Meichen Fu ◽

Min Zhang ◽

Yiyu Sun

Keyword(s):

Land Use ◽

Land Use Change ◽

Urban Development ◽

Urban Expansion ◽

Land Use Patterns ◽

Use Patterns ◽

Pattern Change ◽

Land Use Dynamics ◽

The Future ◽

Xi’An City

Land use change plays a key role in terrestrial systems and drives the process of ecological pattern change. It is important to investigate the process of land use change, predict land use patterns, and reveal the characteristics of land use dynamics. In this study, we adopted the Markov model and future land use (FLUS) model to predict the future land use conditions in Xi’an city. Furthermore, we investigated the characteristics of land use change from a novel perspective, i.e., via establishment of a complex network model. This model captured the characteristics of the land use system during different periods. The results indicated that urban expansion and cropland loss played an important role in land use pattern change. The future gravity center of urban development moved along the opposite direction to that from 2000 to 2015 in Xi’an city. Although the rate of urban expansion declined in the future, urban expansion remained the primary driver of land use change. The primary urban development directions were east-southeast (ENE), north-northeast (NNE) and west-southwest (WSW) from 1990 to 2000, 2000 to 2015, and 2015 to 2030, respectively. In fact, cropland played a vital role in land use dynamics regarding all land use types, and the stability of the land use system decreased in the future. Our study provides future land use patterns and a novel perspective to better understand land use change.

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The Effects of Long‐Term Land‐Use Change on Soil Properties in Perth, Ontario Canada

Inquiry@Queen's Undergraduate Research Conference Proceedings ◽

10.24908/iqurcp.8271 ◽

2016 ◽

Author(s):

Trina Stephens

Keyword(s):

Land Use ◽

Organic Matter ◽

North America ◽

Land Use Change ◽

Soil Properties ◽

Carbon Storage ◽

Organic Matter Content ◽

Matter Content ◽

Topographic Gradients

Land‐use change can have a major impact on soil properties, leading to long‐term changes in soilnutrient cycling rates and carbon storage. While a substantial amount of research has been conducted onland‐use change in tropical regions, empirical evidence of long‐term conversion of forested land toagricultural land in North America is lacking. Pervasive deforestation for the sake of agriculturethroughout much of North America is likely to have modified soil properties, with implications for theglobal climate. Here, we examined the response of physical, chemical and biological soil properties toconversion of forest to agricultural land (100 years ago) on Roebuck Farm near Perth, Ontario, Canada.Soil samples were collected at three sites from under forest and agricultural vegetative cover on bothhigh‐ and low‐lying topographic positions (12 locations in total; soil profile sampled to a depth of 40cm).Our results revealed that bulk density, pH, and nitrate concentrations were all higher in soils collectedfrom cultivate sites. In contrast, samples from forested sites exhibited greater water‐holding capacity,porosity, organic matter content, ammonia concentrations and cation exchange capacity. Many of these characteristics are linked to greater organic matter abundance and diversity in soils under forestvegetation as compared with agricultural soils. Microbial activity and Q10 values were also higher in theforest soils. While soil properties in the forest were fairly similar across topographic gradients, low‐lyingpositions under agricultural regions had higher bulk density and organic matter content than upslopepositions, suggesting significant movement of material along topographic gradients. Differences in soilproperties are attributed largely to increased compaction and loss of organic matter inputs in theagricultural system. Our results suggest that the conversion of forested land cover to agriculture landcover reduces soil quality and carbon storage, alters long‐term site productivity, and contributes toincreased atmospheric carbon dioxide concentrations.

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Response of phosphorus fractions to land-use change followed by long-term fertilization in a sub-alpine humid soil of Qinghai–Tibet plateau

Journal of Soils and Sediments ◽

10.1007/s11368-018-2132-y ◽

2018 ◽

Vol 19 (3) ◽

pp. 1109-1119 ◽

Cited By ~ 2

Author(s):

Xiaolei Sun ◽

Meng Li ◽

Guoxi Wang ◽

Marios Drosos ◽

Fulai Liu ◽

...

Keyword(s):

Land Use ◽

Land Use Change ◽

Phosphorus Fractions ◽

Tibet Plateau ◽

Qinghai Tibet Plateau

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Warming increases carbon and nutrient fluxes from sediments in streams across land use

Biogeosciences ◽

10.5194/bg-10-1193-2013 ◽

2013 ◽

Vol 10 (2) ◽

pp. 1193-1207 ◽

Cited By ~ 24

Author(s):

S.-W. Duan ◽

S. S. Kaushal

Keyword(s):

Land Use ◽

Organic Matter ◽

Land Use Change ◽

Sulfate Reduction ◽

Organic Matter Content ◽

Soluble Reactive Phosphorus ◽

Overlying Water ◽

Sediment Fluxes ◽

Urban Sites

Abstract. Rising water temperatures due to climate and land use change can accelerate biogeochemical fluxes from sediments to streams. We investigated impacts of increased streamwater temperatures on sediment fluxes of dissolved organic carbon (DOC), nitrate, soluble reactive phosphorus (SRP) and sulfate. Experiments were conducted at 8 long-term monitoring sites across land use (forest, agricultural, suburban, and urban) at the Baltimore Ecosystem Study Long-Term Ecological Research (LTER) site in the Chesapeake Bay watershed. Over 20 yr of routine water temperature data showed substantial variation across seasons and years. Lab incubations of sediment and overlying water were conducted at 4 temperatures (4 °C, 15 °C, 25 °C, and 35 °C) for 48 h. Results indicated: (1) warming significantly increased sediment DOC fluxes to overlying water across land use but decreased DOC quality via increases in the humic-like to protein-like fractions, (2) warming consistently increased SRP fluxes from sediments to overlying water across land use, (3) warming increased sulfate fluxes from sediments to overlying water at rural/suburban sites but decreased sulfate fluxes at some urban sites likely due to sulfate reduction, and (4) nitrate fluxes showed an increasing trend with temperature at some forest and urban sites but with larger variability than SRP. Sediment fluxes of nitrate, SRP and sulfate were strongly related to watershed urbanization and organic matter content. Using relationships of sediment fluxes with temperature, we estimate a 5 °C warming would increase mean sediment fluxes of SRP, DOC and nitrate-N across streams by 0.27–1.37 g m−2 yr−1, 0.03–0.14 kg m−2 yr−1, and 0.001–0.06 kg m−2 yr−1. Understanding warming impacts on coupled biogeochemical cycles in streams (e.g., organic matter mineralization, P sorption, nitrification, denitrification, and sulfate reduction) is critical for forecasting shifts in carbon and nutrient loads in response to interactive impacts of climate and land use change.

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