Improving Hill Farming: From Maize Monocropping to Alternative Cropping Systems in the Thai Highlands

Lately, the Hill Pond Rice System (HPRS) is being promoted as a form of alternative farming systems in selected northern provinces of Thailand, in which the land conversion is designed to maximize rainwater harvesting in farmland consisting of forest trees, water reservoirs, paddy fields, and high-value crop cultivation to serve environmental and livelihood needs. This study employed the double-hurdle model and the tobit technique to investigate the farm-level factors associated with land conversion from maize monocropping to the HPRS using primary data collected from 253 households in Nan, Chiang Mai, Tak, and Lampang Provinces. It was found that education, farming knowledge, understanding benefits of the HPRS, access to water sources, access to advis, and workforce sharing raised the likelihood and extent of farmland conversion into the HPRS. In contrast, perceived complexity of the HPRS, experiences with negative shocks, and land tenure security lowered the likelihood and extent of land conversion. The findings suggest that on-farm collective action should be promoted to mitigate labor constraints in implementation and that access to equipment should be enhanced through HPRS advisors’ visits.

Integrated Simulation Modeling Approach for Investigating Pore Water Pressure Induced Landslides

Soil pore water pressure analysis is crucial for understanding landslide initiation and prediction. However, field-scale transient pore water pressure measurements are complex. This study investigates the integrated application of simulation models (HYDRUS-2D/3D and GeoStudio–Slope/W) to analyze pore water pressure-induced landslides. The proposed methodology is illustrated and validated using a case study (landslide in India, 2018). Model simulated pore water pressure was correlated with the stability of hillslope, and simulation results were found to be co-aligned with the actual landslide that occurred in 2018. Simulations were carried out for natural and modified hill slope geometry in the study area. The volume of water in the hill slope, temporal and spatial evolution of pore water pressure, and factor of safety were analysed. Results indicated higher stability in natural hillslope (factor of safety of 1.243) compared to modified hill slope (factor of safety of 0.946) despite a higher pore water pressure in the natural hillslope. The study demonstrates the integrated applicability of the physics-based models in analyzing the stability of hill slopes under varying pore water pressure and hill slope geometry and its accuracy in predicting future landslides.

Le Bosquet del Vau un établissement du néolithique final

Summary:The Neolithic site of the Bosquet del Vau is located in the Brabant Province in Belgium. Two different rescue excavations took place on the site both in 2006 and 2007 : the first was subsequent to a housing project of about 110 houses, the latter to the building of the R.E.R. (Express Regional Transportation System).The site was discovered in the 1980 by a group of three teenagers going flint tools hunting all around Waterloo and Braine l’Alleud. Flint tools pertaining to the Late Neolithic and Early Bronze Age were recovered on site as well as some Mesolithic flint tools.The site is located on a small sandy hill and covers 2.5 hectares. Steep slopes surround it to the west and north-west and gentler ones to the northeast and south, an isthmus exists to the east linking it o the plateau.The settlement is protected by a palisade to the east and south, a wide ditch links the palisade to the nearly valley to the west. The western side of the hill has seen its slope artificially steepened as did part of the northern side. No palisade was found on either of those two sides.Part of one house and a complete second one were discovered in 2006 and 2007. They are aligned north to south, 18 meters long and 4.5 meters wide. A narrow ditch houses the post holes, posts are maximum 0.30 m in diameter and spaced evenly. Central posts suggest a two-sloped roof. No hearth was found inside of the first house, the one of the second has yet to be associated with the house.A phosphate map was made in both cases, evidence points to a house divided into three parts, with maybe a cattle area next to the second one.Potsherds recovered in two postholes of the 2007 house fit together and could be dated to the Late Neolithic Period.Flint tools are mostly micro-denticulates though a few polished axes fragments have been discovered as well as arrowheads and a beautifully knapped flint knife.The various types of stones used: from black flintstone to Parisian flintstone and phtanite suggest here again a Late-Neolithic dating.

A case study of land slide in Assam hills

A devastating land slide occurred on the early hours of 24 July, 1999 in the hill slopes close to downtown Guwahati. Widespread rain over the NE region and incessant rains over Guwahati area on 23 and 24 July was main reason for the slide which claimed ten (10) human lives almost instantaneously besides damage to property. The various meteorological and geological factors responsible for the land slide have been examined in this study.

Assessment of the Impact of Urbanization on Geoenvironmental Settings Using Geospatial Techniques: A Study of Panchkula District, Haryana

Urbanization is an unavoidable process of social and economic growth in modern times. However, the speed with which urbanization is taking place produces complex environmental changes. It has affected the surface albedo and roughness of the soil, thereby modulating hydrological and ecological systems, which in turn has affected regional and local climate systems. In developing countries of South Asia, rampant and unplanned urbanization has created a complex system of adverse environmental scenarios. Similar is the case in India. The state of the urban environment across India is degrading so quickly that the long-term sustainability of its cities is endangered. Many metropolitan cities in India are witnessing the harmful impacts of urbanization on their land ecology. In this context, remote sensing and geographic information system (GIS) based assessments provide a comprehensive and effective analysis of the rate and the impact of urbanization. The present study focuses on understanding the spatiotemporal characteristics of urban growth and its implications on the geomorphology of the Panchkula District, Haryana, one of the fastest-growing urban centers in India. The study links the changes in land use/land cover (LULC) with the changing geomorphology of the study area using satellite remote sensing and GIS. The results showed that between 1980 and 2020, agricultural (+73.71%), built-up (+84.66%), and forest (+4.07%) classes of land increased in contrast to that of the fallow land (−76.80%) and riverbed (−50.86%) classes that have decreased in spatial extents. It has been observed that the hill geomorphological class had decreased in the area owing to conversion to industrial and built-up activities. Assessment of the environmental quality of cities involves multiple disciplines that call for a significant amount of scientific evaluation and strong decision making, and the present study shall lay down the baseline analysis of the impact of changing LULC on the geomorphological setup of the selected urban center.

Meridional Circulation of Dust and Gas in the Circumstellar Disk: Delivery of Solids onto the Circumplanetary Region

We carried out 3D dust + gas radiative hydrodynamic simulations of forming planets. We investigated a parameter grid of a Neptune-mass, a Saturn-mass, a Jupiter-mass, and a five-Jupiter-mass planet at 5.2, 30, and 50 au distance from their star. We found that the meridional circulation (Szulágyi et al. 2014; Fung & Chiang 2016) drives a strong vertical flow for the dust as well, hence the dust is not settled in the midplane, even for millimeter-sized grains. The meridional circulation will deliver dust and gas vertically onto the circumplanetary region, efficiently bridging over the gap. The Hill-sphere accretion rates for the dust are ∼10−8–10−10 M Jup yr−1, increasing with planet mass. For the gas component, the gain is 10−6–10−8 M Jup yr−1. The difference between the dust and gas-accretion rates is smaller with decreasing planetary mass. In the vicinity of the planet, the millimeter-sized grains can get trapped easier than the gas, which means the circumplanetary disk might be enriched with solids in comparison to the circumstellar disk. We calculated the local dust-to-gas ratio (DTG) everywhere in the circumstellar disk and identified the altitude above the midplane where the DTG is 1, 0.1, 0.01, and 0.001. The larger the planetary mass, the more the millimeter-sized dust is delivered and a larger fraction of the dust disk is lifted by the planet. The stirring of millimeter-sized dust is negligible for Neptune-mass planets or below, but significant above Saturn-mass planets.